Electrospinning device and system

Abstract

This application relates to the field of electrospinning, and relates to an electrospinning device and system. The device includes a bracket, a first positioning roller shaft, a second positioning roller shaft, a collecting electrode, and a nozzle electrode assembly. The second positioning roller shaft is disposed opposite to the first positioning roller shaft up and down. The second positioning roller shaft and the bracket can rotate around the first positioning roller shaft; the collecting electrode is connected to the bracket and is located on one side of the substrate, and the nozzle electrode assembly is disposed on the other side of the substrate. When the second positioning roller shaft and the first positioning roller shaft transfer a substrate such as non-woven fabric, the substrate can be adjusted to a state perpendicular to the opening direction of the liquid tank. The vertically placed substrate can naturally remain flat without applying a large tension, and at least two rollers can be used, thereby avoiding direct contact between the electrospun fibers and the rollers, solving the problem of fiber sticking to the rollers, and avoiding the problem of tearing the substrate. During the electrospinning process, the angle of the substrate surface can also be adjusted according to the height of the liquid tank, which can improve the collection efficiency of electrospinning and increase the spinning output.

Description

Technical Field

[0001] The present application relates to the field of electrospinning, and more particularly, to an electrospinning device and system. Background Art

[0002] Electrospinning technology is a common method for preparing nanofibers with diameters in the nanometer range, which has advantages such as simple principle and low cost.

[0003] Currently, conventional electrospinning technologies can be divided into two categories: needle electrospinning and needleless electrospinning.

[0004] The structure of needle electrospinning includes one or more syringe barrels filled with electrospinning solution, needles, and a metal collector. The electrospinning solution is continuously pushed by the syringe barrel and forms a Taylor cone at the needle tip under the action of an electric field force, and then is continuously stretched into nanofibers with diameters of 10 - 500 nm, and finally is collected by the charged metal collector to form a nanofiber film. Needle electrospinning has a simple structure and is widely used in laboratories. However, its disadvantages are also obvious: the needle tip is extremely prone to clogging during the electrospinning process, increasing the difficulty of later maintenance and making it difficult for needle electrospinning to be widely applied in industrial production.

[0005] The principle of needleless electrospinning is more applied in production-type electrospinning equipment. The wire, perforated steel plate, or threaded column structures are often used for the wire-out device of needleless electrospinning, and usually, they are arranged vertically up and down with the collection device, that is, the wire-out device is below and the collection device is horizontally placed above the wire-out device, such as Patent CN205821538U and Patent CN210048886U. However, in actual production, this horizontally placed collection device has many drawbacks: for the traditional horizontally arranged collection substrate, a large tension often needs to be applied to keep the substrate fabric flat, so a high-strength substrate is required, otherwise the substrate will be torn, resulting in the inability to electrospin on a substrate with low strength. Similarly, the traditional horizontal electrospinning equipment needs to apply a large tension to keep the base cloth flat, so more rollers are required. The electrospun fiber film needs to contact the roller surface, and with a large applied pressure, the phenomenon of fiber sticking to the roller often occurs. Summary of the Invention

[0006] The purpose of the embodiments of the present application is to provide an electrospinning device and system, aiming to improve the problems of excessive tension in the existing production electrospinning device, the inability to electrospin on a substrate with low strength due to easy tearing, fiber sticking to the roller, non-adjustable receiving surface, and low output.

[0007] In a first aspect, the present application provides an electrospinning device, including:

[0008] A first positioning roller shaft, fixed to the mounting surface;

[0009] The second positioning roller shaft is used to cooperate with the first positioning roller shaft to transport the substrate;

[0010] The bracket is rotatably connected to the first positioning roller shaft and the second positioning roller shaft; the second positioning roller shaft and the bracket can rotate around the first positioning roller shaft so that the substrate can be perpendicular to the opening direction of the liquid tank;

[0011] The collecting electrode is connected to the bracket and is located on one side of the substrate; and

[0012] The nozzle electrode assembly is arranged on the mounting surface and is located on the other side of the substrate.

