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Electrostatic spinning method for melt

A melt electrospinning, electrospinning technology, applied in textile and papermaking, filament/thread forming, fiber processing and other directions, to achieve the effect of wide application, guaranteed processability and simple process flow

Pending Publication Date: 2019-06-14
CHINA ENFI ENGINEERING CORPORATION +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current melt electrospinning technology and equipment are immature, mainly based on self-design and construction. All spinning technologies are mostly aimed at polymer materials, and the working temperature is generally only 200-300°C, which cannot handle the melting point. For inorganic materials that can easily reach thousands of degrees Celsius, there are currently no equipment and related reports on electrospinning of ultra-high temperature inorganic melts. Therefore, for inorganic nanofibers, the existing spinning technology and equipment cannot achieve simple, efficient and low-cost preparation.

Method used

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  • Electrostatic spinning method for melt
  • Electrostatic spinning method for melt

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Close all valves of the device, turn on the vacuum pump, and evacuate the pressure in the cavity to below 4Pa; close the valve of the vacuum pump, open the nitrogen valve, and return the pressure in the cavity to normal pressure; repeat the vacuum pumping and nitrogen replacement twice. Maintain the nitrogen atmosphere and normal pressure in the cavity, add 10g of silicon powder into the crucible through the feeding system, heat it to about 1420°C to melt the silicon powder, adjust the pressure of the crucible so that the melt is extruded at a flow rate of 1 μL / min, and the spinneret The distance from the collector is 150mm, and the spinning is carried out at a voltage of 10kV. It is visible to the naked eye that the fibrous substance extends from the nozzle to the collector. After collecting for 1 hour, the samples were taken out and characterized by microscope, the results showed that the diameter of silicon nanofibers was 1000-1500nm.

Embodiment 2

[0048] Close all valves of the device, turn on the vacuum pump, and evacuate the pressure in the cavity to below 4Pa; close the valve of the vacuum pump, open the nitrogen valve, and return the pressure in the cavity to normal pressure; repeat the vacuum pumping and nitrogen replacement twice. Maintain the nitrogen atmosphere and normal pressure in the cavity, add 10g of silicon powder into the crucible through the feeding system, heat it to about 1420°C to melt the silicon powder, adjust the pressure of the crucible so that the melt is extruded at a flow rate of 2μL / min, and the spinneret The distance from the collector is 150mm, and the spinning is carried out at a voltage of 12kV. It is visible to the naked eye that the fibrous substance extends from the nozzle to the collector. After 1 hour of collection, the samples were taken out and characterized by microscopy, the results showed that the diameter of silicon nanofibers was 500-800nm.

Embodiment 3

[0050] Close all valves of the device, turn on the vacuum pump, and evacuate the pressure in the cavity to below 4Pa; close the valve of the vacuum pump, open the nitrogen valve, and return the pressure in the cavity to normal pressure; repeat the vacuum pumping and nitrogen replacement twice. Maintain the nitrogen atmosphere and normal pressure in the cavity, add 10g of silicon powder into the crucible through the feeding system, heat it to about 1420°C to melt the silicon powder, adjust the pressure of the crucible so that the melt is extruded at a flow rate of 5 μL / min, and the spinneret The distance from the collector is 150mm, and the spinning is carried out at a voltage of 20kV. It is visible to the naked eye that the fibrous substance extends from the nozzle to the collector. After 1 hour of collection, the samples were taken out and characterized by microscopy, the results showed that the diameter of silicon nanofibers was 200-400nm.

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Abstract

The invention provides an electrostatic spinning method for a melt. The method comprises the steps that S1, an inorganic material is heated to a molten state to form the melt; S2, the melt forms fibers through electrostatic spinning. The method is suitable for electrostatic spinning taking inorganic materials of high melting points as raw materials. The technology is simple in technical process, the orientation of the fiber product is high, and the preparation process is environmentally friendly.

Description

technical field [0001] The invention relates to the field of electrostatic spinning, in particular to a melt electrostatic spinning method. Background technique [0002] Electrospinning technology is mainly divided into solution electrospinning and melt electrospinning. In recent years, solution electrospinning has developed rapidly, and nanofibers can be prepared, but there are problems such as low production efficiency, solvent recovery or emission pollution. In contrast, melt electrospinning technology can make up for the deficiency of solution electrospinning to some extent, so melt electrospinning has also become a new hot spot. [0003] Melt electrospinning directly uses the melt of the target material as raw material without additional solvent, and the viscosity of the melt is higher than that of the solution, which can overcome the instability of the fiber in the electrostatic field and is expected to obtain fibers with better orientation Products, become a good ch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01D5/00
Inventor 杨涛严大洲刘诚司文学孙强万烨张升学
Owner CHINA ENFI ENGINEERING CORPORATION
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