CN210657228U

CN210657228U - Electrostatic spinning device

Info

Publication number: CN210657228U
Application number: CN201920503030.2U
Authority: CN
Inventors: 徐浙云; 高婷婷
Original assignee: Ningbo Fotile Kitchen Ware Co Ltd
Current assignee: Ningbo Fotile Kitchen Ware Co Ltd
Priority date: 2019-04-15
Filing date: 2019-04-15
Publication date: 2020-06-02
Anticipated expiration: 2029-04-15

Abstract

An electrostatic spinning device comprises a spinning device and a collector, wherein the spinning device is provided with a liquid spraying port for spinning, the collector is provided with a receiving end for receiving the spinning, a rotating shaft is arranged on the collector, and the collector rotates around the rotating shaft, so that the collecting distance between the receiving end of the collector and the liquid spraying port of the spinning device is periodically changed. Collecting the time that the change of the distance influences the electric field intensity and the separation and solidification of the nanometer fiber filaments to form a nanometer fiber film with random trend of the nanometer fiber filaments, different diameters and different deposition densities of the nanometer fiber filaments which are arranged at intervals; the preparation is convenient, the one-step molding is realized, and the subsequent treatment is not needed.

Description

Electrostatic spinning device

Technical Field

The utility model relates to an electrostatic spinning field, concretely relates to electrostatic spinning device.

Background

The electrospinning technology is a method for preparing the nanofiber membrane which is generally used at present. And carrying out jet spinning on the polymer solution or the melt in a strong electric field, and carrying out spinning and depositing on a collector to obtain the nanofiber membrane. The nanofiber membrane is composed of a plurality of nanofiber filaments.

In the direction of the nanofibrous filaments, the prior art is essentially in the final presentation form with a relatively uniform deposition of the nanofibrous filaments on the collector, with few others.

On the deposition density of the nano fiber filament, the deposition of the nano fiber filament in a specific area can be influenced by changing the process conditions, so that the regular change of the nano fiber film is realized. The most common method is to modify the electric field distribution, making use of the characteristic that the jet is sensitive to small differences in the local electric field. For example, using a conductive collection substrate (e.g., a screen or mesh) having a textured surface to form a patterned or textured nanofiber film, a method of forming three-dimensional nanostructures is disclosed in chinese patent application No. CN201810271656.5 (publication No. CN108385283A), for example, to create distinct regions having high and low nanofiber deposition densities. In addition, the collector can be partially covered by a non-conductive shelter, so that regular areas with different nanofiber silk deposition densities are formed, and the like. It can be seen that the prior art requires secondary processing of the collector, such as texturing, area coverage, etc., to affect the deposition density of the nanofiber filaments, which is time consuming and has a low fault tolerance.

However, relevant patents do not report an electrostatic spinning device that different nanofiber filaments are randomly oriented and the shape intervals on the plane of the nanofiber membrane are changed. The shape change mainly refers to the deposition density of the nanofiber filaments and the diameter intermittent regular change of the nanofiber filaments along the circumferential direction of the collector.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that to foretell technical current situation, provide a nanofiber silk trend random, different diameters and different deposition density's nanofiber silk interval arrangement's electrostatic spinning device.

The utility model provides a technical scheme that above-mentioned technical problem adopted does: an electrostatic spinning apparatus comprising a spinneret and a collector, said spinneret having a liquid spray opening for spinning and said collector having a receiving end for receiving the spun yarn, wherein: the collector is provided with a rotating shaft, and the collector rotates around the rotating shaft, so that the collecting distance between the receiving end of the collector and the liquid spraying port of the spinning device is periodically changed.

There are various configurations for the periodic variation of the collection distance, and preferably the collector extends radially outwardly with one or more projections.

In order to make the intervals of the nano fiber filaments with different deposition densities equal, the bulges are provided with a plurality of bulges which are uniformly distributed along the circumferential direction of the collector.

In order to make the diameters of the nanofiber filaments corresponding to different bulges the same, the bulges are provided with a plurality of shapes and sizes which are the same.

There may be a plurality of projections, preferably 3 projections, and the collector has a triangular cross-section.

There may be a plurality of projections, preferably 5 projections, and the collector has a pentagonal cross section.

As an improvement, the electrostatic spinning device further comprises a high-voltage power supply, the spinning nozzle is connected with the positive electrode of the high-voltage power supply, and the collector is connected with the negative electrode of the high-voltage power supply or grounded.

Compared with the prior art, the utility model has the advantages of: the collector rotates around the rotating shaft, the collecting distance between the receiving end of the collector and a liquid spraying opening of the spinneret periodically changes, and the collecting distance influences the final forming of the nanofiber filaments from two aspects, firstly, the change of the collecting distance influences the electric field strength, the electric field strength is equal to voltage/collecting distance, the larger the collecting distance is, the smaller the electric field strength is, the lower the degree of stretching of the nanofiber filaments in the collecting distance is, and therefore the forming of the nanofiber filaments is influenced; secondly, the change of the collecting distance influences the time for separating and curing the nanofiber filaments, and the longer the collecting distance is, the longer the separating and curing time is, so that the molding of the nanofiber filaments is influenced; so as to finally form the nanofiber membrane with nanofiber filaments having random trends, different diameters and different deposition densities and arranged at intervals; the nanofiber membrane is convenient to prepare, is formed at one time, and does not need subsequent treatment; the specific structural form of the nanofiber membrane is obtained by changing the physical shape of the collector, and the change of the prior art is small, so the implementation difficulty is small, the method is convenient and fast, and the cost is low; the formula of the selected material is basically not limited, and the material has universality.

