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Kevlar nano fiber porous membrane, and preparation method and application thereof

A nanofiber and porous membrane technology, applied in the field of fiber membranes, can solve the problems of reducing the strength of para-aramid fibers, and achieve the effects of high strength, good high temperature resistance and short process.

Active Publication Date: 2014-01-29
GUANGZHOU CHEM CO LTD CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The addition of a large amount of hydrophilic monomers in the synthesis of modified para-aramid fibers in this method will reduce the strength of para-aramid fibers

Method used

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  • Kevlar nano fiber porous membrane, and preparation method and application thereof
  • Kevlar nano fiber porous membrane, and preparation method and application thereof
  • Kevlar nano fiber porous membrane, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Embodiment 1: Preparation of high-strength, high-temperature-resistant, solvent-resistant Kevlar nanofiber porous membrane

[0046](1) Add 16 parts by weight of Kevlar fibers (provided by Dupont), 16 parts by weight of potassium hydroxide, and 200 parts by weight of dimethyl sulfoxide into a round bottom flask, and stir at 25°C for 10 days to form uniform, transparent black-red Kevlar nanofibers. Methyl sulfoxide solution.

[0047] (2) Put 1 weight part of PEG-200 into the Kevlar solution prepared in (1), and stir for 2-10 hours to form a uniform casting solution. The casting solution was vacuum degassed for 2 hours before use.

[0048] (3) Scrape the film-casting solution on a clean glass plate with a scraper to form a 100um thick film, evaporate the solvent at 50°C for 5 minutes, sink into distilled water to form a gel film. The gel film was soaked in distilled water for 8-24 hours until the solvent was completely removed, and then placed in a vacuum oven for 2 hour...

Embodiment 2

[0051] Embodiment 2: Preparation of high-strength, high-temperature-resistant, solvent-resistant Kevlar nanofiber porous membrane

[0052] (1) Add 15 parts by weight of Kevlar, 15 parts by weight of potassium hydride, and 200 parts by weight of N,N-dimethylformamide (DMAC) into a round bottom flask, and stir at 50°C for 2 days to form a uniform, transparent black-red Kevlar nanofiber DMAC solution.

[0053] (2) Put 5 parts by weight of PVP-15 into the Kevlar solution prepared in (1), and stir for 2-12 hours to form a uniform casting solution. The casting solution is vacuum degassed for 2 to 4 hours before use.

[0054] (3) Scrape the film-casting solution on a clean glass plate with a scraper to form a 120um thick film, evaporate the solvent at 70°C for 4 minutes, sink into distilled water to form a gel film. The gel film was soaked in distilled water for 8-24 hours until the solvent was completely removed, and then placed in a vacuum oven for 2 hours at 60°C and 2 hours at ...

Embodiment 3

[0057] Embodiment 3: Preparation of high-strength, high-temperature-resistant, solvent-resistant Kevlar nanofiber porous membrane

[0058] (1) Add 16 parts by weight of Kevlar, 8 parts by weight of sodium hydride, and 200 parts by weight of N,N-dimethylacetamide (DMF) into a round bottom flask, and stir at 40°C for 4 days to form a uniform, transparent black-red Kevlar nanofiber DMF solution.

[0059] (2) Put 7 parts by weight of PEG-2000 into the Kevlar solution prepared in (1), and stir for 2-10 hours to form a uniform casting solution. The casting solution is vacuum degassed for 2 to 4 hours before use.

[0060] (3) Use a spatula to scrape the film casting solution on a clean glass plate to form a 100um thick film, evaporate the solvent at 80°C for 3 minutes, and sink into a solution with a volume ratio of distilled water / ethanol of 50 / 50 to form a gel film. The gel film was soaked in distilled water for 8-24 hours until the solvent was completely removed, then placed in ...

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Abstract

The invention belongs to the technical field of fiber membranes, and discloses a Kevlar nano fiber porous membrane which has high strength, high temperature resistance and solvent resistance, and a preparation method and application thereof. The preparation method comprises the following specific steps: dissolving Kevlar fibers in organic solvent, adding assistants and strong alkali, heating, and stirring to disperse, thus obtaining a Kevlar nano fiber dispersion; adding a pore forming agent into the dispersion, uniformly stirring to from a membrane casting solution, and performing vacuum degassing for later use; forming the membrane casting solution into a membrane on a glass plate through blade coating, evaporating the solvent, putting into a gel bath to obtain a gel membrane, and soaking in water; and performing heat treatment on the soaked gel membrane to obtain the Kevlar nano fiber porous membrane having high strength, high temperature resistance and solvent resistance. According to the invention, the Kevlar fibers are dispersed into nano fibers and then formed into the membrane through a mild method, so that the excellent properties of high strength, high modulus and solvent resistance are reserved; and a three-dimensional porous structure is endued. Thus, the Kevlar nano fiber porous membrane is applicable to water treatment in a harsh environment.

Description

technical field [0001] The invention belongs to the technical field of fiber membranes, and in particular relates to a high-strength, high-temperature-resistant, and solvent-resistant Kevlar nanofiber porous membrane and a preparation method and application thereof. Background technique [0002] Kevlar fiber is a high-performance para-aramid fiber developed by DuPont in the United States in the 1960s and industrialized in the 1970s. The chemical name of Kevlar fiber is poly-p-phenylene terephthalate (PPTA), which is called aramid-1414 in China. PPTA fiber is a crystalline structure polymer that is cross-linked in a network by PPTA molecules that are similar to rigid extended chains. Kevlar fiber is a high-performance linking benzamide. The amide bond forms a conjugated structure with the benzene ring group. The internal rotation potential energy is quite high. The macromolecular configuration is a rigid chain structure extending along the axial direction. The molecular arra...

Claims

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Application Information

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IPC IPC(8): B01D71/06B01D67/00C02F1/44
Inventor 胡继文吴艳胡盛逾涂园园刘峰刘国军林树东杨洋苗磊
Owner GUANGZHOU CHEM CO LTD CHINESE ACADEMY OF SCI
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