CN114250522A

CN114250522A - A centrifugal electrospinning device

Info

Publication number: CN114250522A
Application number: CN202210128864.6A
Authority: CN
Inventors: 苑甫; 于杰; 蒋涛
Original assignee: Songshan Lake Materials Laboratory
Current assignee: Songshan Lake Materials Laboratory
Priority date: 2022-02-11
Filing date: 2022-02-11
Publication date: 2022-03-29

Abstract

The application provides a centrifugal electrostatic spinning device, relates to the electrostatic spinning device field. The centrifugal electrospinning device comprises: the device comprises a wire outlet electrode, an annular receiving electrode, a driving mechanism and a high voltage generator. The filament outlet electrode is provided with a bottom wall and an annular peripheral wall, the bottom wall is connected with the bottom end of the peripheral wall to form a containing groove used for containing spinning solution, the peripheral wall is provided with an air valve interface, a plurality of filament outlet holes and a plurality of air holes corresponding to the filament outlet holes, the two ends of the filament outlet holes respectively penetrate through the inner surface and the outer surface of the peripheral wall, the air holes are annularly arranged in the circumferential direction of the corresponding filament outlet holes in a clearance mode, one ends of the air holes penetrate through the outer surface of the peripheral wall, and the other ends of the air holes are located in the peripheral wall and communicated with the air valve interface. The receiving electrode is arranged in the circumferential direction of the wire electrode and is provided with an inner ring surface used for receiving fibers output by the wire electrode. The spinning efficiency is effectively improved and the phenomenon of yarn hanging is avoided by utilizing the comprehensive action of rotary centrifugation, electrostatic field and airflow jet.

Description

Centrifugal electrostatic spinning device

Technical Field

The application relates to the field of electrostatic spinning devices, in particular to a centrifugal electrostatic spinning device.

Background

The electrostatic spinning technology is a common production method of nano-fibers. The spinning solution forms a taylor cone under the action of the electric field force, then is continuously stretched into fibers with the diameter of 100 to 500 nanometers, and finally is collected by a metal collector with static electricity to form a nanofiber film.

In recent years, with the continuous development of nanotechnology, nanofiber mats with a certain thickness have attracted much attention in the fields of cell biotechnology, super capacitor containers and the like by virtue of the special three-dimensional network structure thereof. At present, a rotary centrifugal electrostatic spinning method is usually adopted to prepare the nano-fiber felt. When the method works, the filament outlet needle head is rotated, so that under the double actions of an electric field and centrifugation, the solution in the needle head is easier to form a Taylor cone and is continuously stretched, and the formed nano fibers are adsorbed on the surface of the inner layer of the collector. However, because the centrifugal force is difficult to accurately control and the filament output amount of the nano-fiber is too large, the problem that filament hanging is easily caused due to uneven filament output of electrostatic spinning by a centrifugal method is solved, and the production and collection efficiency of the nano-fiber felt is reduced.

Disclosure of Invention

An object of the embodiment of the application is to provide a centrifugal electrostatic spinning device, which can solve the technical problem that the production and collection efficiency of a nanofiber felt are low due to the fact that a conventional filament discharging electrode is easy to hang a filament during electrostatic spinning.

The embodiment of the application provides a centrifugal electrostatic spinning device, it includes: the device comprises a wire outlet electrode, an annular receiving electrode, a driving mechanism and a high voltage generator.

The filament outlet electrode is provided with a bottom wall and an annular peripheral wall, the bottom wall is connected with the bottom end of the peripheral wall to form a containing groove used for containing spinning solution, the peripheral wall is provided with an air valve interface, a plurality of filament outlet holes and a plurality of air holes corresponding to the filament outlet holes, the two ends of the filament outlet holes respectively penetrate through the inner surface and the outer surface of the peripheral wall, the air holes are annularly arranged in the circumferential direction of the corresponding filament outlet holes in a clearance mode, one ends of the air holes penetrate through the outer surface of the peripheral wall, and the other ends of the air holes are located in the peripheral wall and communicated with the air valve interface.