[0013] In the electrospinning device, the second positioning roller shaft and the bracket can rotate around the first positioning roller shaft; and the rotation of the second positioning roller shaft and the first positioning roller shaft can make the substrate perpendicular to the mounting surface. When the second positioning roller shaft and the first positioning roller shaft transport substrates such as non-woven fabrics and the substrate is in a state perpendicular to the opening direction of the liquid tank, during the electrospinning process, the fibers are easier to collect, which can increase the yield of nanofibers. Moreover, traditional horizontal electrospinning equipment needs to apply a large tension to keep the base cloth straight, so more roller shafts are required. The electrospun fibers need to contact the roller shafts, and fiber sticking to the rollers often occurs. However, the vertically placed substrate can naturally remain straight without applying a large tension, and at least two roller shafts can be used, thus avoiding the direct contact between the electrospun fibers and the rollers and solving the problem of fiber sticking to the rollers. At the same time, since the vertically arranged base cloth can remain straight without applying a large tension, the problem of tearing the substrate can be avoided.

[0014] In other embodiments of the present application, the second positioning roller shaft and the bracket can rotate within an interval where the substrate is perpendicular to the mounting surface and inclined to the nozzle electrode assembly;

[0015] Optionally, the rotation angle is within the range of 0 to 45°.

[0016] In other embodiments of the present application, the above-mentioned electrospinning device includes a push rod, the push rod has a connecting end and a free end, the connecting end is connected to the bracket, and the free end extends in a direction away from the substrate.

[0017] In other embodiments of the present application, the above-mentioned bracket includes a first plate body, a second plate body and a connecting rod. The first plate body and the second plate body are arranged opposite to each other, a receiving space is formed between the first plate body and the second plate body, and the connecting rod is connected to the first plate body and the second plate body; the collecting electrode is arranged in the receiving space.

[0018] In other embodiments of the present application, the shapes of the first plate body and the second plate body are both equilateral triangles; the push rod is connected to a vertex of the first plate body or the second plate body.

[0019] In other embodiments of the present application, the second positioning roller shaft and the first positioning roller shaft are arranged at an upper and lower interval;

[0020] The vertical distances from the collecting electrode to the second positioning roller shaft and the first positioning roller shaft are equal.

[0021] In other embodiments of the present application, the above-mentioned nozzle electrode assembly includes a needle roller and a liquid tank;

[0022] The needle roller is rotatably arranged in the liquid tank; a cover body is arranged on the liquid tank, and the cover body blocks a part of the liquid tank opening.

[0023] In other embodiments of the present application, the above-mentioned electrospinning device includes a housing;

[0024] A partition is arranged inside the housing, and the partition divides the cavity of the housing into a first space and a second space;

[0025] The bracket, the first positioning roller shaft, the second positioning roller shaft, the collecting electrode and the nozzle electrode assembly are all arranged in the first space; a liquid supply system, a waste liquid recovery system and a connecting pipe are arranged in the second space, a hole is arranged on the partition, and the connecting pipe passes through the hole to connect the liquid supply system, the waste liquid recovery system and the nozzle electrode assembly.

[0026] In other embodiments of the present application, the above-mentioned electrospinning device further includes a temperature and humidity control device and a dryer;

[0027] The temperature and humidity control device and the dryer are both arranged in the first space.

[0028] In a second aspect, the present application provides an electrospinning system, including the aforementioned electrospinning device; and

[0029] A winding and unwinding device, the winding and unwinding device includes an unwinding positioning roller shaft and a winding positioning roller shaft, the unwinding positioning roller shaft is used to cooperate with the second positioning roller shaft to transmit the substrate; the winding positioning roller shaft is used to cooperate with the first positioning roller shaft to transmit the substrate.

