Continuous mass production method and continuous mass production equipment for electrospun nanofiber membranes

Abstract

The invention relates to a continuous mass production method and continuous mass production equipment for electrospun nanofiber membranes. The method comprises the following steps: (1), electrified electrodes are kept in a vibrating state to drive polymer liquor to a plurality of protrusions on the upper surfaces of the electrified electrodes, so as to form a Taylor cone, and ensure that the whole upper surfaces become spinning surfaces, which obtains high spinning production capacity; (2), air in the space between two electrodes is sucked to the back side of a counter electrode to generate an air flow, so that stressed drift of nanofiber is accelerated, and the nanofiber is sucked to be laid on a continuous receiving screen to form a membrane; and (3) the air flow is heated dry hot air. The equipment comprises a polymer container, the vibrating electrified electrodes, the continuous receiving screen, the counter electrode and a negative pressure chamber, wherein the upper surfaces of the vibrating electrified electrodes are approximately in accordance with the liquid level; the counter electrode is made of a metal mesh or a porous metal plate; the negative pressure chamber comprises a hood, a rear air chamber, a balancing plate and an air suction pump; each vibrating electrified electrode is a metal mesh-shaped plane or a porous metal flat plate; innumerous holes and innumerous small protrusions are formed on the plane; and the small protrusions are regularly arranged and higher than the plane. The invention facilitates mass production of the electrospun nanofiber membranes.

Description

technical field [0001] The present invention relates to a method and apparatus for the continuous mass production of nanofibrous membranes from polymer solutions in an electric field. Background technique [0002] The use of electrospinning to manufacture nanometer-sized fibers is not the latest technology. Formhals proposed related patents as early as 1934. However, due to the lack of equipment-related conditions at that time, it has not been taken seriously until the global nano-boom in recent years. It has been extensively discussed and researched and developed by the academic circles. [0003] Electrospinning equipment is not complicated, mainly including injection motor, solution conduit, spinneret, voltage supply and a fiber collection carrier. The technical feature is to control the transmission speed of the polymer solution or melt with a motor, and push the polymer solution to the end of the capillary. Since a high-voltage electrostatic field (10000-50000 volts) is...

AI Technical Summary

Problems solved by technology

[0006] The disadvantage of all the above-mentioned methods and devices for producing nanofibers is that only a very small amount of polymer material can be produced in a certain time interval. About one spinneret can only process about 0.5 grams of polymer in one hour, which cannot be achieved. Industrial production of nanofibers

[0007] In addition, although Chinese patents 200810032247, 200810039299, and 200710036447 have improved spinning production capacity, there are the following problems: or the droplets will directly splash on the fiber receiving net, affecting the quality of fiber nonwovens

Or the structure is complicated, and the capillary pores in the cylindrical electrode are easily blocked, and the efficiency is not high

Or the fluctuation of the liquid level is not easy to control and stabilize, resulting in a decline in the quality of the fiber nonwovens

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