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Aramid fiber III/polyvinyl alcohol blended gas separation film and preparation method thereof

A technology of gas separation membrane and polyvinyl alcohol, applied in separation methods, semi-permeable membrane separation, dispersed particle separation, etc., can solve the problems of membrane damage, poor pressure resistance, etc., and achieve easy control, improved flexibility, and low cost Effect

Active Publication Date: 2014-01-29
中科检测技术服务(广州)股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when aramid fiber III is used as a membrane material, it has poor pressure resistance, and when it is used as a gas separation membrane, it is easy to cause membrane damage due to the high-pressure operation of the membrane module.

Method used

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  • Aramid fiber III/polyvinyl alcohol blended gas separation film and preparation method thereof
  • Aramid fiber III/polyvinyl alcohol blended gas separation film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Example 1: Preparation of ultra-thin, high-strength aramid fiber III / polyvinyl alcohol blend gas separation membrane

[0038] (1) Dissolve 5 parts by weight of aramid fiber III (provided by Guangdong Caiyan Co., Ltd.) in 140 parts by weight of dimethyl sulfoxide (DMSO), add 7 parts of potassium hydroxide, and stir for 10 days at a temperature of 20°C to form homogeneous solution. Add 5 parts by weight of PVA-2499 into the above solution, stir evenly to form a casting solution for later use

[0039] (2) Use a scraper to scrape out a film with a thickness of 400um on smooth glass from the casting solution obtained in (1).

[0040] (3) Evaporate the solvent from the film scraped in (2) at 50°C for 10 minutes, and then pour it into distilled water to obtain a gel film.

[0041] (4) Dry the gel membrane obtained in (3) at 120°C to obtain an aramid III / polyvinyl alcohol blended gas separation membrane.

Embodiment 2

[0042] Example 2: Preparation of ultra-thin, high-strength aramid fiber III / polyvinyl alcohol blended gas separation membrane

[0043] (1) Dissolve 10 parts by weight of aramid fiber III in 150 parts by weight of N,N-dimethylformamide (DMAC), add 15 parts by weight of potassium tert-butoxide, and 7 parts by weight of lithium chloride. Stir for 2 days to form a homogeneous solution. Add 2 parts by weight of PVA-1799 into the above solution, stir evenly to form a casting solution for use.

[0044] (2) Use a scraper to scrape out a film with a thickness of 300um on a smooth glass from the casting solution obtained in (1).

[0045] (3) Evaporate the solvent from the film scraped in (2) at 100°C for 5 minutes, and then pour it into distilled water to obtain a gel film.

[0046] (4) Dry the gel membrane obtained in (3) at 100°C to obtain an aramid III / polyvinyl alcohol blended gas separation membrane.

Embodiment 3

[0047] Example 3: Preparation of ultra-thin, high-strength aramid fiber III / polyvinyl alcohol blended gas separation membrane

[0048](1) Dissolve 8 parts by weight of aramid fiber III in 100 parts by weight of N,N-dimethylacetamide (DMAC), add 5 parts by weight of sodium hydride (NaH), 10 parts by weight of calcium chloride, and heat at 30°C A homogeneous solution was formed under stirring for 7 days. Add 0.4 parts by weight of PVA-1788 into the above solution, stir evenly to form a casting solution for use.

[0049] (2) Use a scraper to scrape out a film with a thickness of 100um on a smooth glass from the casting solution obtained in (1).

[0050] (3) Evaporate the solvent from the film scraped in (2) at 120°C for 5 minutes, and then pour it into distilled water to obtain a gel film.

[0051] (4) Dry the gel membrane obtained in (3) at 180°C to obtain an aramid III / polyvinyl alcohol blended gas separation membrane.

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Abstract

The invention belongs to the technical field of aramid fiber III blended materials, and discloses an ultrathin high-strength aramid fiber III / polyvinyl alcohol blended gas separation film, and a preparation method and application thereof. The preparation method comprises the following steps: dissolving aramid fiber III in an organic solvent, adding assistant and strong alkali, stirring uniformly while heating, adding polyvinyl alcohol, and stirring to form a film casting solution; and scratching the film casting solution to form a film, evaporating out the solvent, putting in a gel bath to obtain a gel film, and carrying out heat treatment to obtain the ultrathin high-strength aramid fiber III / polyvinyl alcohol blended gas separation film. The polyvinyl alcohol with favorable toughness is introduced into the rigid heterocyclic ring aramid fiber, thereby keeping the favorable properties of the aramid fiber III and enhancing the flexibility; and the impact strength of the obtained aramid fiber III / polyvinyl alcohol blended gas separation film is 23-44 kJ / m<2>, the elongation at break is 5-9%, the film thickness is 8-12 um, and the CO2 / CH4 separation coefficient is 32-45.

Description

technical field [0001] The invention belongs to the technical field of aramid fiber III blend materials, in particular to an ultra-thin, high-strength aramid fiber III / polyvinyl alcohol blended gas separation membrane and its preparation method and application. Background technique [0002] As the most important component of new materials, new chemical materials play an important role in the national economy, especially in high-tech and cutting-edge technologies. As a new chemical material, aramid occupies an extremely important position in the field of high-performance fibers and polymer-based composite materials. It is also the most widely used of the world's three high-performance fibers (carbon fiber, aramid, and ultra-high molecular weight polyethylene fiber). It represents the technical development level of a country's high-performance fibers. Aramid fiber, also known as aromatic polyamide, is a new high-tech synthetic fiber with high strength, high modulus, high temp...

Claims

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Application Information

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IPC IPC(8): B01D71/56B01D67/00B01D53/22
CPCY02C10/10Y02C20/40
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 中科检测技术服务(广州)股份有限公司
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