[0030] The electrospinning system of the present application can solve the problem of the drooping of the parallel receiving plate substrate without high-tension conditions. Even under low-tension conditions, the substrate can be maintained flat, ensuring that the spun film will not deform or even tear on the high-tension substrate, effectively improving the uneven problem between the spun film and the substrate. At the same time, a simplified winding and unwinding device is adopted. Compared with the previous design in which the winding and unwinding are installed at the bottom of the working room at the same time, the traveling distance of the substrate is greatly shortened, the number of positioning roller shafts used is reduced, the problem that the spun film is easy to stick to the roller after being output from the working room is solved, and the integrity of the surface of the spun film is ensured. Description of the Drawings

[0031] To more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the accompanying drawings required for the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and thus should not be regarded as a limitation on the scope. For those of ordinary skill in the art, without creative efforts, other relevant drawings can also be obtained based on these drawings.

[0032] Figure 1 It is a schematic structural diagram of the electrospinning device provided by the embodiment of the present application, where the substrate is in a state perpendicular to the installation surface;

[0033] Figure 2 It is a schematic structural diagram of the substrate of the electrospinning device provided by the embodiment of the present application when it rotates to be inclined to the nozzle electrode assembly;

[0034] Figure 3 It is a schematic structural diagram of the electrospinning system provided by the embodiment of the present application.

[0035] Icons: 100 - electrospinning device; 101 - housing; 102 - partition; 103 - first space; 104 - second space; 110 - bracket; 111 - substrate; 112 - collection electrode; 113 - first plate; 120 - first positioning roller shaft; 130 - second positioning roller shaft; 140 - nozzle electrode assembly; 141 - seat body; 142 - needle roller; 143 - liquid tank; 144 - cover; 145 - liquid tank opening; 150 - push rod; 160 - temperature and humidity control device; 170 - dryer; 181 - liquid supply system; 182 - waste liquid recovery system; 183 - connecting pipe; 184 - liquid supply peristaltic pump; 185 - liquid supply bucket; 186 - liquid discharge peristaltic pump; 187 - waste liquid recovery bucket; 200 - electrospinning system; 210 - winding and unwinding device; 211 - unwinding positioning roller shaft; 212 - winding positioning roller shaft. Detailed Embodiments

[0036] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. Usually, the components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0037] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the present application to be protected, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present application.

[0038] It should be noted that like reference numerals and letters denote like items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0039] In the description of the embodiments of the present application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of this application is usually placed during use, or the orientation or positional relationship commonly understood by those skilled in the art. It is only for the convenience of describing the present application 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 application.

[0040] In addition, the terms "first", "second", etc. are only used for distinguishing descriptions and should not be construed as indicating or implying relative importance.

[0041] Please refer to Figures 1 to 2 , an electrospinning device 100 is provided in an embodiment of the present application, including: a bracket 110, a collecting electrode 112, a first positioning roller shaft 120, a second positioning roller shaft 130, and a nozzle electrode assembly 140. The second positioning roller shaft 130 and the first positioning roller shaft 120 are used to transport substrates such as non-woven fabrics. Further, the bracket 110 is rotationally connected to the first positioning roller shaft 120 and the second positioning roller shaft 130, and the first positioning roller shaft 120 and the second positioning roller shaft 130 are arranged vertically opposite to each other. The first positioning roller shaft 120 is fixed on the installation surface. The second positioning roller shaft 130 is movable. The nozzle electrode assembly 140 is arranged on the installation surface. The second positioning roller shaft 130 and the bracket 110 can rotate around the first positioning roller shaft 120 so that the substrate 111 can be perpendicular to the installation surface.

[0042] The above-mentioned installation surface can be the ground or the like.

[0043] Further, the collecting electrode 112 is connected to the bracket 110 and is located on one side of the substrate 111; the nozzle electrode assembly 140 is arranged on the other side of the substrate 111.

