System for preparing nanofibers on large scale by utilizing electrostatic spinning process and preparation method

Abstract

The invention discloses a system for preparing nanofibers on a large scale by utilizing the electrostatic spinning process and a preparation method. The system comprises a vertical electrostatic spinning device, a substrate layer is arranged on the top of the vertical electrostatic spinning device, both ends of the substrate layer are respectively wound on a roller, both rollers are connected with motors, a collector is arranged on the top of the substrate layer, the vertical electrostatic spinning device comprises a reservoir, a lower needle plate and an upper needle plate are arranged in the reservoir, both ends of the two needle plates are respectively connected with a link mechanism through limit wheels, one end of the link mechanism is connected with a cam driving mechanism, the other end of the link mechanism is connected with a spring, spinning jets are arranged on the needle plates, metal electrodes are arranged on the bottom of the reservoir, and are connected with the anode of a direct-current high voltage generator and the lower ends of the spinning jets, and the cathode of the direct-current high voltage generator is grounded and connected with the collector. The invention also discloses the method for preparing nanofibers by utilizing the system. The system has a simple structure and high expansibility, the diameter uniformity of the prepared nanofibers is good, and the nanofibers can be widely used in fields, such as filtration, medical chemical and energy.

Description

technical field [0001] The invention belongs to the technical field of electrospinning, and relates to a device for large-scale preparation of nanofibers by using an electrospinning process, and also relates to a method for preparing nanofibers by using the above device. Background technique [0002] Nanofibers have a large specific surface area and length-to-diameter ratio, fine microstructure, high porosity, strong interpenetration with other substances, excellent flexibility, adsorption, filterability, and adhesion And thermal insulation, as well as force, light, electricity, heat, magnetic and other properties. These remarkable properties make nanofibers have great application prospects in many important fields, such as: super filter materials, ion exchange system absorption and separation materials, tail gas and industrial sewage treatment materials, gas masks, protective clothing, waterproof and breathable fabrics, sound-absorbing materials, etc. Noise materials, comp...

AI Technical Summary

Problems solved by technology

[0005] The above methods have achieved varying degrees of success in increasing the yield of nanofibers, but they also have the following defects: For the multi-needle method, the distance between the needles should not be too small, otherwise it will easily form electrostatic interference between the jets and affect the volatilization of the solvent and the refinement of fiber diameter, and may cause needle clogging, and the number and position of needles are relatively fixed, which cannot be changed according to actual needs, and the quality of the obtained nanofiber web is relatively simple; The position is not fixed, and the convex curvature is unstable, so that the diameter uniformity of the final nanofiber is poor

In the porous tube method, although the position of the Taylor cone is relatively fixed, and the curvature of the droplet tip is relatively stable, the collection method is deposited along the circumferential direction, which limits the increase in the area of ​​the nanofibrous web.

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