CN114214738A

CN114214738A - Curved surface electrostatic spinning device

Info

Publication number: CN114214738A
Application number: CN202111674522.6A
Authority: CN
Inventors: 徐岚; 尹静; 刘福娟; 王萍; 魏凯
Original assignee: Suzhou University
Current assignee: Suzhou University
Priority date: 2021-12-31
Filing date: 2021-12-31
Publication date: 2022-03-22

Abstract

The application relates to a curved electrostatic spinning device, which comprises a spinning head and a spinning device, wherein the spinning head is provided with a curved convex surface; the liquid supply device comprises a liquid supply device and a liquid supply pipe, one end of the liquid supply pipe is connected with the liquid supply device, the other end of the liquid supply pipe forms a liquid outlet end, a liquid outlet is arranged on the liquid outlet end, the liquid outlet end penetrates out of the convex surface from bottom to top, and the liquid outlet is positioned above the convex surface so that the spinning liquid overflowing from the liquid outlet covers the convex surface; the recovery device is arranged below the spinning head; the power supply device is electrically connected with the spinning head so that the spinning solution flowing through the convex surface generates jet flow under the electrostatic action; and a receiving device disposed above the spinning head to receive the jet. This application is through making the feed pipe wear out the bellying of curved surface form, and the play liquid end that reachs the feed pipe when the spinning liquid spills over through the liquid outlet, evenly spreads in bellying, and power supply unit applys high voltage in the spinning head this moment to and receiving arrangement between produce the electric field, make each department of bellying all can produce the efflux, increase efflux quantity, raise the efficiency.

Description

Curved surface electrostatic spinning device

Technical Field

The invention relates to a curved surface-shaped electrostatic spinning device, and belongs to the technical field of electrostatic spinning.

Background

With the rapid development of nanotechnology, the characteristics of high specific surface area, high length-diameter ratio and the like of the nanofiber are widely applied to the fields of biology, filtration, energy and the like. Electrostatic spinning is one of the simplest methods for preparing nano fibers, and the traditional single-needle electrostatic spinning technology has the defects that a needle is easy to block, the yield is only 0.01-0.1 g/h, and industrial application is difficult to realize. Many researchers have devoted to intensive research into multi-needle electrospinning and pinless electrospinning technologies to improve the yield of nanofibers. The multi-needle electrostatic spinning technology is only to increase the number of needles on the basis of the single-needle electrostatic spinning technology, and is considered to be one of the most effective methods for improving the yield of the nano fibers, but the multi-needle electrostatic spinning technology has the defects that a spinning needle head is easy to block, the arrangement design of the needle head is complex, and the like. The pinless electrostatic spinning comprises bubble electrostatic spinning, rotating disc type electrostatic spinning, free liquid level spinning and other technologies. The free liquid level spinning technology utilizes the electrostatic force provided by a high-voltage electric field to overcome the surface tension of the liquid level of a polymer, forms a Taylor cone on the surface of the polymer and further forms jet flow, the jet flow is attenuated into nano fibers under the action of the electric field force, but the jet flow is generated only at the edge of conductive metal, so that the spinning yield is influenced.

Disclosure of Invention

The invention aims to provide a curved electrostatic spinning device which can improve the number of jet flows so as to improve the spinning yield.

In order to achieve the purpose, the invention provides the following technical scheme: a curved electrospinning device comprising:

the spinning head is provided with a curved convex surface;

the liquid supply device comprises liquid supply equipment and a liquid supply pipe, one end of the liquid supply pipe is connected with the liquid supply equipment, the other end of the liquid supply pipe forms a liquid outlet end, a liquid outlet is formed in the liquid outlet end, the liquid outlet end penetrates out of the convex surface from bottom to top, and the liquid outlet is positioned above the convex surface so that spinning liquid overflowing from the liquid outlet covers the convex surface;

a recovery device disposed below the spinning head;

a power supply device electrically connected with the spinning head so as to enable the spinning solution flowing through the convex surface to generate jet flow under the electrostatic action; and

a receiving device disposed above the spinneret to receive the jet.

Furthermore, recovery unit includes the holding chamber, sets up recovery mouth on the recovery unit lateral wall and set up in the recess at recovery unit top, the recess with recovery mouth all with the holding chamber intercommunication, the recess is used for receiving from the spinning liquid that the bellying flows down.

Furthermore, the liquid supply pipe comprises a main pipe and a plurality of branch pipes which are circumferentially arranged at one end of the main pipe, the branch pipes penetrate through the convex surface, and the liquid outlet end is formed on the branch pipes.

Further, the spinning head is in a spherical crown shape.

Further, the axis of the spinning head overlaps with the axis of the supply tube.

Further, the spinning head is made of copper.

