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Preparation method of polytetrafluoroethylene fiber with porous structure

A polytetrafluoroethylene, porous structure technology, applied in the direction of fiber chemical characteristics, final product manufacturing, sustainable manufacturing/processing, etc., can solve the problem of single fiber shape, chemical fiber materials that are difficult to meet human needs, and the performance of porous structures that cannot be formed etc. to achieve the effect of increasing the specific surface area and porosity

Pending Publication Date: 2021-01-01
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the process of preparing polytetrafluoroethylene fibers by the above method, the carrier is removed by high-temperature calcination, and the polytetrafluoroethylene is melted to form fibers, but the fibers prepared in this way have a single morphology and cannot develop special structures on their surfaces. It is even more impossible to form a porous structure to improve its performance, and its application has certain limitations.
[0004] In recent years, with the continuous development of science and technology and the improvement of people's living standards, traditional conventional chemical fiber materials have been difficult to meet the needs of human beings.

Method used

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  • Preparation method of polytetrafluoroethylene fiber with porous structure
  • Preparation method of polytetrafluoroethylene fiber with porous structure
  • Preparation method of polytetrafluoroethylene fiber with porous structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031](1) Weigh a certain amount of polyvinylpyrrolidone (PVP) and polytetrafluoroethylene (PTFE) emulsion in a mass ratio of 1:1, dissolve the two together in deionized water, and stir thoroughly for 2h at room temperature. Phase solution: After standing and defoaming, a solution with a solute concentration of 23 wt% is obtained, which is used as the spinning solution.

[0032](2) Add the spinning solution to the spinning device, and prepare micro-nano fibers through the electrostatic-centrifugal spinning process.

[0033]Electrostatic-centrifugal spinning parameters: Choose a dispensing needle with a diameter of 27G and a needle length of 12mm as the nozzle, and connect the nozzle to the spinneret through a matching connector. The collection method is conveyor belt collection, and the distance between the nozzle and the collector is set to 150mm. A syringe was used to inject 6 mL of spinning solution into the spinner to perform an electrostatic-centrifugal spinning test, where the rotat...

Embodiment 2

[0037](1) Weigh a certain amount of polyvinylpyrrolidone (PVP) and polytetrafluoroethylene (PTFE) emulsion in a mass ratio of 1:2, dissolve the two together in deionized water, and stir well at room temperature for 2h to become homogeneous Phase solution: After standing for defoaming, a solution with a solute concentration of 33 wt% is obtained, which is used as the spinning solution.

[0038](2) Add the spinning solution to the spinning device, and prepare micro-nano fibers through the electrostatic-centrifugal spinning process.

[0039]Electrostatic-centrifugal spinning parameters: Choose a dispensing needle with a diameter of 27G and a needle length of 12mm as the nozzle, choose an independently designed spinneret, and connect the nozzle to the spinneret through a matching connector. The collection method is conveyor belt collection, and the distance between the nozzle and the collector is set to 150mm. A syringe was used to inject 6 mL of spinning solution into the spinner to perform ...

Embodiment 3

[0043](1) Weigh a certain amount of polyvinylpyrrolidone (PVP) and polytetrafluoroethylene (PTFE) emulsion in a mass ratio of 1:3, dissolve the two together in deionized water, and stir thoroughly for 2h at room temperature to become homogeneous Phase solution: After standing for defoaming, a solution with a solute concentration of 40 wt% is obtained, which is used as the spinning solution.

[0044](2) Add the spinning solution to the spinning device, and prepare micro-nano fibers through the electrostatic-centrifugal spinning process.

[0045]Electrostatic-centrifugal spinning parameters: Choose a dispensing needle with a diameter of 27G and a needle length of 12mm as the nozzle, choose an independently designed spinneret, and connect the nozzle to the spinneret through a matching connector. The collection method is conveyor belt collection, and the distance between the nozzle and the collector is set to 150mm. Using a syringe, 6 mL of spinning solution was injected into the spinneret to...

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Abstract

The invention relates to the field of micro-nano fiber preparation, and aims to provide a preparation method of polytetrafluoroethylene fiber with a porous structure. The preparation method comprisesthe following steps of dissolving polyvinylpyrrolidone and polytetrafluoroethylene emulsion in deionized water, and stirring at room temperature to form a homogeneous solution; performing standing anddefoaming; adding the obtained spinning solution into a spinning device, and preparing micro-nano fiber through an electrostatic centrifugal spinning process; calcining the micro-nano fiber at the temperature of 360 DEG C in a nitrogen atmosphere; and carrying out dipping treatment in water, taking out the fiber, and drying the fiber to obtain the micro-nano fiber containing the microporous structure. According to the preparation method, the polytetrafluoroethylene fiber with the porous structure can be obtained by utilizing the high-temperature difficult-to-decompose property and the water-soluble property of the polyvinylpyrrolidone. The prepared product can improve the specific surface area and porosity of an original fiber material, can effectively improve the permeability, hydrophobicity and other properties of a fiber membrane, and has great application prospects in the fields of air filtration, oil-water separation, membrane distillation and the like.

Description

Technical field[0001]The invention relates to the field of preparation of micro-nano fibers, in particular to a preparation method of porous structure polytetrafluoroethylene fiber.Background technique[0002]Polytetrafluoroethylene (PTFE) has excellent thermal stability, chemical resistance, ultra-low surface energy and dielectric properties. It has important applications in the field of aerospace, medicine and life, and is used in sewage treatment and seawater desalination. It has great application value in industry.[0003]Polytetrafluoroethylene has high stability, and there is no suitable solvent to dissolve it so far. Therefore, solution spinning method cannot be used to prepare polytetrafluoroethylene fiber; polytetrafluoroethylene has a high viscosity above the melting point (327°C), does not flow, and forms condensation. Jelly, so it cannot be melt-spinned. Currently, there are usually three methods for processing PTFE fibers: emulsion spinning, paste extrusion and cutting. Emu...

Claims

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Application Information

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IPC IPC(8): D01F13/04D01F6/32
CPCD01F13/04D01F6/32Y02P70/62
Inventor 杨斌王安拓李祥龙侯腾
Owner ZHEJIANG SCI-TECH UNIV
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