[0044] Under the action of the electric field force of the nozzle electrode assembly 140 and the collecting electrode 112, after the nanofiber filaments are ejected from the positive electrode, they are directly adsorbed on the vertical substrate, avoiding problems such as substrate wire hanging, substrate unevenness, and uneven spinning film surface.

[0045] Further, in some embodiments of the present application, the electrospinning device 100 includes a housing 101, a bracket 110, a first positioning roller shaft 120, a second positioning roller shaft 130, a nozzle electrode assembly 140, a push rod 150, a temperature and humidity control device 160, and a dryer 170.

[0046] Furthermore, a partition 102 is provided inside the above-mentioned housing 101, and the partition 102 divides the cavity of the housing 101 into a first space 103 and a second space 104.

[0047] Furthermore, the bracket 110, the first positioning roller shaft 120, the second positioning roller shaft 130, the collecting electrode 112, and the nozzle electrode assembly 140 are all arranged in the first space 103; a liquid supply system 181, a waste liquid recovery system 182, and a connecting pipe 183 are arranged in the second space 104. A hole is provided on the partition 102, and the connecting pipe 183 passes through the hole to connect the liquid supply system 181, the waste liquid recovery system 182, and the nozzle electrode assembly 140.

[0048] Refer to Figure 1 , in the illustrated embodiment, the nozzle electrode assembly 140 is arranged in the first space 103 and is mounted on the seat body 141, and the seat body 141 is fixed on the partition 102. A hole is provided on the partition 102 below the seat body 141. One end of the connecting pipe 183 passes through the hole and is connected to the nozzle electrode assembly 140, and the other end extends into the second space 104.

[0049] Furthermore, the liquid supply system 181 includes a liquid supply peristaltic pump 184 and a liquid supply barrel 185. The liquid supply barrel 185 is connected to the liquid supply peristaltic pump 184 through the connecting pipe 183, and the liquid supply peristaltic pump 184 is connected to the nozzle electrode assembly 140 through the hole provided on the partition 102 by the connecting pipe 183. Thus, under the action of the liquid supply peristaltic pump 184, the electrospinning liquid in the liquid supply barrel 185 can be continuously pumped into the nozzle electrode assembly 140.

[0050] Furthermore, the waste liquid recovery system 182 includes a liquid discharge peristaltic pump 186 and a waste liquid recovery barrel 187. Further, the waste liquid recovery barrel 187 is connected to the liquid discharge peristaltic pump 186 through the connecting pipe 183, and the liquid discharge peristaltic pump 186 is connected to the nozzle electrode assembly 140 through the hole provided on the partition 102 by the connecting pipe 183. Thus, under the action of the liquid discharge peristaltic pump 186, the waste liquid generated in the nozzle electrode assembly 140 can be continuously recovered into the waste liquid recovery barrel 187.

[0051] Further optionally, the above-mentioned connecting pipe 183 is connected to the liquid supply system 181, the waste liquid recovery system 182, and the nozzle electrode assembly 140 in a threaded quick-insertion manner.

[0052] Further, in some embodiments of the present application, the aforementioned bracket 110 includes a first plate body 113, a second plate body (not shown in the figure), and a connecting rod (not shown in the figure). The first plate body 113 and the second plate body are identical in size and shape. In the illustrated embodiment, the first plate body 113 and the second plate body are disposed opposite to each other. Two ends of the first positioning roller shaft 120 are connected to the bottom ends of the first plate body 113 and the second plate body, and the bottom ends of the first plate body 113 and the second plate body are fixed on the partition plate 102. Two ends of the first positioning roller shaft 120 are connected to the top ends of the first plate body 113 and the second plate body. A receiving space is formed between the first plate body 113 and the second plate body, and the connecting rod is connected to the first plate body 113 and the second plate body; the collecting electrode 112 is disposed in the receiving space.

[0053] Further, the push rod 150 has a connecting end and a free end. The connecting end is connected to the bracket 110, and the free end extends in a direction away from the base 111.

