WO2023004835A1

WO2023004835A1 - Free surface electrospinning apparatus

Info

Publication number: WO2023004835A1
Application number: PCT/CN2021/109992
Authority: WO
Inventors: 徐岚; 樊培志
Original assignee: 苏州大学
Priority date: 2021-07-27
Filing date: 2021-08-02
Publication date: 2023-02-02

Abstract

The present application relates to a free surface electrospinning apparatus, comprising: at least two containing members, the containing members being used for placing a solution; a rotating component, which is connected to the at least two containing members and drives the containing members to rotate; a high-voltage generating member, which is disposed on one side of the rotating component; a receiving member, which is disposed on one side of the containing members and is grounded; and a circulating liquid supply component, which is used for collecting solution that overflows from the containing members and delivering the solution to the containing members, the circulating liquid supply component comprising a spray head for delivering solution, and the containing members are located below the spray head in the height direction of the free surface electrospinning device. By being provided with the circulating liquid supply component, said component collects solution that overflows from the containing members and then delivers the solution to the spray head from bottom to top, and the spray head is located above the containing members, so as to deliver the solution into the containing members below, thereby preventing the spray head from becoming blocked while also achieving the effect of preventing waste. Moreover, the structure is simple, and operation is convenient.

Description

Free liquid surface electrospinning device

This application claims the priority of the Chinese patent applications with the filing date on July 27, 2021 and the application numbers 202110852397.7 and 202121725667.X, the entire contents of which are incorporated in this application by reference.

【Technical field】

The application relates to a free liquid surface electrostatic spinning device, which belongs to the technical field of spinning.

【Background technique】

Electrospinning technology is currently the most common method of producing nanofibers in the world. In recent years, due to the rapid heating up of nanomaterial research, people have aroused strong interest in in-depth research on electrospinning. Electrospinning technology has the advantages of simple operation, wide application range and relatively high production efficiency, and the spun nanofibers are fine, with large specific surface area and high porosity, which has become a research hotspot.

However, the low spinning efficiency of traditional electrospinning equipment limits the mass production of nanofibers, so free liquid surface spinning came into being. Free liquid surface electrospinning is a new spinning method. The spinning principle is to use the electrostatic force provided by the high-voltage electric field to overcome the surface tension of the polymer liquid surface, form a Taylor cone on the polymer liquid surface, and further form a jet. The jet is attenuated into nanofibers under the action of electric field force.

However, although ordinary free liquid surface spinning can realize batch preparation of nanofibers, it also has defects such as unstable jet flow, easy solidification of solution, unsustainable spinning state, and waste of resources. Moreover, the traditional continuous liquid supply device supplies liquid from the bottom of the groove containing the solution from bottom to top. This liquid supply method is easy to block during the spinning process, which affects the continuous preparation of nanofiber membranes. Although the external liquid supply device can effectively supply liquid, it needs to turn off the power supply to supply liquid. There is a risk of high pressure in liquid supply under working conditions, which will affect the output of nanofibers.

Therefore, it is necessary to improve the prior art to overcome the defects in the prior art.

【Content of invention】

The purpose of this application is to provide a kind of free surface electrospinning device, it can improve spinning efficiency and spinning output, convenient and fast.

The purpose of this application is to be achieved through the following technical solutions: a free liquid surface electrospinning device, comprising:

There are at least two holding parts, and the holding parts are used to place the solution;

A rotating assembly is connected to at least two of the holding parts and drives the holding parts to rotate;

A high-voltage generating part is arranged on one side of the rotating assembly;

a receiver disposed on one side of the container and grounded; and

A circulating liquid supply component is used to collect the overflowing solution of the holding part and deliver the solution to the holding part;

Wherein, the circulating liquid supply component includes a spray head for delivering the solution, and in the height direction of the free liquid surface electrospinning device, the holding part is located below the spray head.