The receiving electrode is annularly arranged on the circumference of the wire electrode and is provided with an inner ring surface used for receiving fibers output by the wire electrode, and a gap exists between the inner ring surface and the outer surface of the wire electrode.

The driving mechanism is connected with the bottom wall in an insulating way and drives the wire discharging electrode to rotate around the axis of the wire discharging electrode.

The positive pole of the high-voltage generator is electrically connected with the wire outlet electrode, and the negative pole of the high-voltage generator is electrically connected with the receiving electrode.

In the implementation process, the cup-shaped wire outlet electrode is matched with the annular receiving electrode, the peripheral wall of the wire outlet electrode is provided with a plurality of wire outlet holes, the arrangement of the wire outlet holes can prevent the nano fibers from being too large in wire outlet amount, and two ends of each wire outlet hole respectively penetrate through the inner surface and the outer surface of the peripheral wall, so that when the wire outlet electrode is driven by a driving mechanism to rotate around the axis of the wire outlet electrode, spinning liquid in the accommodating groove can be uniformly thrown out through the wire outlet holes under the action of centrifugal force and is stretched into the wire-shaped fibers by electric field force, and the spinning liquid is adsorbed on the inner ring surface of the receiving electrode under the action of the electrostatic field. Meanwhile, compressed gas is introduced through the air valve interface in the electrostatic spinning process, the compressed air is sprayed out from the air holes, and the air holes are annularly arranged in the circumferential direction of the corresponding filament outlet holes, so that the spinning solution thrown out can be further assisted by air jet to be stretched into filamentous fibers, and the filamentous fibers are conveyed to the inner ring surface to be adsorbed on the inner ring surface under the action of air jet, the filament outlet efficiency and the collection efficiency can be further improved, and filament hanging of a filament outlet electrode is effectively reduced.

That is, the centrifugal electrostatic spinning device that this application provided utilizes rotatory centrifugation, electrostatic field and air current to spray's combined action for nanometer filamentous fiber adsorbs on the interior anchor ring more efficiently, forms fluffy and have certain thickness's nanofiber felt, has not only effectively increased spinning efficiency, avoids hanging the silk simultaneously, thereby has improved the output efficiency of nanofiber felt in actual production.

In one possible embodiment, the axis of the filament-emitting electrode coincides with the axis of the receiving electrode.

In the implementation process, the axis of the wire outlet electrode is overlapped with the axis of the receiving electrode, so that the nanofiber felt with uniform thickness can be obtained in the rotating process.

In a possible embodiment, the axis of the outlet orifice coincides with the axis of the corresponding air orifice.

In the implementation process, the axes of the spinning holes are superposed with the axes of the corresponding air holes, so that the spinning liquid jet flow thrown out of the spinning holes can keep the original movement direction, and the phenomenon of yarn hanging possibly caused by the change of the movement direction of the spinning liquid jet flow by air flow is avoided.

In a possible embodiment, the diameter of the outlet opening is between 0.5mm and 2 mm.

In the above implementation, the above diameter range is advantageous for obtaining fibers with nanometer-scale diameters.

In one possible embodiment, the peripheral wall is provided with a plurality of rows of air hole groups arranged at intervals along the circumferential direction, and each row of air hole group is provided with a plurality of air holes arranged at intervals along the axial direction of the wire outlet electrode; wherein, the air holes in any two adjacent rows of air hole groups are arranged in a staggered manner.

In the implementation process, the air holes in any two adjacent air hole groups are arranged in a staggered mode, so that the utilization rate of the peripheral wall can be improved, the space between the air holes in the same horizontal plane can be larger, the phenomenon that the air holes in the same horizontal plane are small in space and possibly lead to thread adhesion is avoided, and the uniformly distributed nano fiber felt is obtained.

In one possible embodiment, the distance between any two adjacent filament outlets in each row of the gas hole group is 10mm-50 mm.