[0054] Further, in the illustrated embodiment, the shapes of the first plate body 113 and the second plate body are both equilateral triangles. The push rod 150 is connected to one vertex angle of the first plate body 113 or the second plate body, and the base is transported along the opposite bottom side of the first plate body 113 or the second plate body.

[0055] Setting the shape of the aforementioned bracket 110 as an equilateral triangle and disposing the push rod 150 at its vertex angle can stably rotate the bracket 110 by using the push rod 150, thereby adjusting the included angle between the base and the nozzle electrode assembly 140, and further enabling the adjustment of the base according to the ejection angle of the nanofiber filaments.

[0056] Further, the second positioning roller shaft 130 and the first positioning roller shaft 120 are arranged at an upper and lower interval.

[0057] Further, the vertical distances from the collecting electrode 112 to the second positioning roller shaft 130 and the first positioning roller shaft 120 are equal. That is, it is disposed at the midpoint position in their vertical direction, so as to ensure that the nanofiber filaments are uniformly collected on the base.

[0058] Further, the collecting electrode 112 is disposed close to the base 111, but with a small interval to avoid contacting the transported base.

[0059] Further, the collecting electrode 112 is made of a conductive metal material. Further optionally, the length of the collecting electrode 112 should not be less than 1000 mm.

[0060] Further, the outer surfaces of the first positioning roller shaft 120 and the second positioning roller shaft 130 should be insulated, for example, wrapped with rubber, foam rubber, etc. By performing the insulation treatment, it can prevent the influence on the negative electrode for collecting fiber filaments.

[0061] In other alternative embodiments of the present application, the shape of the above-mentioned bracket 110 can also be set to other shapes, such as a quadrilateral, etc. At this time, the above-mentioned push rod 150 can be installed at the midpoint of the opposite sides of the base 111.

[0062] Furthermore, the material of the above-mentioned bracket 110 is selected to be made of an insulating material. Further, in some embodiments of the present application, the material of the above-mentioned bracket 110 can be selected as a polymer.

[0063] Furthermore, the collecting electrode 112 is arranged at the midpoint position of the base 111.

[0064] Referring to Figure 1 , in the illustrated embodiment, at this time, the bracket 110 is in a state perpendicular to the mounting surface, that is, perpendicular to the partition 102 in the illustration. At this time, the base 111 is perpendicular to the partition 102, and the second positioning roller shaft 130 is arranged directly above the first positioning roller shaft 120. When transporting a base such as a non-woven fabric (as the collecting surface of nanofibers) through the second positioning roller shaft 130 and the first positioning roller shaft 120, it is possible to easily control the collecting surface of the nanofibers to be parallel to the nozzle electrode assembly 140, thereby ensuring that the nanofibers are vertically adsorbed on the non-woven fabric.

[0065] It should be particularly emphasized that during use, the angle of the collecting surface of the nanofibers is adjusted to the maximum receiving surface parallel to the tangent of the needle roller of the nozzle electrode assembly 140.

[0066] Furthermore, the second positioning roller shaft 130 and the bracket 110 can rotate within an interval where the base 111 is perpendicular to the mounting surface (the partition 102 in the illustrated embodiment) and inclined to the nozzle electrode assembly 140.

[0067] Furthermore, the rotation angle of the base 111 is within the range of 0 to 45°.

[0068] Further optionally, the rotation angle of the base 111 is within the range of 5 to 40°.

[0069] Exemplarily, the rotation angle of the base 111 is 15°, 20°, 25°, 30° or 40°.

[0070] Furthermore, the nozzle electrode assembly 140 includes a needle roller 142 and a liquid tank 143.

[0071] Furthermore, the needle roller 142 is rotatably arranged in the liquid tank 143; a cover body 144 is arranged on the liquid tank 143, and the cover body 144 blocks a part of the liquid tank opening 145. In the illustrated embodiment, the cover body 144 blocks the part of the liquid tank opening 145 away from the base 111.

