Electrospinning device for batch preparation of core-shell structured nanofibers

Abstract

The present invention relates to an electrostatic spinning device for batch preparation of core-shell structure nanofibers, comprising a liquid reservoir, a first gear arranged in the liquid reservoir, a second gear connected to the first gear by a chain, a driving liquid supply mechanism for driving the second gear to rotate, a high voltage power supply connected to the second gear, and a receiving mechanism, an electrostatic field is formed between the second gear and the receiving mechanism; the second gear comprises an opening tip, and the tip is meshed with the chain, the chain is driven through the liquid reservoir so that the pitch of the chain stores the shell spinning solution, when the pitch with the shell spinning solution moves to the opening tip and meshes with it, a plurality of similar coaxial spinning head structures are formed, and the shell spinning solution and the core spinning solution are stretched into filaments to form core-shell structure fibers under the action of the electrostatic field until they are received on the receiving mechanism. It can improve the continuity and stability of spinning while improving the spinning efficiency and output.

Description

Technical Field

[0001] The invention relates to an electrostatic spinning device capable of preparing core-shell structure nanofibers in batches, belonging to the technical field of electrostatic spinning. Background Art

[0002] So far, electrospinning is one of the most effective methods for the stable preparation of nanofibers. The nanofibers obtained by electrospinning have high specific surface area and high porosity, and good biocompatibility. Therefore, they have received extensive attention in the field of biomedical materials in recent years, especially the research on the preparation of core-shell structure nanofibers in the field of drug sustained release using coaxial electrospinning technology has attracted the attention of scholars at home and abroad. However, the coaxial electrospinning equipment has very high requirements for the spinning solution, and the pinhole is prone to clogging during the spinning process, which affects the continuity and stability of the spinning process, and then affects the morphology quality of the nanofiber membrane, and the fiber membrane yield is low. Summary of the invention

[0003] The object of the present invention is to provide an electrospinning device for batch preparation of core-shell structured nanofibers, which can improve the continuity and stability of spinning while improving the spinning efficiency and output.

[0004] To achieve the above-mentioned object, the present invention provides the following technical solutions: an electrospinning device capable of batch-preparing core-shell structure nanofibers, comprising a liquid storage tank for placing a shell spinning solution, a first gear disposed in the liquid storage tank, a second gear disposed outside the liquid storage tank and connected to the first gear through a chain, a driving and liquid supplying mechanism for driving the second gear to rotate and supplying liquid to the second gear at the same time, a high-voltage power supply connected to the second gear, and a receiving mechanism disposed on one side of the second gear and grounded, wherein an electrostatic field is formed between the second gear and the receiving mechanism;

[0005] The second gear includes a plurality of open tip portions for spraying the core layer spinning solution, and the tip portions are meshed with the chain. The chain is driven through the liquid storage tank so that the shell layer spinning solution is stored in the pitch of the chain. When the pitch carrying the shell layer spinning solution moves to the open tip portion and meshes with the open tip portion, the shell layer spinning solution and the core layer spinning solution form a jet under the action of the electrostatic field to form a core-shell structure fiber until it is received on the receiving mechanism.

[0006] Furthermore, the second gear also includes a hollow main body, a plurality of opening tip portions are annularly arranged on the main body, and the opening tip portions are connected to the main body.

[0007] Furthermore, the driving liquid supply mechanism includes a screw feeder connected to the main body, and a driving motor connected to the screw feeder, the screw feeder includes a screw rod for connecting the driving motor and the main body, and a feeding piece arranged on the periphery of the screw rod and connected to the main body, and there is a gap between the feeding piece and the screw rod.

[0008] Furthermore, the electrospinning device further comprises a core layer liquid supply mechanism for delivering a core layer spinning solution to the tip portion, and the core layer liquid supply mechanism is connected to the feed member.

[0009] Furthermore, the liquid storage tank has an outlet for the chain transmission, the outlet is in a semi-closed state, and the liquid storage tank is arranged at an angle.

[0010] Furthermore, the electrospinning mechanism also includes a shell layer liquid supply mechanism connected to the liquid storage tank.

[0011] Furthermore, the receiving mechanism is a metal receiving plate, and the receiving plate is in an arc shape.

[0012] Further, the center of the arc-shaped receiving plate coincides with the center of the second gear, and the radius of the arc-shaped receiving plate is greater than the radius of the second gear.

[0013] Furthermore, the material of the second gear is conductive metal.

[0014] Furthermore, the shell layer spinning solution is different from the core layer spinning solution.