In the implementation process, uniform yarn discharge is facilitated, so that the spinning efficiency is improved.

In a possible embodiment, the gap has a radial distance of 50mm to 600 mm.

In the implementation process, the distance between the inner ring surface and the outer surface of the yarn outlet electrode is 50-600 mm, so that a better spinning effect can be realized.

In a possible embodiment, the diameter of the inner annular surface of the receiving electrode is between 100mm and 4000mm, the thickness of the receiving electrode is between 5mm and 50mm, and the height of the receiving electrode in its axial direction is between 100mm and 2000 mm.

In a possible embodiment, the peripheral wall has a top end extending out of the receiving electrode, the air valve interface is located on the outer surface of the top end, the outer surface of the top end is provided with a mounting portion, the centrifugal electrostatic spinning device further comprises an air pump arranged on the mounting portion, and an air outlet of the air pump is communicated with the air valve interface.

In the implementation process, the air outlet of the air pump is communicated with the air valve interface to convey high-pressure air to the air valve interface.

In a possible embodiment, the centrifugal electrostatic spinning device further comprises an injector and a conduit, the injector is provided with a liquid supply cavity and an injection piston, the liquid supply cavity is used for containing the spinning liquid, the liquid supply cavity is provided with a liquid inlet and a liquid outlet which are communicated with the conduit, the liquid outlet end of the conduit is suspended above the filament outlet electrode, and the injection piston is slidably arranged in the liquid supply cavity to inject the spinning liquid into the conduit.

In the implementation process, the liquid outlet end of the guide pipe is suspended above the filament outlet electrode, so that the spinning solution can be injected into the guide pipe by using the injector and is injected into the accommodating groove through the liquid outlet end of the guide pipe.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.

Fig. 1 is a schematic structural diagram of a centrifugal electrospinning device provided in example 1 of the present application;

fig. 2 is a schematic structural diagram of a wire-discharging electrode provided in embodiment 1 of the present application;

fig. 3 is a schematic sectional view taken along the line a-a in fig. 2.

Icon: 10-centrifugal electrostatic spinning device; 100-wire-out electrode; 101-a bottom wall; 102-a peripheral wall; 103-top end; 104-a receiving groove; 105-a filament outlet; 106-air holes; 107-gas valve; 108-a mounting portion; 109-an air pump; 110-a receiving electrode; 111-inner ring surface; 120-high voltage generator; 130-a drive mechanism; 131-a power supply; 140-an insulating base; 141-a mounting surface; 151-a connecting shaft; 153-a conductive portion; 155-a coupling; 161-injector; 163-catheter.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present application, it is to be noted that the terms "top", "bottom", "vertical", "horizontal", "inner", "outer", and the like refer to orientations or positional relationships based on orientations or positional relationships shown in the drawings or orientations or positional relationships that are conventionally used in the product of the application, and are used for convenience in describing the present application and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present application.

Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present application, it is further noted that, unless expressly stated or limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

It should be noted that the spinning solution may be a polymer solution or a polymer melt, where the polymer includes but is not limited to polyacrylonitrile, and may also be polyvinyl alcohol, etc., and those skilled in the art can select the spinning solution according to actual needs, and the spinning solution is not limited herein.

Example 1

Referring to fig. 1, a centrifugal electrospinning device 10 includes: a filament-emitting electrode 100, a ring-shaped receiving electrode 110, a driving mechanism 130 and a high voltage generator 120.

The wire-discharging electrode 100 is made of conductive metal such as stainless steel, aluminum alloy or copper.

Referring to fig. 1 and 2, the wire-drawing electrode 100 has a bottom wall 101 and a ring-shaped peripheral wall 102.

The peripheral wall 102 has a top end 103 and a bottom end opposite to each other, and the bottom wall 101 and the bottom end are connected to form a containing groove 104 for containing the spinning solution. That is, the filament discharging electrode 100 is cup-shaped, wherein the top end 103 is an opening end of the receiving groove 104 for receiving the spinning solution into the receiving groove 104.