[0072] In some embodiments of the present application, the above-mentioned needle roller 142 includes an axis and a sleeve, and a plurality of wire nozzles are arranged on the sleeve. Further optionally, the material of the above-mentioned axis is stainless steel. The material of the above-mentioned sleeve is polypropylene, and the material of the above-mentioned wire nozzles is stainless steel.

[0073] Further, in the illustrated embodiment, the above-mentioned cover 144 covers half of the opening of the liquid tank 143.

[0074] The above-mentioned needle roller 142 is driven to rotate by a driving member such as a motor, and the rotation direction of the needle roller 142 is opposite to the rotation directions of the first positioning roller shaft 120 and the second positioning roller shaft 130.

[0075] Further, the temperature and humidity control device 160 and the dryer 170 are both arranged in the aforementioned first space 103.

[0076] By arranging the above-mentioned temperature and humidity control device 160 and the dryer 170, the ambient temperature in the electrostatic mode can be better controlled, and the problems caused by too high ambient humidity, such as the premature formation of filaments in the tow, mutual entanglement to form hanging filaments, and even dangerous phenomena such as short circuits and fires, can be avoided.

[0077] Refer to Figure 1 , in the illustrated embodiment, the above-mentioned temperature and humidity control device 160 is arranged in the area between the left side wall of the housing 101 and the spray head electrode assembly 140, and the above-mentioned dryer 170 is arranged in the area between the right side wall of the housing 101 and the bracket 110.

[0078] It should be noted that during operation, both the temperature and humidity control device 160 and the dryer 170 should be kept on, and the drying temperature range is between 40 and 60 °C and should not exceed 70 °C.

[0079] In some embodiments of the present application, the above-mentioned temperature and humidity control device 160 includes a dehumidifier, a temperature and humidity meter, and an exhaust component. Further optionally, the dehumidifier is connected to the first space 103 through a pipeline. The pipeline dehumidifier has a temperature control function and can control the temperature inside the housing 101 to be between 25 and 35 °C and the humidity to be between 20% and 60%.

[0080] Refer to Figure 3 , some embodiments of the present application also provide an electrospinning system 200, which includes the electrospinning device 100 provided in any of the above-mentioned embodiments and a winding and unwinding device 210.

[0081] Further, the winding and unwinding device 210 includes an unwinding positioning roller shaft 211 and a winding positioning roller shaft 212. The unwinding positioning roller shaft 211 is used to cooperate with the second positioning roller shaft 130 to transport the substrate; the winding positioning roller shaft 212 is used to cooperate with the first positioning roller shaft 120 to transport the substrate.

[0082] In the illustrated embodiment, the unwinding positioning roller shaft 211 is arranged at the top of the housing 101. By opening a hole in the top wall of the housing 101, a substrate such as non-woven fabric is transmitted into the housing 101 and sequentially reaches the second positioning roller shaft 130 and the first positioning roller shaft 120 for transmission. The winding positioning roller shaft 212 is arranged in the aforementioned second space 104. A hole is opened in the partition plate 102, and the substrate such as non-woven fabric is transmitted from the first positioning roller shaft 120 through the hole and then transmitted to the winding positioning roller shaft 212 for winding.

[0083] The electrospinning system of the present application can solve the problem of the drooping of the parallel receiving plate substrate without high-tension conditions. Even under low-tension conditions, the substrate can be maintained flat, ensuring that the spun fiber membrane will not deform or even tear on the high-tension substrate, effectively improving the problem of non-uniformity between the spun fiber membrane and the substrate. At the same time, a simplified unwinding and winding device is adopted. Compared with the previous design in which the unwinding and winding are installed at the bottom of the working room at the same time, the traveling distance of the fabric substrate is greatly shortened, the number of positioning roller shafts used is reduced, the problem that the spun fiber membrane is easy to stick to the roller after being output from the working room is solved, and the integrity of the surface of the spun fiber membrane is ensured.

