CN104451908A - Linear nozzle for electrostatic spinning - Google Patents

Abstract

The utility model relates to a linear nozzle for electrospinning, which relates to an electrospinning nozzle. Provides a linear nozzle for electrospinning that can improve the productivity of electrospinning equipment and the uniformity of the thickness of the spun fiber film without nozzle clogging. A conductive thread support, a conductive thread, and a solution feeding mechanism are provided; the conductive thread is fixedly connected to the conductive thread support, and the solution feeding mechanism is used to evenly coat the spinning solution on the conductive thread. During spinning, the conductive filament is connected to the positive pole of the high-voltage DC power supply, and the spinning collection plate is connected to the negative pole of the high-voltage DC power supply. The solution is uniformly coated on the surface of the linear conductive filament by the solution feeding mechanism, and the solution on the conductive filament forms an electrospinning process under electrostatic force. At the same time, the solution feeding mechanism continuously coats the solution on the conductive wire. The utility model has the advantages of simple structure, low cost, high efficiency and the like.

Description

Linear nozzles for electrospinning

technical field

The invention relates to an electrostatic spinning nozzle, in particular to a linear nozzle for electrostatic spinning.

Background technique

With the continuous development of nanotechnology in recent years, electrospinning has become an important method for preparing nanofibers and has attracted much attention. The electrospinning method is widely used, from industrial synthetic polymers to cellulose, collagen, protein, DNA complexes and other raw materials can be spun, and antibiotics, nanoparticles, etc. can be added during the spinning process , to prepare various functional fibers.

The traditional electrospinning technology is the most widely used technology for preparing nanofibers. It uses a high-voltage electrostatic generator to generate thousands of volts or even tens of kilovolts of high-voltage static electricity to apply pressure in the polymer solution or melt, making the tip of the needle The droplet deforms to form a Taylor cone. When the electric field force reaches a critical value, the surface tension can be overcome, and the jet is ejected, and the jet is wound and bent in the electric field, and finally solidified on the receiving plate. However, in traditional electrospinning, the output of electrospinning with needle-tip nozzles is small. Although the use of multi-tip nozzles can increase the output to a certain extent, due to the small distance between the spinnerets, it is easy to Electrostatic interference is generated, making the spinning process unstable, and some spinnerets do not spin. Low yield and poor uniformity are the main reasons why electrospinning cannot be mass-produced or applied in a large scale. Literature [1] ([1]OODosunmu, GGChase, WKataphinan, et al.Nanotechnology.2006; 11:1123-7.) prepared nanofibers with a porous tube as a nozzle, and the yield of this method is higher than that of traditional electrospinning increased by about 250 times. However, the preparation process of this method is unstable, and the problem of clogging of porous tubes is also difficult to solve. Chinese patent CN200810153891.9 reports a non-woven non-batch electrospinning device, which uses a metal cylinder immersed in a polymer solution and cast with a tapered thread as the nozzle to replace the traditional needle-point nozzle for spinning. Although it is significantly improved, it has the disadvantage of high injection voltage threshold and cannot spin nanofibers containing two substances at the same time.

Contents of the invention

The purpose of the present invention is to provide a linear nozzle for electrospinning that can improve the productivity of the electrospinning equipment and the uniformity of the thickness of the spun fiber film without nozzle clogging.

The invention is provided with a conductive thread support, a conductive thread, and a solution feeding mechanism; the conductive thread is fixedly connected to the conductive thread support, and the solution feeding mechanism is used to evenly coat the spinning solution on the conductive thread.

The shape of the conductive thread can be straight line, arc, spiral, circle or ellipse and so on.

The conductive thread adopts a linear conductive thread, and the intuitive structure is a continuous, smooth transition curve without obvious knuckles. After the linear conductive filament curve is equivalent to a mathematical language description, any section of the curve intercepted on the conductive filament curve is a continuous conductive curve.

The diameter of the conductive wire can be ≤2mm.

During spinning, the conductive filament is connected to the positive pole of the high-voltage DC power supply, and the spinning collection plate is connected to the negative pole of the high-voltage DC power supply. The solution is uniformly coated on the surface of the linear conductive filament by the solution feeding mechanism, and the solution on the conductive filament forms an electrospinning process under electrostatic force. At the same time, the solution feeding mechanism continuously coats the solution on the conductive wire.

The invention aims at the insufficient yield of the existing electrospinning equipment and the low uniformity of the thickness of the spun fiber film, and provides an electrospinning nozzle which can be used for large-scale preparation of the nanofiber film. The invention has the advantages of simple structure, low cost, high efficiency and the like.

Description of drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present invention.

Detailed ways

Referring to Fig. 1, the embodiment of the present invention is provided with conductive wire support 1, conductive wire 2, solution feeding mechanism 3; The spinning solution is uniformly coated on the conductive filament 2 .

The shape of the conductive thread 2 can be straight line, arc, helical circle, circle or ellipse and so on.

The conductive thread adopts a linear conductive thread, and the intuitive structure is a continuous, smooth transition curve without obvious knuckles. After the linear conductive filament curve is equivalent to a mathematical language description, any section of the curve intercepted on the conductive filament curve is a continuous conductive curve.

The diameter of the conductive wire can be ≤2mm.

Claims (4)

1. the linear shower nozzle of electrostatic spinning, is characterized in that being provided with conductive filament support, conductive filament, solution feed mechanism; Conductive filament and conductive filament support are connected, and solution feed mechanism is for being evenly coated in conductive filament by spinning solution.

2. the linear shower nozzle of electrostatic spinning as claimed in claim 1, is characterized in that the shape of described conductive filament is straight line, camber line, spiral coil, circle or oval.

3. the linear shower nozzle of electrostatic spinning as claimed in claim 2, is characterized in that described conductive filament adopts linear conductance silk, visual texture be continuous print, transition smooth, without the curve of obvious knuckle.

4. the linear shower nozzle of electrostatic spinning as claimed in claim 1, is characterized in that the diameter≤2mm of described conductive filament.