The diameter of the peripheral wall 102 may remain constant from the bottom end to the top end 103 of the peripheral wall 102 as shown in fig. 1, and in some other embodiments, the diameter of the peripheral wall 102 gradually increases from the bottom end to the top end 103 of the peripheral wall 102 to facilitate receiving the spinning solution. In either arrangement, the filament-discharging electrode 100 is arranged vertically (the axis of the filament-discharging electrode 100 extends vertically), that is, the cross section of the peripheral wall 102 on any horizontal plane is circular.

Referring to fig. 2 and 3, the peripheral wall 102 has an air valve interface, a plurality of wire outlet holes 105, and a plurality of air holes 106 corresponding to the plurality of wire outlet holes 105.

Both ends of the filament outlet hole 105 penetrate through the inner surface and the outer surface of the peripheral wall 102, respectively.

Optionally, the peripheral wall 102 is provided with a plurality of rows of air hole groups arranged at intervals along the circumferential direction, and each row of air hole group is provided with a plurality of air holes 106 arranged at intervals along the axial direction of the wire outlet electrode 100; wherein the air holes 106 in any two adjacent rows of air hole groups are arranged in a staggered manner.

The staggered arrangement of the air holes 106 in any two adjacent rows of air hole groups means that: the spacing part is formed between two adjacent air holes 106 in the air hole group in the same column, and in any two adjacent air hole groups, the air holes 106 of one air hole group correspond to the spacing part of the other air hole group.

Optionally, the distance between any two adjacent filament outlet holes 105 in each row of air hole groups is 10mm to 50mm, for example, in this embodiment, the distance between any two adjacent filament outlet holes 105 in each row of air hole groups is 30mm, where the distance refers to the minimum distance between the hole walls of two filament outlet holes 105 along the arrangement direction of each air hole group.

The diameter of each filament outlet 105 is 0.5mm-2mm, for example, the diameter of the filament outlet 105 is 0.5mm, 1mm or 2mm, in this embodiment, the diameter of each filament outlet 105 is 1 mm.

The air holes 106 are circumferentially arranged on the corresponding wire outlet holes 105 with gaps, one end of each air hole 106 penetrates through the outer surface of the peripheral wall 102, and the other end of each air hole 106 is positioned in the peripheral wall 102 and communicated with the air valve 107. It can be understood that the air holes 106 are circumferentially arranged on the corresponding filament outlet holes 105 with gaps, that is, the air holes 106 are independent from the corresponding filament outlet holes 105 and are not communicated with each other.

Optionally, the axis of the filament outlet 105 coincides with the axis of the corresponding air hole 106.

The air valve interface is positioned on the outer surface of the top end 103, and an air valve 107 is arranged on the air valve interface.

As shown in fig. 1, the top end 103 extends out of the receiving electrode 110, the air valve 107 is located on the outer surface of the top end 103, the outer surface of the top end 103 is provided with a mounting portion 108, the centrifugal electrospinning device 10 further comprises an air pump 109 arranged on the mounting portion 108, and the air outlet of the air pump 109 is communicated with the air valve 107. Through the arrangement, the air pump 109 can synchronously rotate along with the rotation of the yarn outlet electrode 100, and the smooth spinning process is facilitated.

The receiving electrode 110 is circumferentially disposed on the filament-discharging electrode 100, the receiving electrode 110 has an inner annular surface 111 for receiving the electrostatic filaments output from the filament-discharging electrode 100, and a gap exists between the inner annular surface 111 and the outer surface of the filament-discharging electrode 100.

Optionally, the radial distance of the gap is 50mm to 600mm, and the gap distance is reasonable, so that the spinning solution jet flow thrown out from the spinning hole 105 can form nano-scale fibers and be adsorbed on the inner annular surface 111.

Optionally, the diameter of the inner annular surface 111 of the receiving electrode 110 is 100mm-4000mm, the thickness of the receiving electrode 110 is 5mm-50mm, and the height of the receiving electrode 110 along the axial direction thereof is 100mm-2000 mm.