Drawings

Fig. 1 is a schematic view of embodiment 1 of the present invention;

fig. 2 is a schematic view of a collector of embodiment 1 of the present invention;

FIG. 3 is a graph of the angle traversed by the collector of FIG. 2 versus the collection distance;

FIG. 4 is a schematic structural view of the nanofiber membrane of FIG. 2;

FIG. 5 is an electron microscope image of the portion of FIG. 4 where the density of deposited nanofiber filaments is low (after 30min of nanofiber filament deposition);

FIG. 6 is an electron microscope image of the portion of FIG. 4 where the density of deposited nanofiber filaments is greater (after 30min of nanofiber filament deposition);

fig. 7 is a schematic view of a collector of embodiment 2 of the present invention;

FIG. 8 is a graph of the angle of rotation versus the collection distance of the collector of FIG. 7;

fig. 9 is a schematic structural view of the nanofiber membrane of fig. 7.

Detailed Description

The present invention will be described in further detail with reference to the following embodiments.

Example 1:

as shown in fig. 1 to 6, the electrostatic spinning apparatus in this embodiment includes a spinneret 2 and a collector 3, the spinneret 2 has a liquid jet 21 for spinning, the collector 3 has a receiving end 3a for receiving the spinning, a rotating shaft 31 is provided on the collector 3, and the collector 3 rotates around the rotating shaft 31, so that a collecting distance D between the receiving end 3a of the collector 3 and the liquid jet 21 of the spinneret 2 changes periodically. The embodiment also comprises a high-voltage power supply 1, wherein the spinning nozzle 2 is connected with the anode of the high-voltage power supply 1, the collector 3 is connected with the cathode of the high-voltage power supply 1 or grounded, and a high-voltage electrostatic field is formed between the spinning nozzle 2 and the collector 3.

Preferably, the collector 3 extends radially outwards with one or more projections 32. When the projections 32 are plural, the plural projections 32 are uniformly distributed along the circumferential direction of the collector 3. The plurality of projections 32 are all the same in shape and size. In the present embodiment, there are 3 protrusions 32, the cross section of the collector 3 is triangular, and referring to fig. 2, the relationship between the angle δ that the collector 3 rotates from the starting position 33 (the position where the receiving end 3a of the collector 3 is closest to the liquid discharge port 21 is the starting position, and the collecting distance D is the smallest at this time) and the corresponding collecting distance D is as shown in fig. 3, and the collecting distance D changes periodically with the change of the rotated angle δ. The size of the collection distance D and the number of intervals of areas of different deposition density of the nanofiber membrane are regularly adjusted by the change of the shape of the collector 3 (the number and angle of the convex corners).

Fig. 5 is a graph of lower nanofiber filament deposition density. Fig. 6 is a graph of greater nanofiber filament deposition density. In fig. 5, the diameter of a single nanofiber filament is small, and the deposition density of the nanofiber filament is small (i.e. the pores between nanofiber filaments are large). In fig. 6, the diameter of a single nanofiber filament is larger, and the deposition density of the nanofiber filament is larger (i.e. the pores between the nanofiber filaments are smaller).

The nanofiber membrane of the embodiment has a wide application prospect, such as in fluid concentration distribution generators, directional wetting, cell culture, tissue engineering and the like.

In example 1, the principle of use of this electrospinning device is as follows.

The spun yarn discharged from the liquid discharge port 21 is deposited on the collector 3 by the action of the high-voltage electrostatic field. In the process that the collector 3 with the triangular cross section rotates by a certain angle delta, the collecting distance D between the receiving end 3a and the liquid spraying opening 21 changes periodically. The variation of the collecting distance D affects the electric field intensity and the formation of the nanofibers, and finally, nanofiber membranes in which nanofibers with random orientations, different diameters and different deposition densities are arranged at intervals are formed, as shown in fig. 4.

Example 2:

referring to fig. 7 to 9, the structure is substantially the same as that of embodiment 1 except that: the projections 32 have 5 projections and the cross section of the collector 3 is pentagonal, see fig. 7. Likewise, the relationship between the angle δ through which the collector 3 is rotated from the starting position 33 and the corresponding collection distance D is shown in fig. 8, and finally the nanofiber membrane structure, see fig. 9.

In example 2, the electrostatic spinning apparatus was used in the same manner as in example 1.

Claims

1. An electrostatic spinning apparatus comprising a spinning nozzle (2) and a collector (3), said spinning nozzle (2) having a liquid jet (21) for spinning, said collector (3) having a receiving end (3a) for receiving the spun yarn, characterized in that: the collector (3) is provided with a rotating shaft (31), and the collector (3) rotates around the rotating shaft (31), so that the collecting distance (D) between the receiving end (3a) of the collector (3) and the liquid spraying opening (21) of the spinning jet (2) is periodically changed.

2. The electrospinning apparatus of claim 1, wherein: the collector (3) extends radially outwards with one or more protrusions (32).

3. The electrospinning apparatus of claim 2, wherein: the protrusions (32) are provided with a plurality of protrusions (32), and the protrusions (32) are uniformly distributed along the circumferential direction of the collector (3).

4. An electrospinning device according to claim 2 or 3, wherein: the protrusions (32) are provided in plurality, and the plurality of protrusions (32) are identical in shape and size.

5. The electrospinning apparatus of claim 4, wherein: the number of the protrusions (32) is 3, and the cross section of the collector (3) is triangular.

6. The electrospinning apparatus of claim 4, wherein: the number of the protrusions (32) is 5, and the cross section of the collector (3) is pentagonal.

7. The electrospinning apparatus of claim 1, wherein: the electrostatic spinning device further comprises a high-voltage power supply (1), the spinning sprayer (2) is connected with the positive pole of the high-voltage power supply (1), and the collector (3) is connected with the negative pole of the high-voltage power supply (1) or grounded.