Electrostatic spinning device and method for preparing nanofiber in macroscopic quantity

Abstract

The invention relates to an electrostatic spinning device and method for preparing nanofiber in macroscopic quantity, belonging to the technical field of electrostatic spinning. The electrostatic spinning device for preparing the nanofiber in macroscopic quantity is characterized by consisting of a high-voltage static electricity generating device, more than one jet-flow generating device and a fiber collecting device, a positive high-voltage static electricity generator is connected with the spinning shaft of the jet-flow generating device, and a negative high-voltage static electricity generator is connected with the support plate of the fiber collecting device; the jet-flow generating device comprises a semi-cylindrical liquid storage tank, a rotational spinning shaft installed in the liquid storage tank, a liquid supplying module connected with the liquid storage tank and a power module for driving the spinning shaft to rotate, wherein the spinning shaft is cylindrical, and cones,which are radially distributed with shaft centers facing outwards, are arranged on shaft bodies; the fiber collecting device can be used for adjusting a relative distance with the jet-flow generatingdevice up and down. The requirement on voltage is reduced, the nanofiber preparation efficiency can be improved by a large margin, and fiber mesh structures, which have different shapes and differentporosities, can be obtained.

Description

technical field [0001] The invention relates to an electrostatic spinning device for preparing nanofibers in a large amount, in particular to an electrostatic spinning device and method for preparing nanofibers in a large amount. Background technique [0002] Electrospinning is a new technology for preparing nanofibers that has been widely researched, developed and used in the past ten years. It has the characteristics of simple operation process and wide applicability. The specific principle is to form the prepared polymer composite solution into a jet , under the stretching effect of the high-voltage electric field and the repulsion of the internal charges of the jet, the jet is thinned and split, and finally forms nanofibers and deposits on the collecting device. [0003] There are two main types of electrospinning technologies currently in use. One is the needle-type electrospinning technology. The solution is sprayed out through the spinneret in the needle to form a jet...

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Problems solved by technology

[0003] There are two main types of electrospinning technologies currently in use. One is the needle-type electrospinning technology. The solution is sprayed out through the spinneret in the needle to form a jet. The disadvantage is that the single-needle spinning efficiency is low and the number of needles is increased. Although the spinning output can be increased, the limitation of the needle spacing will cause problems such as bulky equipment, uneven electric field distribution, and continuous fiber production, and the spinning needles are easy to block and difficult to clean; the second is the needle-free electrospinning technology, which enables The jet is formed spontaneously on the surface of the free liquid without the influence of capillary force, which greatly improves the output and realizes the mass production of fibers, but the voltage required to generate the electric field is high, and the shape of the electrode will affect the voltage and the spinning area. The electric field distribution has a certain influence

And both electrospinning technologies use a stationary metal plate or conductor as a collection device. The disadvantage is that it is inconvenient and ineffective in continuous spinning, height adjustment of the forming area and collection of nanofibers, and even the presence of nanofibers The problems of short-term repeated coating and long-term non-coating eventually lead to disordered arrangement of the collected nanofiber microstructure, poor firmness and strength

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