The receiving electrode 110 is made of a conductive metal such as stainless steel, aluminum alloy, or copper, and the material of the receiving electrode 110 may be the same as or different from that of the wire-discharging electrode 100, which is not limited herein.

Optionally, the axis of the filament-discharging electrode 100 coincides with the axis of the receiving electrode 110, so that during the rotation of the filament-discharging electrode 100, the nanofiber mat with uniform thickness is obtained. In the actual use process, the axis of the wire-discharging electrode 100 extends vertically, that is, the wire-discharging electrode 100 and the receiving electrode 110 are both vertically arranged, which is beneficial to the uniformity of wire discharging.

Referring to fig. 1, the positive electrode of the high voltage generator 120 is electrically connected to the filament outlet electrode 100, the negative electrode of the high voltage generator 120 is electrically connected to the receiving electrode 110, and the high voltage generator 120 may be a high voltage dc power supply 131, so that a high voltage electric field is formed between the filament outlet electrode 100 and the receiving electrode 110 to implement electrostatic spinning.

The driving mechanism 130 is connected to the bottom wall 101 in an insulated manner and drives the wire-discharging electrode 100 to rotate around the axis thereof.

In practical operation, the driving mechanism 130 may be configured to drive the filament-discharging electrode 100 to rotate at a high speed not lower than 1000rpm, to throw out liquid droplets through the filament-discharging hole 105 with the above diameter by a rotating centrifugal effect, and then to be stretched into a nanofiber filament bundle with a diameter of 200-300nm under the action of an electric field force.

For the stability of the electrostatic centrifugal spinning process, the centrifugal electrostatic spinning device 10 further includes an insulating base 140 and a transmission assembly, the insulating base 140 has a mounting surface 141 and a through hole penetrating through the mounting surface 141, wherein the receiving electrode 110 is placed on the mounting surface 141 and surrounds the through hole in the circumferential direction, the filament discharging electrode 100 is located above the mounting surface 141, the driving mechanism 130 is located below the insulating base 140, the transmission assembly is rotatably disposed through the through hole, one end of the transmission assembly is connected with the bottom wall 101, the other end of the transmission assembly is connected with the driving mechanism 130, and thus the driving mechanism 130 is used for driving the filament discharging electrode 100 to rotate relative to the receiving electrode 110 along the axial direction thereof.

As shown in fig. 1, the driving mechanism 130 is a motor, and a power source 131 for supplying power to the driving mechanism 130 is connected thereto.

The transmission assembly comprises a connecting shaft 151, a conductive part 153 and a coupler 155, wherein the connecting shaft 151 is coaxially and conductively connected with the bottom wall 101, the connecting shaft 151 rotatably penetrates through the through hole and extends out of the insulating base 140, one end, located below the insulating base 140, of the connecting shaft 151 serves as a connecting end, the conductive part 153 is axially immovable and circumferentially rotatably sleeved on the connecting end, the conductive part 153 is conductively connected with the connecting end, the end part of the connecting end is coaxially connected with a transmission shaft of the motor through the coupler 155, and the coupler 155 is made of an insulating material.

That is, the wire-discharging electrode 100 and the receiving electrode 110 are coaxially arranged, and the conductive portion 153 and the wire-discharging electrode 100 are coaxially arranged and have a constant relative distance in the rotation process, which is favorable for preventing the electric field provided by the high-voltage generator 120 from being affected by rotation when the subsequent driving mechanism 130 drives the wire-discharging electrode 100 to rotate around the axis thereof, and meanwhile, the connecting shaft 151 is made of an insulating material, so that the adverse effect of high-voltage electricity on the motor can be avoided.

The conductive portion 153 may be a metal conductive slip ring or a metal bearing, and those skilled in the art can select the conductive slip ring or the metal bearing according to actual requirements, which is not limited herein.