In one of the embodiments, the circulating liquid supply assembly includes a solution pool, the spray head is connected to the solution pool through a catheter, and the rotating assembly is arranged in the solution pool. .

In one of the embodiments, the solution pool is arranged obliquely, and the solution pool arranged obliquely has a highest point, and the spray head is arranged on a side of the solution pool opposite to the highest point.

In one of the embodiments, each of the holding parts has an initial position and a liquid filling position, and the rotating assembly drives the holding parts to switch between the initial position and the liquid filling position, and is located at the In the initial position, the holding part is set away from the spray head, and in the liquid filling position, the spray head delivers the solution into the holding part.

In one of the embodiments, a boss is arranged inside the solution pool, and the boss forms a receiving groove with the edge of the solution pool, and the rotating assembly is arranged on the boss.

In one of the embodiments, the center of the rotating component coincides with the center of the boss.

In one of the embodiments, the rotating assembly includes a driving shaft connected to the driving member and a supporting shaft connected to the driving shaft, and at least two of the containing parts are connected to the supporting shaft.

In one of the embodiments, the cross section of the solution pool is circular;

The container is arranged on the end side of the support shaft, and the length of the support shaft is smaller than the minimum diameter of the solution pool.

In one embodiment, the high voltage generator includes a high voltage power supply and a metal slide electrically connected to the high voltage power supply.

In one of the embodiments, each of the containing parts also has a spinning position, and when located at the spinning position, the containing parts are in contact with the metal sliding sheet for spinning.

In one of the embodiments, the receiving part is arranged above the holding part at the spinning position.

Compared with the prior art, the present application has the following beneficial effects: by providing a circulating liquid supply assembly, which collects the overflowing solution of the container and transports it to the nozzle from bottom to top, the nozzle is located above the container, Further, the solution is delivered to the lower container, avoiding clogging of the spray head and avoiding waste, and the structure is simple and the operation is convenient.

【Description of drawings】

Figure 1 is a schematic structural view of the free surface electrospinning device of the present application.

【Detailed ways】

In order to make the above purpose, features and advantages of the present application more obvious and understandable, the specific implementation manners of the present application will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to explain the present application, but not to limit the present application. In addition, it should be noted that, for the convenience of description, only some structures related to the present application are shown in the drawings but not all structures. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.

The terms "comprising" and "having" and any variations thereof in this application are intended to cover a non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units is not limited to the listed steps or units, but optionally also includes unlisted steps or units, or optionally further includes For other steps or units inherent in these processes, methods, products or apparatuses.

Reference herein to an "embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The occurrences of this phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is understood explicitly and implicitly by those skilled in the art that the embodiments described herein can be combined with other embodiments.

Please refer to Fig. 1, a free liquid surface electrospinning device in a preferred embodiment of the present application, including at least two holding parts 1 for placing solutions, connected with at least two holding parts 1 And the rotating assembly 2 that drives the container 1 to rotate, the high-voltage generator 3 and the receiver 4 arranged on one side of the container 1, in this embodiment, the receiver 4 is arranged above the opening of the container 1, For better nanofiber reception. The receiving member 4 can be a receiving net, or a receiving drum, etc., which is not specifically limited here, and is determined according to actual conditions. Wherein, the receiver 4 is grounded, the high voltage generator 3 is connected to the container 1 to form an electrostatic field with the receiver 4, and the spinning solution in the container 1 overcomes the pressure of the polymer liquid surface under the action of the electrostatic field. Surface tension forms a Taylor cone on the polymer liquid surface, and further forms a jet, which is thinned into nanofibers under the action of an electric field force.

