PTFE/PI composite-nanometer-fiber porous membrane and preparing method thereof

A technology of composite nanofibers and composite fiber membranes, which is applied in fiber treatment, filament/thread forming, heating/cooling fabrics, etc., can solve the problems of poor hydrophobicity and alkali resistance, and poor processing performance of polyimide. Achieve the effect of uniform density, environmental protection and excellent thermal stability

Active Publication Date: 2016-09-28
JIANGXI ADVANCED NANOFIBER S&T CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, polyimide (PI) has poor processing performance, poor hydrophobicity and alkali resistance

Method used

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  • PTFE/PI composite-nanometer-fiber porous membrane and preparing method thereof
  • PTFE/PI composite-nanometer-fiber porous membrane and preparing method thereof
  • PTFE/PI composite-nanometer-fiber porous membrane and preparing method thereof

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preparation example Construction

[0037] In order to solve the above problems, the invention provides a preparation method of PTFE / PI composite nanofiber porous membrane, comprising the following steps:

[0038] 1) Prepare PEO solution: dissolve PEO in deionized water, stir, and prepare PEO solution;

[0039] 2) Prepare PEO / PTFE mixed solution: add PTFE emulsion to the PEO solution described in step 1), stir and prepare PEO / PTFE mixed solution;

[0040] 3) Prepare PEO / PTFE-PAAS mixture: add PAAS and deionized water to the PEO / PTFE mixture described in step 2), stir and prepare PEO / PTFE-PAAS mixture;

[0041] 4) Preparation of PTFE / PI composite nanofiber porous membrane: PEO / PTFE-PAAS composite fiber membrane was prepared by electrospinning the PEO / PTFE-PAAS mixture, and after heat treatment, the PTFE / PI composite nanofiber porous membrane was obtained.

[0042] PTFE emulsion:

[0043] The PTFE emulsion of the present invention is an aqueous dispersion obtained by emulsion polymerization of polytetrafluoroe...

Embodiment 1

[0063] The preparation method of PTFE / PI composite nanofiber porous membrane, wherein the solution in the PEO solution contains 4 wt% of PEO, the mass ratio of PEO and PTFE in the PEO / PTFE mixed solution is 3:100, and the PAAS in the PEO / PTFE-PAAS mixed solution The mass ratio to PTFE is 2:8, and the PEO / PTFE-PAAS mixture is 18wt% PEO / PTFE-PAAS mixture; the specific steps are as follows:

[0064] The PEO powder was dissolved in deionized water at 40 °C and mechanically stirred for 3 h to obtain a PEO solution with a mass fraction of 4 wt%. Cool to room temperature and the bubbles in the solution due to rapid stirring disappear. Add the PTFE emulsion into the PEO solution, stir and prepare the PEO / PTFE mixed solution; add PAAS and deionized water into the PEO / PTFE mixed solution, stir and prepare the PEO / PTFE-PAAS mixed solution ; When the PEO / PTFE-PAAS composite nanofiber membrane was prepared by electrospinning, the voltage, collection distance and flow rate were 13 kV, 20 c...

Embodiment 2

[0066] The preparation method of PTFE / PI composite nanofiber porous membrane, wherein the solution in the PEO solution contains 4 wt% of PEO, the mass ratio of PEO and PTFE in the PEO / PTFE mixed solution is 3:100, and the PAAS in the PEO / PTFE-PAAS mixed solution The mass ratio to PTFE is 1:4, and the PEO / PTFE-PAAS mixture is 18wt% PEO / PTFE-PAAS mixture; the specific steps are as follows:

[0067] The PEO powder was dissolved in deionized water at 40 °C and mechanically stirred for 3 h to obtain a PEO solution with a mass fraction of 4 wt%. Cool to room temperature and the bubbles generated by rapid stirring in the solution disappear. Add the PTFE emulsion into the PEO solution, stir and prepare the PEO / PTFE mixed solution; add PAAS and deionized water into the PEO / PTFE mixed solution, stir and prepare the PEO / PTFE-PAAS mixed solution ; When the PEO / PTFE-PAAS composite nanofiber membrane was prepared by electrospinning, the voltage, collection distance and flow rate were 13 kV...

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Abstract

The invention relates to the membrane preparing technology, in particular to a PTFE / PI composite-nanometer-fiber porous membrane and a preparing method thereof. The preparing method of the PTFE / PI composite-nanometer-fiber porous membrane includes the following steps of 1, preparing a PEO solution, wherein PEO is dissolved in deionized water, stirring is carried out, and the PEO solution is prepared; 2, preparing PEO / PTFE mixing liquid, wherein a PTFE emulsion is added into the PEO solution in the step 1, stirring is carried out, and the PEO / PTFE mixing liquid is prepared; 3, preparing PEO / PTFE-PAAS mixing liquid, wherein PAAS and deionized water are added into the PEO / PTFE mixing liquid in the step 2, stirring is carried out, and the PEO / PTFE-PAAS mixing liquid is prepared; 4, preparing PTFE / PI composite-nanometer-fiber porous membrane, wherein the PEO / PTFE-PAAS mixing liquid is subjected to electrostatic spinning to prepare a PEO / PTFE-PAAS composite-fiber membrane, heat treatment is carried out, and the PTFE / PI composite-nanometer-fiber porous membrane is obtained. The PTFE / PI composite-nanometer-fiber porous membrane has the advantages of being resistant to high temperature and acid-and-alkali corrosion and excellent in mechanical performance.

Description

technical field [0001] The invention relates to a membrane preparation technology, more specifically, the invention relates to a PTFE / PI composite nanofiber porous membrane and a preparation method thereof. Background technique [0002] With the rapid development of industry, economic development has been driven, but it has also brought some environmental problems to be solved. Such as the treatment of high-temperature waste gas and corrosive flue gas produced by thermal power generation, steel, cement and other industries, which brings excellent opportunities for the development of high-temperature filter materials. The core of high-temperature gas medium filtration and dust removal technology is high-temperature filter materials. Due to the characteristics of high working temperature and strong gas corrosion, filter materials need to maintain good performance under harsh conditions. [0003] Polytetrafluoroethylene (PTFE) is a non-polar linear crystalline polymer with m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D04H1/728D04H1/4291D04H1/4318D04H1/4342D01D5/00D06C7/00
CPCD01D5/003D01D5/0069D01D5/0076D01D5/0092D04H1/4291D04H1/4318D04H1/4342D04H1/728D06C7/00
Inventor 侯豪情冯艳周小平王琦吕晓义
Owner JIANGXI ADVANCED NANOFIBER S&T CO LTD
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