That is, the centrifugal electrostatic spinning device 10 that this application provided utilizes rotatory centrifugation, electrostatic field and air current to spout the combined action for nanometer filamentous fiber adsorbs on interior annular 111 more efficiently, forms fluffy and have certain thickness's nanofiber felt, has not only effectively increased spinning efficiency, avoids hanging the silk simultaneously, thereby has improved the output efficiency of nanofiber felt in actual production.

The centrifugal electrospinning device 10 further includes a liquid supply system having: the injector 161 has a liquid supply cavity for accommodating the spinning solution and a liquid inlet and outlet for communicating with the conduit 163, and a liquid outlet end of the conduit 163 is suspended above the filament outlet electrode 100, and the injection piston is slidably disposed in the liquid supply cavity to inject the spinning solution into the conduit 163.

In some optional embodiments, the centrifugal electrospinning device 10 may further include a cover (not shown) covering the open end of the filament-discharging electrode 100 to close the open end of the accommodating groove 104, the cover is rotatably connected to the open end, the cover is provided with a mounting hole communicated with the accommodating groove 104, and an end of the conduit 163 away from the liquid-supplying cavity is connected to the cover and communicated with the mounting hole. With the above arrangement, the spinning solution can be prevented from being thrown out from the open end during centrifugation, and since the cap body is rotatably connected to the open end, the spinning electrode 100 does not interfere with the guide tube 163 during rotation.

Example 2

The centrifugal electrospinning apparatus 10 provided in example 1 was used to perform the Polyacrylonitrile (PAN) electrospinning nanofiber mat preparation and collection process.

1. 200ml of 12% Polyacrylonitrile (PAN) solution was drawn using the injector 161 and mounted in the liquid supply chamber, and a conduit 163 was mounted on the injector 161 and communicated with the liquid supply chamber via the liquid inlet and outlet, the liquid outlet end of the conduit 163 being suspended above the open end of the filament outlet electrode 100.

2. Connecting the conductive part 153 to the positive electrode of the high-voltage direct-current power supply 131 by a wire, and connecting the receiving electrode 110 to the negative electrode of the high-voltage direct-current power supply 131 by a wire; the air valve 107 and the air pump 109 of the wire electrode 100 are connected by air pipes.

3. The gas valve 107 is opened. Starting a motor, adjusting the rotating speed of the wire discharging electrode 100 to 1000rpm, and adjusting the injection rate of the injector 161 to 30 ml/min; the direct current power supply 131 is turned on, and the voltage of the positive electrode is adjusted to be +30kV, and the voltage of the negative electrode is adjusted to be-20 kV. And continuously spinning until the spinning solution in the solution supply cavity is completely consumed.

4. The high voltage dc power supply 131 and the motor are turned off.

The result shows that the centrifugal electrostatic spinning device 10 and other components of the spinning machine operate stably, and the white PAN nanofiber felt with a fluffy structure and a certain thickness is obtained through continuous spinning and quick collection.

Example 3

The centrifugal electrospinning apparatus 10 provided in example 1 was used to perform the preparation and collection process of polyvinyl alcohol (PVA) electrospun nanofiber mats.

1. A syringe 161 is used to draw 300ml of 10% polyvinyl alcohol (PVA) solution and is mounted within the liquid supply chamber, a conduit 163 is mounted on the syringe 161 and is in communication with the liquid supply chamber via a liquid inlet and outlet, and a liquid outlet end of the conduit 163 is suspended above an open end of the filament outlet electrode 100.

3. The gas valve 107 is opened. Starting a motor, adjusting the rotating speed of the wire discharging electrode 100 to 1500rpm, and adjusting the injection rate of the injector 161 to 35 ml/min; the dc power supply 131 is turned on to adjust the anode voltage to +35kV and the cathode voltage to-25 kV. And continuously spinning until the spinning solution in the solution supply cavity is completely consumed.