As mentioned above, the rotating assembly 2 drives the container 1 to rotate, and the high-voltage generator 3 contacts the container 1 rotated to its attachment to realize electrical connection. The rotating assembly 2 includes a driving shaft 21 connected to the driving member and a supporting shaft 22 connected to the driving shaft 21 , at least two containing parts 1 are connected to the supporting shaft 22 . The driving part is a motor. In this embodiment, the holding part 1 is arranged at the end side of the support shaft 22. In other embodiments, the holding part 1 can also be arranged at other positions of the support shaft 22, which is not specifically limited here. depends. Moreover, there are four containers 1 in the present application, and correspondingly, there are two support shafts 22 . In other embodiments, the number of holding parts 1 can also be other, such as three or five, etc., which are not specifically limited here, but determined according to actual conditions.

The high-voltage generating part 3 includes a high-voltage power supply 31 and a metal slide 32 electrically connected to the high-voltage power supply 31, wherein the metal slide 32 is made of conductive metal, such as copper, iron, etc., which are not specifically limited here. It depends. As mentioned above, the holding part 1 rotates under the drive of the rotating assembly 2, so each holding part 1 also has a spinning position. Silk. Correspondingly, the material of the container 1 is also conductive metal, which is the same as the material of the metal slide 32 , which will not be repeated here.

In order to better cooperate with the metal sliding piece 32, in this embodiment, the holding part 1 is in the shape of an arc, and the arc-shaped holding part 1 has a convex arc surface, and the metal sliding piece 32 cooperates with the convex arc surface touch.

The liquid supply assembly in the prior art is generally external, and it transports the solution from bottom to top during the spinning process. This liquid supply method is likely to cause blockage of the spinning nozzle 54, thereby affecting the continuous preparation of nanofiber membranes. Moreover, when supplying liquid, the high-voltage power supply 31 needs to be turned off to supply liquid. There is a risk of high pressure in liquid supply under working conditions, but it will affect the yield of nanofibers. Therefore, in order to prevent the occurrence of clogging of the nozzle 54 during the liquid supply process and prevent the waste of spinning solution, the free liquid surface spinning device of the present application also includes a circulating liquid supply assembly 5 .

As the name implies, the circulating liquid supply assembly 5 is used to collect the overflowing solution of the container 1 and deliver the solution to the container 1 . Specifically, the circulating liquid supply assembly 5 includes a solution pool 51 and a nozzle 54 communicating with the solution pool 51 through a catheter 53 , and the rotating assembly 2 is disposed in the solution pool 51 . In the height direction of the free surface electrospinning device, the container 1 is located below the nozzle 54 . Each container 1 has an initial position and a liquid filling position. The rotating assembly 2 drives the container 1 to switch between the initial position and the liquid filling position. position, the spray head 54 delivers the solution into the container 1 .

The section of the solution pool 51 is circular. In order to prevent the spinning solution in the container 1 from overflowing to the outside of the solution pool 51 , the length of the support shaft 22 is smaller than the minimum diameter of the solution pool 51 . In this embodiment, the solution pool 51 is cylindrical, so the diameters of the solution pool 51 are consistent everywhere. In other embodiments, the solution pool 51 may also be tapered, and in this case, the length of the support shaft 22 should be smaller than the minimum diameter of the tapered solution pool 51 .

Specifically, the solution pool 51 is provided with a boss 52 , and the boss 52 and the edge of the solution pool 51 form an accommodating groove. In this embodiment, the center of the rotating assembly 2 coincides with the center of the boss 52 . That is, the center of the drive shaft 21 coincides with the center of gravity of the boss 52 to facilitate the arrangement of the drive assembly, and when each container 1 reaches a position close to the metal slide 32, it can all contact the metal slide 32 to realize spinning. . At this time, the position where the container 1 is in contact with the metal slide 32 for spinning is the spinning position.

The solution pool 51 is arranged obliquely, and the inclined solution pool 51 has a highest point, and the spray head 54 is arranged on the side of the solution pool 51 opposite to the highest point. That is, the spray head 54 is disposed at the lowest point of the solution pool 51, and the spinning solution can move from the highest point to the lowest point and collect. The spinning solution is delivered to the nozzle 54 through the catheter 53 under the action of the pump, and the solution is delivered to the container 1 located under the nozzle 54 through the nozzle 54, and the solution is delivered from top to bottom, effectively preventing the nozzle 54 from clogging, and The spinning solution is reused to prevent the waste of spinning solution.

