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Method for preparing polytetrafluoroethylene (PTFE) nanofiber porous membrane by virtue of PEO template scarification method

A polytetrafluoroethylene and nanofiber technology, used in separation methods, chemical instruments and methods, filtration and separation, etc., can solve the problems of unfavorable product performance, defects, high viscosity, and achieve excellent thermal stability, excellent chemical resistance, The effect of uniform density

Active Publication Date: 2016-08-17
JIANGXI XIAN CAI NANOFIBERS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no suitable solvent that can dissolve PTFE, and because of its high viscosity, it will not flow when it reaches the melting point, which makes the processing of PTFE more difficult.
The traditional methods for preparing PTFE fibers mainly include film split spinning, paste extrusion, melt spinning, and emulsion spinning. The fiber diameter obtained by these methods is difficult to control, and the surfactant added Many, not conducive to the performance of the product
[0004] In the prior art, a mixture of polyvinyl alcohol and polytetrafluoroethylene emulsion was used to successfully prepare polytetrafluoroethylene nanofiber membranes by electrospinning technology, but due to the addition of too much polyvinyl alcohol (30%), during the heat treatment process It cannot be completely removed, which will cause defects in the fiber and affect the mechanical properties of the PTFE fiber membrane. influences

Method used

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  • Method for preparing polytetrafluoroethylene (PTFE) nanofiber porous membrane by virtue of PEO template scarification method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] A PTFE nanofiber porous membrane prepared by the PEO template sacrifice method, wherein the mass ratio of PEO to PTFE in the spinning mixture is 3:100, prepared by the following steps:

[0070] (1) Dissolve PEO powder B-1 in water at 40 °C, stir and mix for 3 hours to prepare a PEO aqueous solution with a mass fraction of 4 wt%, cool to room temperature and there are no bubbles in the solution, then add PTFE emulsion A-1, and stir Mix for 1 hour to obtain spinning mixture;

[0071] (2) Spin the spinning mixture obtained in step (1) using electrospinning technology, the voltage during the electrospinning is 20kV, the distance from the spinning nozzle to the opposite electrode collecting substrate is 20cm, and the spinning The flow rate is 0.002mm / s;

[0072] (3) Collect the PEO / PTFE nascent composite nanofiber membrane obtained after electrospinning in step (2), then place it in an oven and dry it at 70°C for 1 hour;

[0073] (4) Heat the dried composite nanofiber memb...

Embodiment 2

[0076] A PTFE nanofiber porous membrane, which is prepared by using the PEO template sacrifice method, wherein the mass ratio of PEO to PTFE in the spinning mixture is 3:100, and the preparation method is the same as that of Example 1, except that step (4): The composite nanofiber membrane dried in step (3) was heated at 380 °C for 10 min to decompose and remove PEO, and at the same time, PTFE nanoparticles were melt-bonded, and finally a continuous PTFE nanofiber porous membrane was obtained.

[0077] Performance characterization: the tensile strength of the PTFE nanofiber porous membrane is 14.52MPa, the elastic modulus is 65.89MPa, and the elongation at break is 658.40%; the PTFE nanofiber porous membrane is placed at 7.14 mol / L -1 h 2 SO 4 After being treated at 100 °C for 12 h, the tensile strength was 14.46 MPa, the elastic modulus was 66.78 MPa, and the elongation at break was 642.12 %; the PTFE nanofiber porous membrane was placed in a 6 mol / L -1 After being treated...

Embodiment 3

[0080] A PTFE nanofiber porous membrane, which is prepared by using the PEO template sacrifice method, wherein the mass ratio of PEO to PTFE in the spinning mixture is 3:100, and the preparation method is the same as that of Example 1, except that step (4): The composite nanofiber membrane dried in step (3) was heated at 400 °C for 10 min to decompose and remove PEO, and at the same time, PTFE nanoparticles were melt-bonded, and finally a continuous PTFE nanofiber porous membrane was obtained.

[0081] Performance characterization: the tensile strength of the PTFE nanofiber porous membrane is 11.21 MPa, the elastic modulus is 66.13MPa, and the elongation at break is 545.31%; the PTFE nanofiber porous membrane is placed at 7.14 mol / L -1 h 2 SO 4 After being treated at 100 °C for 12 h, the tensile strength was 10.97 MPa, the elastic modulus was 67.26 MPa, and the elongation at break was 529.33%; the PTFE nanofiber porous membrane was placed in a 6 mol / L -1 After being treated...

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Abstract

The invention provides a method for preparing a polytetrafluoroethylene (PTFE) nanofiber porous membrane by virtue of a PEO template scarification method. The method is characterized by comprising the following steps: mixing a PTFE emulsion with a PEO aqueous solution, so as to obtain a spinning mixed solution, performing electrostatic spinning on the spinning mixed solution so as to form a PEO / PTFE primary composite nanofiber membrane; performing thermal treatment on the PEO / PTFE primary composite nanofiber membrane so as to obtain a PTFE nanofiber porous membrane. The prepared PTFE nanofiber porous membrane is less in defect, continuous and uniform in density, and has excellent thermal stability, chemical resistance and mechanical property.

Description

technical field [0001] The invention relates to a method for preparing a nanofiber porous membrane, in particular to a method for preparing a polytetrafluoroethylene nanofiber porous membrane. Background technique [0002] Electrospinning polymer solutions, melts, and emulsions to prepare fibrous porous membranes is a rapidly developing technology. Invented by John Francis Cooley in 1900, this technique became popular in the early 1990s. In the past 15 years, the technology has developed very rapidly and has been favored by many scientists. In 2013, 3578 papers were published on electrospinning. Through the simple and convenient electrospinning technology, the prepared fibers have the characteristics of controllable diameter, high porosity of fiber membrane and large specific surface area, and are widely used in the fields of composite materials, filtration, sensors and tissue engineering. [0003] Polytetrafluoroethylene (PTFE), known as the "King of Plastics", is a no...

Claims

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Application Information

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IPC IPC(8): D04H3/007D04H3/009D04H3/03D04H3/147B01D39/08
CPCB01D39/083D04H3/007D04H3/009D04H3/03D04H3/147D10B2321/042D10B2331/30
Inventor 侯豪情冯艳周小平王琦吕晓义
Owner JIANGXI XIAN CAI NANOFIBERS TECH
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