[0084] The following combines specific implementation examples to exemplarily illustrate the use process of the electrospinning system 200:

[0085] Implementation example 1: Large-scale continuous production of polyvinyl alcohol (PVA) non-woven fabric.

[0086] 1. Turn on the temperature and humidity control device 160 to control the temperature in the electrospinning device 100 at 30 - 32 °C and the humidity at 35% - 40%.

[0087] 2. Install the non-woven fabric substrate of the spinning machine. After fixing the fabric roll at 11 / 12 of the unwinding positioning roller shaft 211, it enters through the fabric inlet of the housing 101, passes through the first positioning roller shaft 120; after passing through the second positioning roller shaft 130, it passes out through the fabric outlet and is connected to the winding positioning roller shaft 212.

[0088] 3. Install the liquid tank 143 and the needle roller 142, connect the liquid tank 143 and the liquid supply system 181, connect two silicone tubes with a length of about 2 m to the two interfaces of the liquid tank 143 respectively, and connect the waste liquid recovery system 182. Add about 5 L of polyvinyl alcohol solution (PVA, molecular mass is 1799, solvent is deionized water, mass fraction is about 12%) to the liquid supply bucket 185. Close the sealing door of the housing 101, inject about 1 L of spinning solution into the liquid tank 143 until the liquid level is higher than the lowest wire spray head of the positive electrode needle roller 142. Start the rotation electrode of the needle roller 142 and set the rotation speed to 7 rpm.

[0089] 4. Adjust the base angle to make the outer tangent plane of the needle roller 142 perpendicular to the base, and set the distance between the two to be 35 cm. Start the unwinding positioning roller shaft 211, and set the cloth feeding speed to 50 cm / min. Turn on the dryer 170 and set the power to 900 W.

[0090] 5. Turn on the high-voltage DC power supply inside the housing 101, and set the positive voltage to 52 kV and the negative voltage to 48 kV. Turn on the LED spotlight, and it can be observed that continuous and dense polymer nanofibers are ejected from the needle roller 142 under the stretching of the electric field force and then adsorbed on the vertically collected base.

[0091] The results show that the vertical collection system and the nozzle electrode assembly 140 operate stably. Through continuous collection, a non-woven fabric roll attached with PVA nanofibers is finally formed.

[0092] Example 2: Large-scale continuous production of polyacrylonitrile (PAN) non-woven fabrics.

[0093] 1. Turn on the temperature and humidity control device 160 to control the temperature inside the electrospinning device 100 at 28 - 30 °C and the humidity at 32% - 35%;

[0094] 2. Install the non-woven fabric base of the spinning machine. After fixing the fabric roll at 11 / 12 of the unwinding positioning roller shaft 211, it enters through the fabric inlet of the housing 101 and passes through the first positioning roller shaft 120; after passing through the second positioning roller shaft 130, it passes out through the fabric outlet and is connected to the winding positioning roller shaft 212.

[0095] 3. Install the liquid tank 143 and the needle roller 142, connect the liquid tank 143 and the liquid supply system 181, connect two silicone tubes with a length of about 2 m to the two interfaces of the liquid tank 143 respectively, and connect the waste liquid recovery system 182. Add about 5 L of polyacrylonitrile solution (average molecular weight of PAN is 150,000, the solvent is deionized water, and the mass fraction is about 11%) to the supply bucket 185. Close the sealing door of the housing 101, and inject about 1 L of solution into the liquid tank until the liquid level is higher than the lowest wire nozzle of the positive needle roller 142. Start the rotating electrode of the needle roller 142 and set the rotation speed to 8.5 rpm.

[0096] 4. Adjust the angle of the vertical collection system and the base angle to make the outer tangent plane of the needle roller 142 perpendicular to the base, and set the distance between the two to be 340 cm. Start the unwinding positioning roller shaft 211, and set the cloth feeding speed to 30 cm / min. Turn on the dryer 170 and set the power to 1200 W.

