Sawtooth type electrostatic spinning device capable of periodically changing electric field, and method thereof

Abstract

The invention discloses a sawtooth type electrostatic spinning device capable of periodically changing an electric field, and a method thereof. The device mainly comprises an extruder, an L-shaped spinning machine head, a transmission device, a spinning device, a collecting device, a power device and a liquid scraping device, wherein a power roller drives a sawtooth type steel belt to revolve; a guide roller guides the sawtooth type steel belt to revolve; and thus, the basic revolving action of spinning is completed. The L-shaped spinning machine head is adopted in the invention; the sawtoothtype steel belt passes through a mouth type slit; a non-woven collecting plate is arranged below; under driving rotation of a motor, because of revolving motion of the sawtooth type steel belt, the electric field at the tooth type bottom is periodically changed; therefore, the generation point of a Taylor cone is periodically changed along with periodic change of the strongest point of the field intensity; polymer jet can reach the non-woven collecting plate more uniformly along with the change period of the electric field, is solidified and deposited on the surface; in a condition that the collecting efficiency is not influenced, the fibre structure of collected nano-fibres is relatively uniform; and the material property is improved.

Description

technical field [0001] The patent of the invention relates to a zigzag electrospinning device and method that can periodically change the electric field, and belongs to the field of electrospinning. Background technique [0002] Electrospinning, due to its wide applicability of raw materials, low cost, and simple equipment, is widely regarded by academia and industry as a simple and efficient method for industrially preparing micro-nano fibers, and it is also the most promising process method. . The basic principle is that the polymer solution or melt forms a Taylor cone at the end of the capillary under the action of a high-voltage electrostatic field force, and then flies to the receiving device, the solvent in the solution evaporates or the melt solidifies, and finally forms a supercapillary cone on the receiving device. fine fibers. Among them, the solution electrospinning method will bring environmental pollution and other problems due to the use of organic solvents. ...

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Problems solved by technology

Chinese patent 201510278266.7 discloses an air-jet assisted multi-needle electrospinning device, which can improve the uniformity of spinning webs to a certain extent through the assistance of airflow, but there are problems such as easy blockage of needles and easy mutual influence of high-voltage electric fields; Chinese patent 201820926935.6 discloses a uniform linear melt electrospinning device, which creatively uses high-temperature metal wires in close contact with reciprocating solid polymers to melt the polymers and adhere to the surface of the metal wires, ensuring the electric field Evenly distributed, to achieve uniform netting, but the mechanism is complex and prone to failure, and the efficiency of reciprocating motion is relatively low

The method of improving the uniformity of fiber web formation adopted by the existing patents usually includes a certain amount of idle travel, which can easily affect the spinning efficiency

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