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Preparation method of aromatic polymer porous membrane

An aromatic polymer, porous membrane technology, applied in the field of membrane materials, can solve the problems of low decomposition temperature, difficult membrane production, and no patent literature reports on porous membrane materials, and achieves a short process, simple membrane production process, and high efficiency high effect

Active Publication Date: 2013-06-12
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Compared with PMIA, PPTA has more excellent physical-mechanical properties, but because the decomposition temperature of PPTA is low, and only concentrated sulfuric acid can dissolve it, it is difficult to make a film. So far, although there are patent literature reports about PPTA fiber , but there is no patent literature report on the aromatic polymer PPTA porous membrane material

Method used

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  • Preparation method of aromatic polymer porous membrane
  • Preparation method of aromatic polymer porous membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042]Dissolve the PPTA resin with a mass fraction (the same below) of 3.5wt% in 86.5wt% concentrated sulfuric acid with a concentration of 98wt%, then add porogen PEG6000, heat up to 80°C to completely dissolve, and defoam in a vacuum oven to obtain casting solution required. Scrape-coat the casting liquid at room temperature to form a flat film, and immediately immerse it in ultrafiltered water at 16°C, and solidify and form it for 24 hours. The obtained membranes were placed in ice water at 5°C, room temperature at 25°C and hot water at 50°C for 24 hours of extraction and washing. Then perform a performance test: wash the residual liquid on the membrane with deionized water, and then filter the pure water at 0.1Mpa to measure its water flux. The water flux of the obtained membrane was 132.70 (L / m 2 h), 149.28 (L / m 2 h) and 165.87 (L / m 2 h).

Embodiment 2

[0044] As described in Example 1, with other conditions unchanged, the porogen was changed to PEG with molecular weights of 2,000, 10,000, or 20,000, and placed in ice water at 5°C for extraction and washing for 24 hours. Then perform a performance test: wash the residual liquid on the membrane with deionized water, then filter pure water at 0.1Mpa, and measure its water flux; the water flux of the obtained membrane is 79.62 (L / m 2 h), 82.94 (L / m 2 h) and 99.52 (L / m 2 h).

Embodiment 3

[0046] Dissolve 2.0wt% PPTA resin in concentrated sulfuric acid with a mass fraction of 88wt% and a concentration of 98wt%, then add 10wt% of composite porogens such as PVP60000 and PEG2000, heat up to 80°C to completely dissolve, and defoam in a vacuum oven. That is, the required casting solution is obtained. Scrape-coat the casting solution at room temperature to form a flat film, and put the prepared film in room temperature of 25°C and hot water at 50°C for extraction and washing for 24 hours. Then perform a performance test: wash the residual liquid on the membrane with deionized water, and then filter the pure water at 0.1Mpa to measure its water flux. The water flux of the obtained membrane was 265.39 (L / m 2 h) and 281.98 (L / m 2 h).

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Abstract

The invention discloses a preparation method of an aromatic polymer porous membrane. The porous membrane comprises a flat membrane and a hollow fibrous membrane. The preparation method adopts the following porous membrane casting solution and solution-phase conversion membrane preparation technique. The membrane casting solution comprises the following components in percentage by mass: 1.5-15 wt% of PPTA (poly(p-phenylene terephthalamide)), 4.5-10 wt% of pore-forming agent and 86.5-94 wt% of solvent. The pore-forming agent is a soluble high polymer selected from at least one of PEGs (polyethylene glycols) with the average molecular weight of 600-20000 and PVPs (polyvinyl pyrrolidones) with the average molecular weight of 10000-100000; and the solvent is 98-100 wt% concentrated sulfuric acid. The porous membrane preparation technique comprises the following steps: 1) preparing the membrane casting solution; and 2) preparing the flat porous membrane by a wet process, or preparing the hollow fiber porous membrane by dry-wet spinning formation.

Description

technical field [0001] The invention relates to membrane material technology, in particular to a preparation method of an aromatic polymer porous membrane. The aromatic polymer refers to polyparaphenylene terephthalamide [Poly(para-Phenylene Terephthalamide), PPTA], and the porous membrane includes a flat membrane and a hollow fiber membrane. Background technique [0002] The meta-aromatic polyamide, polym-phenylene isophthalamide (PMIA), has strong flexibility and good physical-mechanical properties. It can be dissolved in some organic solvents to form an isotropic solution. Good processing performance, PMIA porous membrane material can be made by solution phase inversion method. At present, there have been relevant reports on PMIA membranes with porous structures at home and abroad. For example: Chinese patent CN1681875A [Sasaki Yi, etc., Teijin Co., Ltd.] has introduced a kind of manufacturing method that contains PMIA porous film, and it will contain the polymer soluti...

Claims

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Application Information

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IPC IPC(8): B01D71/58B01D69/08B01D69/06B01D67/00
Inventor 肖长发王纯黄庆林安树林
Owner TIANJIN POLYTECHNIC UNIV
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