Method and device for preparing gradient structure short fiber felt

Abstract

Provided is a method for preparing a gradient structure short fiber felt. The method comprises the following steps of step 1, setting up a preparation device; step 2, setting the total flow rate of aliquid pump and the frequency of droplet generation; step 3, turning on a high voltage static generator, and generating a high voltage electrostatic field between an electrode plate and a substrate; step 4, turning on a fan, and creating a horizontal wind field between the electrode plate and the substrate; step 5, moving a conveying device from left to right, wherein the gradient structure shortfiber felt is deposited on the substrate conveyed from the conveying device, the upper surface loosely, upwardly and continuously transitions to a lower surface dense gradient structure, the length ofa single fiber is 0.5 mm-5 mm, and a short fiber felt has a single fiber diameter of 50nanometers-5microns. A device for preparing a gradient structure short fiber felt is provided, and the device comprises a spray head, an electrode holder, the electrode plate, the liquid pump, the liquid storage tank, the conveying device, the substrate, the high voltage electrostatic generator and the fan. Thepreparation process of the method is simplified, and the transition of the fiber felt gradient structure is continuous.

Description

technical field [0001] The invention relates to the technical field of short-fiber mat preparation, in particular to a preparation method and device for a gradient-structure short-fiber mat. Background technique [0002] Nano-short fiber membranes have great applications in the fields of filtration, catalysis, and medicine. Nano-short fibers have a large specific surface area, exhibit good filtration characteristics, can effectively filter micro-nano particles, and also have good strength and rigidity, easy dispersion, and good processing performance. Fibers with diameters at the nanometer level can effectively filter submicron or nanometer particles. In particular, when the fiber membrane presents a diameter gradient structure, the range of particles that can be filtered is wider and the efficiency is higher. [0003] Electrospinning technology is one of the important methods for preparing nanofibers. Its principle can be summarized as follows: the droplets of spinning sol...

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Problems solved by technology

[0006] In order to overcome the disadvantages of complex preparation process and discontinuous transition of fiber mat gradient structure in the existing electrospinning method, the present invention provides a method for preparing short fiber mat with gradient structure, which solves the problem of complex preparation process and gradient structure of fiber mat in the prior art. Issues such as transition discontinuity

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