Outer conical surface type electrostatic spinning sprayer assisted by airflow

Abstract

The invention discloses an outer conical surface type electrostatic spinning sprayer assisted by airflow, and belongs to thee field of electrostatic spinning. The device comprises a fiber receiving plate, an outer conical surface airflow guide tube, a machine head, a screw, a positioning nut, a material barrel, a material barrel fixing block, a heating ring, a temperature sensor, a grounding electrode, a high-voltage electrostatic generator and the like, flux is evenly distributed to the conical surface sprayer through a flow channel on the outer wall of the airflow guide tube, a flux film naturally thins in the forming process under the action of gravity and adhesive power, the flux forms a Taylor cone at the tip end of the outer conical surface under the action of high-voltage static, and therefore jet flow spinning is formed. Due to the fact that the flux film thins, the diameters of fibers can be effectively reduced, the fibers are further stretched under the action of high-speed airflow, fiber bundles are made to converge inwards due to internal and external pressure difference formed by the high-speed airflow, the density distribution of the fibers is effectively improved, the device can also be used for eliminating interference of the high-speed airflow on the flux film, and the diameters of the fibers can be more uniform.

Description

technical field [0001] The invention relates to an airflow-assisted outer cone electrostatic spinning nozzle, which belongs to the field of electrostatic spinning. Background technique [0002] With the heating up of nanotechnology, electrospinning method has become one of the current research hotspots because it can prepare nanoscale fibers. The electrospinning method has been recognized as the simplest and most effective method for preparing nanofibers. At present, more than 30 kinds of polymers have successfully prepared ultrafine fibers through this method, and the smallest diameter reaches tens of nanometers. [0003] The basic principle of melt electrospinning is that the melt gradually deforms under the action of a high-voltage electrostatic field after passing through the spinneret hole. When the electric field force is greater than the surface tension of the melt, the melt at the end of the spinneret hole will fight for its The surface tension forms a high-speed me...

AI Technical Summary

Problems solved by technology

[0006] The present invention proposes an airflow-assisted outer cone type electrospinning nozzle. Due to the use of the outer cone type nozzle, the melt flows on the cone surface to form a melt film under the action of gravity and adhesion. Natural thinning, thereby reducing the diameter of the fiber, and preventing the melt from being affected by the high-speed air flow in the middle during the film formation process, solving the problem of uneven distribution of the melt affected by the air flow and fiber disturbance at the tip, thus solving the problem of The problem of uneven distribution of fiber diameter and size. During the spinning process, the internal and external pressure difference formed by the high-speed airflow can make the spun fiber bundles gather inwards to achieve the purpose of increasing the fiber distribution density.

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