[0015] The beneficial effects of the present invention are as follows: by providing a first gear, a second gear and a chain connecting the first gear and the second gear, the second gear rotates under the drive of the liquid supply mechanism and then drives the chain and the first gear to rotate, so that the chain and the first gear stir the shell spinning solution in the liquid storage tank to prevent the shell spinning solution from solidifying, and at the same time bring out part of the shell spinning solution; the second gear has an opening tip for spraying the core spinning solution, when the chain is driven through the liquid storage tank, the shell spinning solution is stored in the pitch of the chain, and when the pitch moves to the opening tip, it meshes with the opening tip to form a structure similar to a coaxial spinning head, the shell spinning solution and the core spinning solution are simultaneously stretched into filaments under the action of the electrostatic field, thereby forming a jet to form a core-shell structure fiber, which improves the continuity and stability of spinning, and has a simple structure and is convenient and fast.

[0016] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic structural diagram of the electrospinning device of the present invention that can prepare core-shell structure nanofibers in batches.

[0018] Figure 2 Another schematic structural diagram of the electrospinning device of the present invention for batch preparation of core-shell structure nanofibers. DETAILED DESCRIPTION

[0019] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0020] See also Figure 1 and Figure 2 In a preferred embodiment of the present invention, an electrospinning device for batch preparation of core-shell structure nanofibers includes a liquid reservoir 1, a first gear 2 disposed in the liquid reservoir 1, a second gear 6 disposed outside the liquid reservoir 1, a chain 5 for connecting the first gear 2 and the second gear 6, and a driving liquid supply mechanism for driving the second gear 6 to rotate. The driving liquid supply mechanism drives the second gear 6 to rotate and then drives the chain 5 to rotate, so as to drive the first gear 2 in the liquid reservoir 1 to rotate, thereby stirring the spinning solution in the liquid reservoir 1 to prevent it from coagulating, and allowing the chain 5 to take out part of the spinning solution in the liquid reservoir 1. In this embodiment, the spinning solution placed in the liquid reservoir 1 is a shell spinning solution.

[0021] Among them, the liquid reservoir 1 has an outlet for the chain 5 to be driven, and the outlet is in a semi-closed state. The semi-closed outlet can prevent the organic solvent in the shell spinning solution from volatilizing too quickly, and can also block the interference of the core spinning solution. In addition, in this embodiment, the liquid reservoir 1 is tilted. With the direction of the first gear 2 as the front, the inclination direction of the liquid reservoir 1 is tilted from front to back and from bottom to top to prevent the shell spinning solution in the liquid reservoir 1 from flowing out of the outlet, causing waste of the shell spinning solution. Accordingly, in order to improve the spinning efficiency, the electrostatic spinning mechanism also includes a shell liquid supply mechanism 10 connected to the liquid reservoir 1.

[0022] The electrostatic spinning device also includes a high-voltage power supply 3 connected to the second gear 6, and a receiving mechanism 7 arranged on one side of the second gear 6 and grounded. An electrostatic field is formed between the second gear 6 and the receiving mechanism 7, and the electrostatic field is used to stretch the spinning solution into a jet and then be received on the receiving mechanism 7. Correspondingly, the material of the second gear 6 is a conductive metal, and the conductive metal can be iron, etc., which is not specifically limited here and depends on the actual situation. In this embodiment, the receiving mechanism 7 is a metal receiving plate 7, and the metal receiving plate 7 is arc-shaped. The purpose of setting the receiving plate 7 to an arc shape is to match the shape of the second gear 6, so that each similar coaxial spinning head structure has the same receiving distance to the metal receiving plate 7, so that the quality of the final formed nanofibers is relatively maintained at the same level. Specifically, the center of the arc-shaped receiving plate 7 coincides with the center of the second gear 6, and the radius of the arc-shaped receiving plate 7 is greater than the radius of the second gear 6.

[0023] Since the chain 5 is meshed with the first gear 2 and the second gear 6 respectively, the chain 5 has a pitch. After the chain 5 is transmitted through the liquid storage tank 1, part of the shell spinning solution will be taken out, so the shell spinning solution will be stored in the pitch. Correspondingly, the second gear 6 includes a plurality of opening tip portions for spraying the core spinning solution, and the opening tip portion is meshed with the chain 5. The chain 5 is transmitted through the liquid storage tank 1 so that part of the shell spinning solution is stored in the pitch of the chain 5. When the pitch with the shell spinning solution moves to the opening tip portion and meshes with the opening tip portion, a plurality of structures similar to coaxial spinning heads are formed. The shell spinning solution and the core spinning solution are stretched into a jet under the action of the electrostatic field to form a core-shell structure fiber until it is received on the receiving mechanism 7.