[0097] 5. Turn on the high-voltage DC power supply, and set the positive voltage to 55 kV and the negative voltage to 45 kV. Turn on the LED spotlight, and it can be observed that continuous and dense polymer nanofibers are ejected from the positive electrode under the stretching of the electric field force and then adsorbed on the vertically collected base.

[0098] The results show that the vertical collection system and the nozzle electrode assembly 140 operate stably. Through continuous collection, a non-woven fabric roll attached with PAN nanofibers is finally formed.

[0099] The above are only the preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. An electrospinning device, characterized in that, it includes: A first positioning roller shaft, fixed to the mounting surface; A second positioning roller shaft, used to cooperate with the first positioning roller shaft to transport the substrate; The first positioning roller shaft and the second positioning roller shaft are arranged vertically opposite to each other; the second positioning roller shaft is movable; A bracket, rotatably connected to the first positioning roller shaft and the second positioning roller shaft; the second positioning roller shaft and the bracket can rotate around the first positioning roller shaft so that the substrate can be perpendicular to the mounting surface; A collecting electrode, connected to the bracket and located on one side of the substrate; and A nozzle electrode assembly, arranged on the mounting surface and located on the other side of the substrate; Under the action of the electric field force of the nozzle electrode assembly and the collecting electrode, after the nanofiber filaments are ejected from the positive electrode, they are adsorbed on the vertical substrate; The shape of the bracket is set as an equilateral triangle, and a push rod is arranged at its top angle. The push rod is used to rotate the bracket to adjust the angle between the substrate and the nozzle electrode assembly; the vertical distances from the collecting electrode to the second positioning roller shaft and the first positioning roller shaft are equal; The second positioning roller shaft and the bracket can rotate within the range where the substrate is perpendicular to the mounting surface and inclined to the nozzle electrode assembly; The rotation angle is within the range of 0 to 45°; The bracket includes a first plate body, a second plate body and a connecting rod. The first plate body and the second plate body are arranged opposite to each other. A receiving space is formed between the first plate body and the second plate body. The connecting rod is connected to the first plate body and the second plate body; the collecting electrode is arranged in the receiving space; The shapes of the first plate body and the second plate body are both equilateral triangles; the push rod is connected to one top angle of the first plate body or the second plate body.

2. The electrospinning device according to claim 1, characterized in that, the second positioning roller shaft and the first positioning roller shaft are arranged vertically at intervals.

3. The electrospinning device according to any one of claims 1-2, characterized in that, the nozzle electrode assembly includes a needle roller and a liquid tank; the needle roller is rotatably arranged in the liquid tank; a cover body is arranged on the liquid tank, and the cover body blocks part of the opening of the liquid tank.

4. The electrospinning device according to any one of claims 1-2, characterized in that, the electrospinning device includes a housing; a partition is arranged in the housing, and the partition divides the cavity of the housing into a first space and a second space; The bracket, the first positioning roller shaft, the second positioning roller shaft, the collecting electrode and the nozzle electrode assembly are all arranged in the first space; a liquid supply system, a waste liquid recovery system and connecting pipes are arranged in the second space. There are holes on the partition, and the connecting pipes pass through the holes to connect the liquid supply system, the waste liquid recovery system and the nozzle electrode assembly.

5. The electrospinning device according to claim 4, characterized in that, the electrospinning device further includes a temperature and humidity control device and a dryer; the temperature and humidity control device and the dryer are both arranged in the first space.

6. An electrospinning system, characterized in that, including the electrospinning device according to any one of claims 1 to 5; and a rewinding and unwinding device, which includes an unwinding positioning roller shaft and a winding positioning roller shaft. The unwinding positioning roller shaft is used to cooperate with the second positioning roller shaft to transfer the substrate; the winding positioning roller shaft is used to cooperate with the first positioning roller shaft to transfer the substrate.

Images