CN105113029A - Linear nozzle for electrostatic spinning - Google Patents

Abstract

The utility model relates to a linear nozzle for electrospinning, which relates to an electrospinning nozzle. It is equipped with a solution tank, a rotating shaft, a spiral metal ring, a support seat, and a driving device; the upper surface of the solution tank is open, and the rotating shaft is arranged above the solution tank. The rotating shaft can conduct electricity and is externally connected to a high-voltage electrostatic generating device. The left and right sides of the rotating shaft are respectively fixed on the supporting base, and the rotating shaft is fixedly connected with both ends of the helical metal ring and is located at the axial center of the helical metal ring. In view of the insufficient yield of existing electrospinning equipment and the low uniformity of the thickness of the spun fiber film, an electrospinning nozzle that can be used for large-scale preparation of nanofiber films is proposed. It has the characteristics of simple structure, low cost and high efficiency. The spinning yield is greatly improved compared with the traditional needle-point electrospinning nozzle, there is no problem of nozzle clogging, and the thickness of the spun nanofiber film is relatively high.

Description

Linear nozzles for electrospinning

technical field

The invention relates to an electrostatic spinning nozzle, in particular to a linear nozzle for electrostatic spinning which can be used for large-scale spinning.

Background technique

Nanofiber manufacturing and application technology is the focus of cutting-edge science and technology in recent years. In the fields of information, biology, environment, etc., nanofiber technology has a great impact on the industry. With the development of nanotechnology, electrospinning technology, as an effective and practical method for preparing nanofibers, has attracted increasing attention in the field of nanomaterials research. As early as 1934, Formhals invented a device that uses an electrostatic field to produce polymer ultrafine fibers. However, until recent years with the development of modern science and technology and the rise of nanotechnology, electrospinning technology has not been more in-depth research and has achieved great development. Many research groups have shown great interest in electrospinning and reported a series of organic polymer fibers prepared by this technique.

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, etal.Nanotechnology.2006; 11:1123-7.) prepared nanofibers with a porous tube as a nozzle, and the output of this method is higher than that of traditional electrospinning. About 250 times. However, the preparation process of this method is unstable, and the problem of porous tube clogging 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 it cannot spin nanofibers containing two substances at the same time.

Contents of the invention

The purpose of the present invention is to provide a spinning nozzle device that can improve the productivity of electrostatic spinning equipment and the uniformity of the thickness of the spun fiber film.

The invention is provided with a solution tank, a rotating shaft, a spiral metal ring, a support seat, and a driving device; the upper surface of the solution tank is open, and the rotating shaft is arranged above the solution tank. connection, the left and right sides of the rotating shaft are respectively fixed on the supporting base, and the rotating shaft is fixedly connected with both ends of the spiral metal ring and is located at the axis of the spiral metal ring.

The rotating shaft can be made of metal material, and the rotation speed of the rotating shaft can be 5-15 r/min.

The supporting seat can be made of insulating material, and the supporting seat is connected with the rotating shaft by ceramic bearings.

The spiral metal ring can be wound into a spring shape by a metal wire with a diameter of 1-5 mm, and the diameter of the spiral metal ring can be 40-200 mm.

Aiming at the insufficient productivity of the existing electrospinning equipment and the low uniformity of the thickness of the spun fiber film, the invention proposes an electrospinning nozzle which can be used for large-scale preparation of the nanofiber film. The invention has the characteristics of simple structure, low cost, high efficiency and the like. By using the invention for spinning, the productivity is greatly improved compared with the traditional needle-point electrospinning nozzle, there is no problem of nozzle clogging, and the thickness of the spun nanofiber film is relatively high.

Description of drawings

Fig. 1 is one of the three-dimensional schematic diagrams of the structure of the embodiment of the present invention.

Fig. 2 is the second perspective view of the structure of the embodiment of the present invention.

Fig. 3 is a schematic diagram of the structure of the helical metal coil according to the embodiment of the present invention.

Detailed ways

1 to 3, the embodiment of the present invention is provided with a solution tank 1, a rotating shaft 2, a spiral metal ring 3, a support seat 4, and a driving device 5; the upper surface of the solution tank 1 is open, and the rotating shaft 2 is arranged above the solution tank 1, The rotating shaft can conduct electricity and is externally connected with a high-voltage electrostatic generating device. Both ends of the rotating shaft 2 are connected to the driving device 5. The left and right sides of the rotating shaft 2 are respectively fixed on the support base 4. The two ends of the rotating shaft 2 and the spiral metal ring 3 are fixedly connected and located on the spiral metal ring 3 axis position.

The rotating shaft can be made of metal material, and the rotation speed of the rotating shaft can be 5-15 r/min.

The supporting seat can be made of insulating material, and the supporting seat is connected with the rotating shaft by ceramic bearings.

The spiral metal ring can be wound into a spring shape by a metal wire with a diameter of 1-5 mm, and the diameter of the spiral metal ring can be 40-200 mm.

When adopting the spinning of the present invention, comprise the following steps:

1) Pour the prepared spinning solution into the solution tank;

2) Connect the positive pole of the high-voltage electrostatic generating device to the rotating shaft, and the negative pole to the receiving device;

3) Start the driving device to drive the rotating shaft and drive the spiral metal ring to rotate;

4) Confirm that 1/5 to 1/3 of the spiral metal ring can be immersed in the liquid in the solution tank;

5) Start the high-voltage electrostatic generating device, adjust the output voltage, and start electrospinning;

6) producing nanofibers on a receiving device;

7) Turn off the high-voltage electrostatic generating device first, then turn off the driving device, and remove the nanofiber on the receiving device;

8) Spinning ends.

Claims (5)

1. A linear nozzle for electrospinning, characterized in that it is provided with a solution tank, a rotating shaft, a spiral metal ring, a support seat, and a driving device; the upper surface of the solution tank is open, and the rotating shaft is arranged above the solution tank, and the rotating shaft is conductive and externally connected to high voltage In the static electricity generating device, both ends of the rotating shaft are connected with the driving device, the left and right sides of the rotating shaft are respectively fixed on the supporting base, and the rotating shaft is fixedly connected with the two ends of the spiral metal ring and is located at the axial center of the spiral metal ring. 2. The linear nozzle for electrospinning according to claim 1, wherein the rotating shaft is made of metal material. 3. The linear nozzle for electrospinning according to claim 1, characterized in that the rotation speed of the rotating shaft is 5-15 r/min. 4. The linear nozzle for electrospinning according to claim 1, wherein the support base is made of insulating material, and the support base and the rotating shaft are connected by ceramic bearings. 5 . The linear nozzle for electrospinning according to claim 1 , wherein the helical metal ring is wound into a spring shape by a metal wire with a diameter of 1 to 5 mm, and the diameter of the helical metal ring is 40 to 200 mm.