Core-sheath nano-fiber three-stage coaxial electrospinning preparation method and device

Abstract

The invention provides a core-sheath nano-fiber three-stage coaxial electrospinning preparation method. The core-sheath nano-fiber three-stage coaxial electrospinning preparation method comprises the following steps: step one, respectively filling an inner layer fluid injector, a middle layer fluid injector and an outer layer fluid injector with inner layer fluid, middle layer fluid and outer layer fluid which are dispensed; step two, connecting a three-stage coaxial electrospinning head to a high voltage electrostatic generator, so that the three-stage coaxial electrospinning head is electrified, the inner layer fluid, the middle layer fluid and the outer layer fluid form a Taylor cone at the three-stage coaxial electrospinning head, and jet flow is sent out; and step three, volatilizing the outer layer fluid in the fast stretching process after the jet flow is sent out, finally forming core-sheath nano-fibers and receiving the core-sheath nano-fibers by using a fiber receiving plate. The invention also provides a core-sheath nano-fiber three-stage coaxial electrospinning preparation device which comprises the high voltage generator, the three-stage coaxial electrospinning head, the fiber receiving plate and fluid injection pumps.

Description

technical field [0001] The invention belongs to the field of micro-nano material processing, and in particular relates to a three-stage coaxial electrospinning preparation method and device for core-sheath nanofibers. Background technique [0002] High-voltage electrospinning technology is a top-down nano-manufacturing technology. The jet is formed by overcoming the liquid surface tension and viscoelastic force of the droplets at the tip of the nozzle by an external electric field force. Under the joint action of electrostatic repulsion, Coulomb force and surface tension, The atomized liquid jet is bent, stretched, and split by high frequency, and is stretched tens of millions of times within tens of milliseconds. After solvent volatilization or melt cooling, nano-scale fibers are obtained at the receiving end. This technology has simple process, convenient operation, wide selection of materials, strong controllability, and can prepare nanofibers with microstructure characte...

AI Technical Summary

Problems solved by technology

In the process of preparing core-sheath nanofibers by common coaxial high-voltage electrospinning process, there is a common problem about the concentration of the sheath liquid. If the polymer concentration in the sheath liquid is too high, it will easily block the spinning head. If the sheath liquid If the polymer concentration is too low, it is easy to cause the core fluid to rush out. In addition, the sheath fluid is often easily injected independently to form fiber splitting.

These circumstances make it difficult to control the process of directly preparing core-sheath nanofibers by ordinary coaxial electrospinning process, and the quality of the fibers is not high.

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