Preparation method of chlorine-resistant pollution-resistant polyamide reverse osmosis membrane

A reverse osmosis membrane and pollution-resistant technology, applied in the field of preparation of polyamide reverse osmosis membrane, can solve the problems of poor chlorine resistance and pollution resistance of polyamide reverse osmosis membrane, no cycle reversibility, etc. The effect of improving water flux and pollution resistance, excellent chlorine resistance

Inactive Publication Date: 2018-12-07
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The invention aims to solve the problem that the existing modified polyamide reverse osmosis membrane has poor chlorine resistance and pollution resis...

Method used

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  • Preparation method of chlorine-resistant pollution-resistant polyamide reverse osmosis membrane
  • Preparation method of chlorine-resistant pollution-resistant polyamide reverse osmosis membrane
  • Preparation method of chlorine-resistant pollution-resistant polyamide reverse osmosis membrane

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specific Embodiment approach 1

[0027] Specific embodiment one: the preparation method of a kind of anti-chlorine anti-pollution polyamide reverse osmosis membrane of this embodiment is to carry out according to the following steps:

[0028] 1. Preparation of organic nanofiber dispersion:

[0029] Grind the high-performance organic fibers containing amino groups to grow into 1 μm ~ 20 μm with a fiber grinder to obtain the ground organic fibers, put the ground organic fibers in the reaction kettle, and add dimethyl sulfoxide to the reaction kettle , and heat up to 100°C to 200°C, adjust the speed to 200r / min to 1000r / min, stir and reflux for 2h to 5h to obtain a mixed solution, pass the mixed solution through a 10,000-mesh filter to remove undispersed organic fibers to obtain a dispersion , centrifuging the dispersion for 3 minutes to 15 minutes at a rotational speed of 3000r / min to 10000r / min, and then dispersing the precipitate into deionized water to obtain an organic nanofiber dispersion;

[0030] The ma...

specific Embodiment approach 2

[0047] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that the high-performance organic fiber containing amine-based structure described in step 1 is poly 2,5-dihydroxy-1,4-phenylene pyridimidazole fiber, polyparaphenylenebenzimidazole fiber or aramid fiber. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0048] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that in Step 1, the high-performance organic fiber containing amine structure is ground with a fiber grinder to grow to 1 μm to 5 μm, and the ground organic fiber is obtained. Fiber, put the ground organic fiber in the reaction kettle, add dimethyl sulfoxide into the reaction kettle, and raise the temperature to 100°C~155°C, adjust the speed to 300r / min~1000r / min, stir and reflux for 3h~5h , to obtain a mixed solution, pass the mixed solution through a 10000-mesh filter to remove undispersed organic fibers to obtain a dispersion, centrifuge the dispersion for 3min to 10min at a speed of 3000r / min to 8000r / min, and then remove the precipitate The mixture was dispersed in deionized water to obtain a dispersion of organic nanofibers. Others are the same as in the first or second embodiment.

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Abstract

The invention discloses a preparation method of a chlorine-resistant pollution-resistant polyamide reverse osmosis membrane and relates to a preparation method of the polyamide reverse osmosis membrane. The invention aims at solving the problems of poor chlorine resistance, poor pollution resistance and no cyclic reversibility of the existing modified polyamide reverse osmosis membrane. The preparation method comprises the following steps of: (1) preparation of organic nanofiber dispersing liquid; (2) preparation of MOFs water dispersing liquid; (3) preparation of the chlorine-resistant pollution-resistant modified polyamide reverse osmosis membrane. The preparation method disclosed by the invention is used for preparing the chlorine-resistant pollution-resistant polyamide reverse osmosismembrane.

Description

technical field [0001] The invention relates to a preparation method of a polyamide reverse osmosis membrane. Background technique [0002] Polyamide reverse osmosis composite membrane has been widely used in seawater desalination, brackish water desalination, pharmaceuticals, biology and other fields due to its advantages of high water production efficiency and high ion rejection rate. In actual operation, the production of microorganisms is inhibited by adding active chlorine oxidizing agents. However, the residual active chlorine can significantly damage the polyamide membrane material, resulting in a significant decline in membrane separation performance. Therefore, the problem of chlorine resistance and pollution resistance of the membrane has become an important problem to be overcome in the industrial production of reverse osmosis membranes. The existing methods to improve the chlorine resistance and pollution resistance of polyamide reverse osmosis membrane mainly ...

Claims

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Application Information

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IPC IPC(8): B01D69/02B01D71/56B01D67/00B01D61/02
CPCB01D61/025B01D67/0093B01D69/02B01D71/56B01D2325/30B01D2325/36
Inventor 胡桢刘莹莹杨蕾卢飞黎俊黄玉东
Owner HARBIN INST OF TECH
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