A brush-fed needle-free electrospinning device and method

Abstract

The invention discloses a hairbrush feeding type needle-free electrostatic spinning device and method. The hairbrush feeding type needle-free electrostatic spinning device mainly comprises a rotating spraying head, a receiving plate, a U-type support, a hairbrush feeding system, a baffle, a motor and an electrostatic generator. The U-type support is composed of a U-type groove and supporting bearings, and the rotating spraying head is arranged on the supporting bearings. The hairbrush feeding system is composed of a hairbrush, an injection cavity and a micro-flow measuring pump, the straight line of the pointed end of the hairbrush is parallel to the central axis of the rotating spraying head, and the hairbrush is in contact with the rotating spraying head. The baffle is arranged on the U-type groove, and a cylindrical scraper on the baffle is a certain distance away from the rotating spraying head. The motor controls the rotating spraying head through belt transmission to rotate. The receiving plate is arranged at the upper end of the rotating spraying head. The high-voltage output end of the electrostatic generator is connected with the supporting bearings, and the grounded end of the electrostatic generator and the receiving plate are grounded at the same time. The receiving plate is made of electric conduction metal. The method includes the step that spinning solutions are evenly brushed to the rotating spraying head through the hairbrush to form solution film with the controllable thickness. The phenomenon that a spraying-head type electrostatic spinning device is prone to blocking is overcome by means of the hairbrush structure.

Description

technical field [0001] The invention relates to a brush-feeding type needle-free electrostatic spinning device and method, belonging to the field of electrostatic spinning. Background technique [0002] Nanofiber mat has small diameter, high porosity and large specific surface area, so it can be used in many fields such as air filtration, water treatment, lithium battery separator, etc. However, the traditional pinhole electrospinning device has two bottlenecks on the road to industrialization. One is that the pinholes are easily blocked during continuous spinning, which requires regular cleaning, which is time-consuming and labor-intensive. Second, the single-pinhole spinning efficiency is extremely low, only 100-1000mg / h. However, the flow channel design of the multi-pinhole spinning device is complicated, and the equipment cost is relatively high. Needle-free electrospinning devices have become a research hotspot in the field of electrospinning in recent years. Researc...

AI Technical Summary

Problems solved by technology

However, the traditional pinhole electrospinning device has two bottlenecks on the road to industrialization

One is that the pinholes are easy to block during continuous spinning, and need to be cleaned regularly, which is time-consuming and labor-intensive

Second, the single-pinhole spinning efficiency is extremely low, only 100-1000mg / h

However, this type of feeding method cannot accurately control the thickness and uniformity of the free surface film of the solution.

At the same time, the solution pool of this type of feeding method is generally open, and the solution in the pool volatilizes rapidly during spinning, which will affect the concentration of the spinning solution and the uniformity of the spinning fiber.

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