4. The high voltage dc power supply 131 and the motor are turned off.

The result shows that the centrifugal electrostatic spinning device 10 and other components of the spinning machine operate stably, and the white PVA nanofiber felt which is fluffy in structure and has a certain thickness is obtained through continuous spinning and rapid collection.

In conclusion, the centrifugal electrostatic spinning device that this application provided, its combined action that utilizes rotatory centrifugation, electrostatic field and air current to spout for the nanofiber silk adsorbs on interior anchor ring more efficiently, forms fluffy and have the nanofiber felt of certain thickness, has not only effectively increased spinning efficiency, avoids hanging the silk simultaneously, thereby has improved the output efficiency of nanofiber felt in actual production.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A centrifugal electrospinning device, comprising:

the filament outlet electrode is provided with a bottom wall and an annular peripheral wall, the bottom wall is connected with the bottom end of the peripheral wall to form a containing groove for containing spinning liquid, the peripheral wall is provided with an air valve interface, a plurality of filament outlet holes and a plurality of air holes corresponding to the filament outlet holes, two ends of the filament outlet holes respectively penetrate through the inner surface and the outer surface of the peripheral wall, the air holes are annularly arranged in the circumferential direction of the corresponding filament outlet holes with gaps, one end of each air hole penetrates through the outer surface of the peripheral wall, and the other end of each air hole is positioned in the peripheral wall and communicated with the air valve interface;

the receiving electrode is annularly arranged in the circumferential direction of the wire outlet electrode and provided with an inner ring surface used for receiving fibers output by the wire outlet electrode, and a gap is formed between the inner ring surface and the outer surface of the wire outlet electrode;

the driving mechanism is connected with the bottom wall in an insulating way and drives the wire outlet electrode to rotate around the axis of the wire outlet electrode; and

and the positive electrode of the high-voltage generator is electrically connected with the wire outlet electrode, and the negative electrode of the high-voltage generator is electrically connected with the receiving electrode.

2. The centrifugal electrospinning device of claim 1, wherein the axis of the filament-discharging electrode coincides with the axis of the receiving electrode, and the axis of the filament-discharging electrode extends vertically.

3. The centrifugal electrospinning device of claim 1, wherein the axis of the filament outlet hole coincides with the axis of the corresponding air hole.

4. The centrifugal electrospinning device of claim 1, wherein the diameter of the filament outlet holes is 0.5mm to 2 mm.

5. The centrifugal electrospinning device of claim 1, wherein the peripheral wall is provided with a plurality of rows of air hole groups arranged at intervals in the circumferential direction, each row of air hole group having a plurality of air holes arranged at intervals in the axial direction of the filament discharging electrode;

and air holes in any two adjacent rows of the air hole groups are arranged in a staggered manner.

6. The centrifugal electrospinning device of claim 5, wherein the distance between any two adjacent filament outlets in each row of the air hole groups is 10mm to 50 mm.

7. The centrifugal electrospinning device of claim 1, wherein the gap is from 50mm to 600mm in radial direction.

8. The centrifugal electrospinning device of claim 1, wherein the diameter of the inner annular surface of the receiving electrode is 100mm to 4000mm, the thickness of the receiving electrode is 5mm to 50mm, and the height of the receiving electrode in the axial direction thereof is 100mm to 2000 mm.

9. The centrifugal electrospinning device of claim 1, wherein the peripheral wall has a top end extending out of the receiving electrode, the air valve port is located on an outer surface of the top end, a mounting portion is provided on an outer surface of the top end, the centrifugal electrospinning device further comprises an air pump provided on the mounting portion, and an air outlet of the air pump is communicated with the air valve port.

10. The centrifugal electrospinning device of claim 1, further comprising an injector and a conduit, wherein the injector has a liquid supply cavity for containing the spinning solution and a push piston, the liquid supply cavity has a liquid inlet and a liquid outlet for communicating with the conduit, the liquid outlet end of the conduit is suspended above the filament outlet electrode, and the push piston is slidably disposed in the liquid supply cavity to push the spinning solution into the conduit.