The invention has the beneficial effects that: this application is through setting the spinneret to the structure that has the bellying of curved surface form, make the feed pipe wear out this bellying, supply liquid equipment to supply liquid and make the spinning liquid reach the play liquid end of feed pipe, the spinning liquid overflows through the liquid outlet, and the even bellying of spreading at the spinneret, power supply unit applys high voltage in spinning head department this moment, and with receiving arrangement between produce the electric field, so that the bellying of evenly spreading the spinning liquid is under the electrostatic field effect, all can produce the efflux everywhere on it, unnecessary spinning liquid can flow the recovery unit reuse of below from the bellying simultaneously, avoid extravagant, compared with prior art, the efflux quantity has been increased by a wide margin, and the production efficiency is improved.

The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to implement them in accordance with the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings.

Drawings

FIG. 1 is a schematic structural diagram of a curved electrostatic spinning apparatus according to an embodiment of the present invention;

fig. 2 is a schematic cross-sectional view of the curved electrospinning apparatus shown in fig. 1 in a plan view.

Detailed Description

The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.

Referring to fig. 1, a curved electrostatic spinning apparatus according to an embodiment of the present invention includes a spinning head 1, a liquid supply device 2, a recovery device 3, a power supply device 4, and a receiving device 5. The spinning head 1 has a curved convex surface 11. The liquid supply device 2 includes a liquid supply device 21 and a liquid supply tube 22 having one end connected to the liquid supply device 21, the other end of the liquid supply tube 22 forms a liquid outlet (not numbered), the liquid outlet is provided with a liquid outlet 6, the liquid outlet penetrates the convex surface 11 from bottom to top, and the liquid outlet 6 is located above the convex surface 11 so that a spinning solution (not shown) overflowing from the liquid outlet 6 covers the convex surface 11. The recovery device 3 is disposed below the spinning head 1. The power supply means 4 is electrically connected to the spinning head 1 so that the spinning solution flowing through the raised surface 11 generates a jet (not shown) by electrostatic action. A receiving device 5 is arranged above the spinning head 1 to receive the jet. Through setting spinning head 1 to the structure that has the convex surface 11 of curved surface form, make liquid feed pipe 22 wear out this convex surface 11, supply liquid equipment 21 to supply liquid and make the spinning liquid reach the play liquid end of liquid feed pipe 22, the spinning liquid overflows through liquid outlet 6, and even the convex surface 11 at spinning head 1 of spreading, power supply unit 4 applys high-voltage in spinning head 1 department this moment, and produce the electric field between receiving arrangement 3, so that protruding face 11 each department all can produce the efflux, unnecessary spinning liquid can flow in recovery unit 3 of below from protruding face 11, avoid extravagant, compared with prior art, the efflux quantity has been increased by a wide margin, and the production efficiency is improved.

It should be noted that, the recovery device 3 and the liquid supply tube 22 are both insulated, so that when the power supply device 4 supplies power, the liquid supply tube 22 or the recovery device 3 is not insulated, which affects the convex surface 11, and reduces the spinning efficiency. The receiving device 5 needs to be provided with a grounding end to prevent the receiving device 5 from absorbing static electricity when receiving jet flow and injuring users, and simultaneously prevent the static electricity on the receiving device 5 from influencing the received nano fibers to cause loss. The power supply 4 is a high voltage power supply, which is known in the art and will not be described in detail here.

The liquid supply tube 22 penetrates the highest point of the convex surface 11, so that the spinning solution overflowing from the liquid outlet 6 can flow downwards from the highest point of the convex surface 11 under the action of gravity, the spinning solution can be attached to all parts of the convex surface 11, and meanwhile, the height of the liquid outlet 6 is 1-2mm higher than the highest point of the convex surface 11, so that the situation that the spinning solution cannot be fully attached to the convex surface 11 due to the fact that the liquid outlet 6 is too far away from the convex surface 11 or the liquid outlet 6 is too close to the convex surface 11 to cause the concentrated jet flow at the liquid outlet 6, so that the spinning is uneven is avoided. In this embodiment, the liquid supply tube 22 penetrates from the lower part of the recovery device 3, penetrates from the upper part of the recovery device 3, and then penetrates from the lower part to the upper part to pass through the convex surface 11.

The recovery device 3 comprises an accommodating cavity (not shown), a recovery port 31 arranged on the recovery device 3 and a groove 32 arranged at the top of the recovery device 3, the groove 32 and the recovery port 31 are both communicated with the accommodating cavity, and the groove 32 is used for receiving the spinning solution flowing down from the convex surface 11. Specifically, when carrying out the spinning, the spinning liquid spills over from liquid outlet 6 and evenly adheres to on protruding face 11, and unnecessary spinning liquid receives the action of gravity to fall into recess 32 from protruding face 11 to finally collect the holding intracavity, after the spinning, can avoid extravagant through retrieving the unified recycle of spinning liquid of mouth. It should be noted that the groove 32 is located outside the bottom of the convex surface 11 for one circle, so that the excessive spinning solution can be sufficiently recovered. Of course, in other embodiments, the recovery device 3 may be configured in other structures, and the recovery port 31 may be connected to the liquid supply device 21 to form an internal circulation of the spinning solution, thereby improving the spinning efficiency.

