Supercritical fluid auxiliary melt differential electrostatic spinning device

Abstract

The invention discloses a supercritical fluid auxiliary melt differential electrostatic spinning device which is composed of a feeding system, a supercritical fluid supply system, a fluid mixing system, a pressure relief system, a spinning system and a winding roller. The pressure relief system is composed of a melt outlet valve, a pressure relief kettle, a pressure reducing valve and a stirring device, the spinning system is composed of a nozzle, an electrode plate, an electrode plate support and a high-voltage electrostatic power source, and the collecting roller is located behind the electrode plate and receives fibers generated by the nozzle. According to the device, the supercritical fluid and the melt are stirred and mixed in the high-pressure stirring kettle through the multiple sets of blades to form a uniform blend, the viscosity of the melt is reduced through the supercritical fluid, bubbles wrapped by the melt are broken, the melt at the broken position is differentiated into fibers, and the blend has a large pressure difference with the external environment, so that the melt is dispersed in the melt, and the melt is dispersed in the melt. The stretching degree of the fiber can be greatly improved, the diameter of the fiber is reduced, and uniform and stable preparation of the nanofiber is realized.

Description

technical field [0001] The invention relates to a supercritical fluid assisted melt differential electrostatic spinning device, which belongs to the field of electrostatic spinning. Background technique [0002] Electrospinning technology is currently the most commonly used technology for preparing micro-nano fibers. According to different raw materials, it can be divided into solution electrospinning and melt electrospinning. Compared with solution electrospinning, melt electrospinning has the advantages of unnecessary It has the advantages of using toxic solvents, high utilization rate of raw materials, environmental protection and no pollution, and is suitable for high polymers such as PP and PLA with a large amount and a wide range. However, due to the high viscosity of the polymer melt, the traditional single-needle melt electrospinning has the problems of easy blockage of the nozzle and low fiber preparation efficiency. In response to this problem, Yang et al. develop...

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Problems solved by technology

However, due to the high viscosity of the polymer melt, the traditional single-needle melt electrospinning has the problems of easy blockage of the nozzle and low fiber preparation efficiency.

In response to this problem, Yang et al. developed a melt differential electrospinning device (US20160068999A1 MeltDifferential Electrospinning Device and Process) using an open cone as a nozzle, which solved the problem of low production efficiency of melt electrospun fibers

In addition, Yang et al. obtained nanoscale fibers by melt differential electrospinning by blending plasticizers with the melt, but the fibers were affected by plasticizers and had poor mechanical properties.

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