[0024] The second gear 6 also includes a hollow main body, and a plurality of opening tips are arranged in a ring shape on the main body, and the opening tips are connected to the main body. In this embodiment, the plurality of opening tips are equidistantly distributed on the circumference of the main body to better mesh with the chain 5. The driving liquid supply mechanism includes a screw feeder 8 connected to the main body, and a drive motor 9 docked with the screw feeder 8. The drive motor 9 is started to rotate the screw feeder 8, thereby driving the second gear 6 to rotate. Among them, the screw feeder 8 includes a screw rod for connecting the drive motor and the main body, and a feeder sleeved on the periphery of the screw rod and connected to the main body, and there is a gap between the feeder and the screw rod. The screw rod is rotatably connected to the main body and the drive motor, so that the drive motor drives the screw rod to rotate to drive the main body to rotate, and then the second gear 6 rotates. The feeder remains stationary relative to the screw rod, and the feeder is connected to the main body. Correspondingly, the electrospinning device further includes a core layer liquid supply mechanism 4 for delivering the core layer spinning solution to the tip portion, and the core layer liquid supply mechanism 4 is connected to the screw feeder 8, and specifically, the core layer liquid supply mechanism 4 is connected to the feed piece. The core layer liquid supply mechanism 4 delivers the core layer spinning solution to the main body through the feed piece and the screw rod until the core layer spinning solution fills the tip portion. It is worth noting that the shell layer spinning solution is different from the core layer spinning solution.

[0025] To sum up: by providing a first gear 2, a second gear 6 and a chain 5 for connecting the first gear 2 and the second gear 6, the second gear 6 rotates under the drive of the liquid supply mechanism and then drives the chain 5 and the first gear 2 to rotate, so that the chain 5 and the first gear 2 stir the shell spinning solution in the liquid storage tank 1 to prevent the shell spinning solution from solidifying, and at the same time bring out part of the shell spinning solution; the second gear 6 has an opening tip for spraying the core spinning solution. When the chain 5 is transmitted through the liquid storage tank 1, the shell spinning solution is stored in the pitch of the chain 5. When the pitch moves to the opening tip and meshes with the opening tip, a plurality of structures similar to coaxial spinning heads are formed. The shell spinning solution and the core spinning solution are simultaneously stretched into filaments under the action of the electrostatic field, thereby forming a jet to form core-shell structure fibers, thereby improving the spinning efficiency and output, and the structure is simple and convenient and fast.

[0026] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0027] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. An electrospinning device capable of batch-producing core-shell structure nanofibers, characterized in that: The invention comprises a liquid storage tank for placing a shell spinning solution, a first gear arranged in the liquid storage tank, a second gear arranged outside the liquid storage tank and connected to the first gear through a chain, a driving and liquid supplying mechanism for driving the second gear to rotate and supplying liquid to the second gear at the same time, a high-voltage power supply connected to the second gear, and a receiving mechanism arranged at one side of the second gear and grounded, wherein an electrostatic field is formed between the second gear and the receiving mechanism; The second gear includes a plurality of open tip portions for spraying the core layer spinning solution, and the tip portions are meshed with the chain. The chain is driven through the liquid storage tank so that the shell layer spinning solution is stored in the pitch of the chain. When the pitch carrying the shell layer spinning solution moves to the open tip portion and meshes with the open tip portion, the shell layer spinning solution and the core layer spinning solution form a jet under the action of the electrostatic field to form a core-shell structure fiber until it is received on the receiving mechanism.

2. The electrospinning device according to claim 1, characterized in that The second gear also includes a hollow main body, a plurality of opening tip portions are annularly arranged on the main body, and the opening tip portions are connected to the main body.

3. The electrospinning device according to claim 2, characterized in that The driving liquid supply mechanism includes a screw feeder connected to the main body and a driving motor connected to the screw feeder. The screw feeder includes a screw rod for connecting the driving motor and the main body, and a feeding piece sleeved on the periphery of the screw rod and connected to the main body, and there is a gap between the feeding piece and the screw rod.

4. The electrospinning device according to claim 3, characterized in that: The electrostatic spinning device further comprises a core layer liquid supply mechanism for delivering a core layer spinning solution to the tip portion, and the core layer liquid supply mechanism is connected to the feed member.

5. The electrospinning device according to claim 1, characterized in that: The liquid storage tank has an outlet for the chain transmission, the outlet is in a semi-closed state, and the liquid storage tank is arranged obliquely.

6. The electrospinning device according to claim 1, characterized in that The electrostatic spinning device also includes a shell layer liquid supply mechanism connected to the liquid storage tank.

7. The electrospinning device according to claim 1, characterized in that: The receiving mechanism is a metal receiving plate, and the receiving plate is in an arc shape.

8. The electrospinning device according to claim 7, characterized in that: The center of the arc-shaped receiving plate coincides with the center of the second gear, and the radius of the arc-shaped receiving plate is greater than the radius of the second gear.

9. The electrospinning device according to claim 1, characterized in that: The second gear is made of conductive metal.

10. The electrospinning device according to claim 1, characterized in that: The shell layer spinning solution is different from the core layer spinning solution.

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