A magnetic spinning device and a method for preparing micro-nano fibers using the device

Abstract

The invention discloses a magnetic spinning device and a method for preparing micro-nano fibers using the device. The device includes a feeding device capable of controlling the feeding rate, a spinning nozzle, a nozzle driving mechanism and a spinning receiving device, and the spinning receiving device Including the collection disc, the center of the bottom of the collection disc is connected with the output shaft of the brushless DC motor, and the upper surface of the collection disc is symmetrically arranged with the central axis of the disc as a symmetrical axis. It is a permanent magnet, and the rest are metal fine needles. The injection port of the spinning nozzle points to the permanent magnet of the spinning receiving device. The driving mechanism of the nozzle can drive the spinning nozzle to do vertical reciprocating motion. The device adopts the action of a rotating magnetic field to stretch the magnetic fluid jet for spinning. The whole process does not require high-voltage action, orderly reduces production costs and safety hazards, and the prepared fibers are arranged in an orderly manner, and the output is high and suitable for large-scale production.

Description

technical field [0001] The invention relates to a micro-nano fiber preparation device, in particular to a magnetic spinning device and a method for preparing micro-nano fibers using the device. Background technique [0002] One-dimensional nanofibers refer to two-dimensional nanoscale linear materials on the three-dimensional spatial scale, which have high porosity, large specific surface area, large length / diameter ratio, and different electrical, magnetic, Physical and chemical properties such as force, heat, and light have broad applications in many fields such as nanoelectronic devices, air filtration, sensors, and biomedicine. With the continuous development of the application technology of nanofiber materials in various fields, the preparation technology of nanofibers has also been further developed and innovated. The current preparation methods of nanofibers mainly include stretching method, template method, phase separation method, self-assembly method and spinning ...

AI Technical Summary

Problems solved by technology

However, there are the following problems in the popularization and application of electrospinning technology at present: (1) Traditional electrospinning devices usually use DC high-voltage power supply to provide the high-voltage electrostatic field required for spinning, and the working voltage of spinning is as high as tens of thousands of volts or even tens of 10,000 volts, not only causes certain hidden dangers to operators, but also increases the cost of large-scale industrial production; (2) The electrospinning method has high requirements on the conductivity of the spinning solution, and it needs to add additional high-conductivity materials for blending and spinning, and Post-processing is required to obtain high-purity nanofibers, which is costly and time-consuming; (3) The yield of nanofibers prepared by the current electrospinning method is low, and it is difficult to prepare large-scale production, and there is still a big gap from practical application; (4 ) The nanofibers prepared by electrospinning exist in the form of non-woven fabrics, and the fiber arrangement is very messy, which restricts the popularization and application of electrospinning technology in the fields of biomedicine, conductive materials and sensors.

Yang Dayong et al. (Advanced Materials, 2007, 19, 3702-3706) reported a magnetic field electrospinning technology to prepare ordered nanofibers. This method cleverly introduces magnetic field-assisted spinning to obtain ordered magnetic nanofibers. However, The magnetic field applied by this method only makes the fibers arranged in an orderly manner, and fails to give full play to the advantages of the magnetic field. It still relies purely on high-voltage electrostatic spinning, and the working voltage is relatively high; Chinese patent "A preparation method for polymer micro-nano composite fibers" (ZL201310031876.8) introduced that on the basis of the low-voltage near-field electrospinning method, the magnetic field force is used to partially replace the electric field force to stretch and spin the fiber to prepare nanofibers, which reduces the spinning voltage, but this method still requires a higher voltage action, and the spinning output is low, which cannot be applied to large-scale industrial production

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