Electrostatic spinning device for preparing nano-fibers on large scale

Abstract

The invention discloses an electrostatic spinning device for preparing nano-fibers on a large scale. According to the electrostatic spinning device, a straightened metal chain serves as a fiber emitting electrode, the metal chain is connected with a positive electrode of a high-voltage direct current power source, a collector is arranged over the metal chain, the collector is connected with a negative electrode of the high-voltage direct current power source or grounded, a power supply system for jetting airflow upwards is arranged under the metal chain, and a liquid supply system for applying a spinning precursor solution to the metal chain is arranged on the metal chain. The device is simple in operation, the electrospinning fiber efficiency can be remarkably improved, electrospinning fibers with the uniform diameter are obtained, and large-scale production of the micro-nano fibers is achieved.

Description

technical field [0001] The invention belongs to the technical field of preparation of micro-nano materials, and in particular relates to an electrostatic spinning device for large-scale preparation of micro-nano fibers. Background technique [0002] Electrospinning technology was first proposed by Formhals in 1934. It is currently recognized as a representative technology for the preparation of one-dimensional nanofiber materials. Charged jet, the jet is stretched, split, thinned, solvent volatilized or melt solidified to form micro-nano fibers. At present, more than 200 types of fibers can be prepared by electrospinning technology, including a variety of natural biological materials, synthetic biological materials and non-biological materials; the prepared fibers have strong mechanical properties, high porosity, good air permeability, large specific surface area, and surface Various performance advantages such as strong activity; optimizing the electrospinning device can a...

AI Technical Summary

Problems solved by technology

So far, people have done a lot of theoretical research work on electrospinning technology, which has confirmed the theoretical feasibility of electrospinning technology application transformation, but its practical transformation process still faces many problems: 1) The productivity of traditional single-needle electrospinning technology Low (0.1-1g / h), the jet flow produced by a single needle is limited, and it is difficult to meet the industrial application requirements of electrospun fibers; 2) The spinning needle is prone to needle clogging during the electrospinning process, and the rapid volatilization of the solvent causes the needle tip solution to solidify , the needles are clogged, the spinning process cannot be carried out smoothly, frequent cleaning work makes the whole electrospinning process complicated and cumbersome, and for multi-needle electrospinning technology, it is almost unrealistic to clean the needles; 3) multi-needle electrospinning technology There is a strong repulsion between the needle jets, and the fibers are deposited in different regions on the collector, resulting in uneven thickness of the non-woven fabric, which directly affects the performance of fiber processed products

Jirsak et al. used a rotating drum half-immersed in the spinning solution as a fiber generator to significantly increase the yield of electrospun fibers. This technology uses an open spinning solution system, and the spinning precursor solution is exposed to the air in a large area. The solvent is very volatile during the electrospinning process, and the concentration of the spinning solution is unstable, resulting in uneven thickness of the electrospun fibers, which directly affects the performance of its fiber products

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