The implementation process of the free liquid surface spinning device of the present application is: start the driving member to drive the drive shaft 21 to rotate, and then drive the support shaft 22 to rotate, so that one of the holding parts 1 moves to the spinning position, and the metal slide 32 and the The containers 1 are brought into contact to effect spinning. While the container 1 at the spinning position is now at the liquid filling position, the nozzle 54 can deliver the solution into the container 1 . The other two containing parts 1 are located at the initial position, neither spinning nor adding liquid. At this point, the driver stops running. After an interval of time, the driving part drives the drive shaft 21 to rotate again until the next holding part 1 is positioned at the spinning position. The above method can improve the spinning efficiency, and at the same time avoid the occurrence of clogging of the nozzle 54 .

To sum up: the circulating liquid supply assembly 5 is provided, which collects the overflowing solution of the container 1, and transports it to the nozzle 54 from bottom to top, and the nozzle 54 is located above the container 1, and then downward The solution is transported in the containing part 1, while avoiding the clogging of the nozzle 54, it also achieves the effect of avoiding waste, and the structure is simple and the operation is convenient.

The above is only a specific implementation manner of the present application, and any other improvements made on the premise of the idea of the present application shall be regarded as the protection scope of the present application.

Claims

A free surface electrospinning device, characterized in that it comprises:

There are at least two holding parts, and the holding parts are used to place the solution;

A rotating assembly is connected to at least two of the holding parts and drives the holding parts to rotate;

A high-voltage generating part is arranged on one side of the rotating assembly;

a receiver disposed on one side of the container and grounded; and

A circulating liquid supply component is used to collect the overflowing solution of the holding part and deliver the solution to the holding part;

Wherein, the circulating liquid supply component includes a spray head for delivering the solution, and in the height direction of the free liquid surface electrospinning device, the holding part is located below the spray head.
The free liquid surface electrospinning device according to claim 1, wherein the circulating liquid supply assembly includes a solution pool, the nozzle is connected to the solution pool through a catheter, and the rotating assembly is arranged at the in the solution pool.
The free liquid surface electrospinning device according to claim 2, wherein the solution pool is arranged obliquely, and the solution pool arranged obliquely has the highest point, and the nozzle is arranged between the solution pool and the highest point. Point the opposite side.
The free liquid surface electrospinning device according to claim 2, characterized in that, each of the holding parts has an initial position and a liquid filling position, and the rotating assembly drives the holding parts between the initial position and the filling position. The liquid filling position is switched. When it is at the initial position, the container is set away from the spray head. When it is at the liquid filling position, the spray head delivers the solution into the container.
The free liquid surface electrospinning device according to claim 2, wherein a boss is provided in the solution pool, and the boss and the edge of the solution pool form a receiving tank, and the rotating assembly is provided with on the boss.
The free surface electrospinning device according to claim 5, wherein the center of the rotating assembly coincides with the center of the boss.
The free liquid surface electrospinning device according to claim 2, wherein the rotating assembly includes a drive shaft connected to the drive member and a support shaft connected to the drive shaft, and at least two of the holding members connected to the support shaft.
The free liquid surface electrospinning device according to claim 7, wherein the cross section of the solution pool is circular;

The container is arranged on the end side of the support shaft, and the length of the support shaft is smaller than the minimum diameter of the solution pool.
The free liquid surface electrospinning device according to claim 1, wherein the high-voltage generator comprises a high-voltage power supply and a metal slide electrically connected to the high-voltage power supply.
The free liquid surface electrospinning device according to claim 9, characterized in that, each of the holding parts also has a spinning position, and when located at the spinning position, the holding parts and the metal slide The sheets are connected in contact for spinning.