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

Abstract

The invention discloses a large-scale magnetic spinning equipment and a method for preparing micro-nano fibers using the equipment. The equipment includes a support, a feeding device, a spinning injection device and a horizontally arranged drum-type collecting device. The drum-type collecting device The surface of the collection drum is fixed with a bar-shaped permanent magnet that provides a magnetic field. The spinning injection device is provided with a plurality of spinning nozzles, and the plurality of spinning nozzles are evenly arranged in a row. The strip-shaped permanent magnet on the surface of the collecting drum, and the spinning jet device also includes a nozzle driving mechanism that can drive the used spinning nozzle to reciprocate along the central axis of the collecting drum. This equipment replaces electric field force with magnetic field force, and stretches ferrofluid under the action of alternating magnetic field force to prepare magnetic micro-nano fibers. The whole process does not require high-voltage electricity, which effectively reduces production costs and safety hazards, and can continuously produce micro-nano fibers in batches. fibers, and the prepared fibers are arranged in an orderly manner, and the yield is high and suitable for large-scale production.

Description

technical field [0001] The invention relates to a preparation device for micro-nano fibers, in particular to a large-scale magnetic spinning device and a method for preparing micro-nano fibers with 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 nanofiber materials has also been further developed and researched. At present, the preparation methods of nanofibers mainly include stretching method, template method, phase separation method, self...

AI Technical Summary

Problems solved by technology

Among them, although the multi-needle electrospinning nanofiber preparation technology increases the number of jets to obtain a larger fiber yield, due to the high-voltage potential enrichment, when the voltage is higher than 30,000 volts, a "glow discharge" will be formed at the tip of the needle, which is harmful to spinning. The process causes mutual interference, and the prepared nanofiber film is uneven; the needle-free electrospinning technology is proposed under the idea of ​​increasing the liquid surface area and improving the fiber yield. International patent WO2005024101 reports a needle-free electrospinning equipment. The equipment soaks the drum-shaped electrode (fiber generator) in the polymer solution, and rotates the drum electrode so that the polymer solution is evenly loaded on the entire drum surface

Nanofibers can be obtained on the fiber collector when the loaded polymer solution is placed in the electric field formed by the drum electrodes and the fiber collector, and the electric field is strong enough to make the liquid on the drum surface form a Taylor cone, which completely eliminates the spinning process. The limitation of the silk nozzle greatly improves the production efficiency of electrospinning, but the disadvantage is that this method has strict requirements on the spinning liquid and requires a large electric field strength. The drum electrode is soaked in an open polymer solution tank, and the solvent pole Volatile, causing environmental pollution

The linear nozzle replaces the design of the traditional spinning nozzle, which avoids the occurrence of needle clogging. At the same time, the device has a simple structure and does not require additional atmosphere and auxiliary equipment. The production environment is friendly, but the controllability of the fiber diameter needs to be further improved.

However, these electrospinning devices have the following problems in popularization and application: (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 more than ten 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) Nanofibers prepared by electrospinning exist in the form of non-woven fabrics, and the fiber arrangement is very messy, which restricts the application of electrospinning technology in biomedicine and conductive materials. And the promotion and application of sensors and other fields

Images