In this embodiment, the liquid supply tube 22 includes a main tube 221 and a plurality of branch tubes 222 circumferentially arranged at one end of the main tube 221, the plurality of branch tubes 222 penetrate the convex surface 11, and the liquid outlet end is formed on the plurality of branch tubes 222. Specifically, the number of the branched tubes 222 is ten, and ten branched tubes 222 are circumferentially arranged on the header pipe 221 and penetrate out of the convex surface 11, that is, the ten branched tubes 222 are circumferentially arranged at the highest point of the convex surface 11, and the distance between every two branched tubes 222 is the same, so that the uniformity of the spinning solution attached to the convex surface 11 is further improved, and the spinning efficiency and the spinning quality are improved. In other embodiments, the number and arrangement of the branch pipes 222 may be adjusted according to the shape of the convex surface 11 and the spinning requirement, and may be specifically arranged in a matrix or irregular rows, which is not limited to this example.

In this example, the spinneret 1 has a spherical crown shape. And the axis of the spinning head 1 overlaps with the axis of the liquid supply tube 22. Specifically, a part of the spherical surface cut by the plane is called a spherical crown, the spherical crown is a curved surface and is a part of the spherical surface, the spinning head 1 is in a spherical crown shape, namely the convex surface 11 is a spherical crown surface, the surface of the spherical crown surface is smooth, the distance and radian from the highest point of the spherical crown surface to the bottom of the spherical crown surface 11 are the same, the axis of the spinning head 1 is overlapped with the axis of the liquid supply pipe 22, namely the liquid outlet 6 of the liquid supply pipe 22 is positioned above the highest point of the spherical crown surface 11, so that the spinning liquid can uniformly fall from the liquid outlet 6 under the action of gravity, the thickness and the attachment speed of each part attached to the spherical crown surface 11 are approximately the same, the spinning efficiency and the spinning uniformity are further improved, meanwhile, the spinning liquid falling from the bottom of the spherical crown surface 11 is uniform and regular, and the recovery and the subsequent arrangement are convenient.

In the present embodiment, the spinneret 1 is a copper spinneret. The metallic copper has high conductivity and corrosion resistance, is easy to process and form, and has low cost, thereby reducing the manufacturing cost of the spinning device. Of course, in other embodiments, the spinning head 1 may also be made of other materials, specifically, metallic silver, which satisfies the conductivity and the device strength required by the spinning device for spinning.

The operation flow of the curved electrostatic spinning device of the embodiment is specifically as follows: the spinning solution reaches the ten branch pipes 222 from the liquid supply device 21 through the main pipe 221 of the insulated liquid supply guide pipe 22 and uniformly overflows through the liquid outlets 6 of the ten branch pipes 222, the spinning solution slowly and uniformly spreads on the spherical crown surface 11 under the action of gravity after overflowing, and the redundant spinning solution flows into the groove 32 and is concentrated in the accommodating cavity for preparation and recovery. After the power supply device 4 supplies power, the spinning solution tiled on the spherical crown surface 11 forms a uniform Taylor cone under the stretching of the electric field force, the uniform Taylor cone is further stretched into jet flow, and the jet flow forms nano fibers through the processes of evaporation, swing and refinement when reaching the receiving device 5 from the spherical crown surface 11.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above examples only show some embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A curved electrostatic spinning device, comprising:

the spinning head is provided with a curved convex surface;

a recovery device disposed below the spinning head;

a receiving device disposed above the spinneret to receive the jet.

2. The curved electrostatic spinning apparatus according to claim 1, wherein said recycling device comprises a receiving chamber, a recycling opening formed on a sidewall of said recycling device, and a groove formed on a top of said recycling device, said groove and said recycling opening are both in communication with said receiving chamber, and said groove is adapted to receive the spinning solution flowing down from said protruding surface.

3. The curved electrospinning apparatus of claim 1, wherein the liquid supply tube comprises a main tube and a plurality of branched tubes circumferentially arranged at one end of the main tube, wherein the branched tubes extend out of the convex surface, and the liquid outlet end is formed on the branched tubes.

4. The curved electrospinning apparatus of claim 1, wherein the spinnerets are in the shape of a spherical crown.

5. The curved electrospinning apparatus of claim 4, wherein the axis of the spinneret overlaps with the axis of the supply tube.

6. The curved electrospinning apparatus of claim 1, wherein the spinnerets are copper spinnerets.