A zwitterionized high-strength pollution-resistant forward osmosis membrane and preparation method thereof

A zwitterionic and forward osmosis membrane technology, applied in the field of membrane separation, can solve the problems of low efficiency and poor controllability, and achieve the effects of enhanced mechanical strength, excellent forward osmosis flux, and large-scale development and production

Active Publication Date: 2021-06-22
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the modification of the membrane surface by zwitterions through surface grafting, bulk blending, etc. often involves multi-step reactions, with low efficiency and poor controllability.

Method used

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Examples

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Effect test

preparation example Construction

[0025] As an aspect of the technical solution of the present invention, it relates to a method for preparing a zwitterionized high-strength pollution-resistant forward osmosis membrane, which includes:

[0026] providing a mixed reaction system comprising at least a zwitterionic monomer, a crosslinking agent, an initiator, a polymer and a solvent;

[0027] heating the mixed reaction system to cause free radical polymerization-micro-crosslinking reaction of zwitterionic monomers to form zwitterionic polymers to obtain membrane-forming solutions;

[0028] The membrane-forming solution is prepared into a membrane, and the zwitterionic polymer is modified on the surface of the membrane through surface segregation and a semi-interpenetrating network structure is formed in the membrane during the membrane-forming process, thereby obtaining zwitterionic high-strength resistance Fouling the forward osmosis membrane.

[0029] In some embodiments, the preparation method includes:

[0...

Embodiment 1

[0061] (1) 5 grams of polysulfone, 1 gram of 5-(2-methacryloyloxyethyl dimethylamino) pentanecarboxylic acid inner salt and 94 grams of dimethyl sulfoxide are added to the reaction kettle, and argon is ventilated , Stir continuously at 10°C until completely dissolved, forming a uniform and transparent mixed solution;

[0062] (2) Keep stirring and argon, add 0.01 g of N,N'-methylenebisacrylamide and 0.01 g of azobisisobutyronitrile into the reaction kettle, rapidly heat up to 60 ° C, 5-(2-methyl Acryloyloxyethyl dimethylamino) pentanecarboxylic acid inner salt undergoes free radical polymerization, and the polymerization time is 0.5 hour to obtain a film-making solution;

[0063] (3) Evenly scrape-coat the membrane-forming solution on the non-woven fabric, quickly immerse in water at 5° C. to solidify to form a membrane, and wash to obtain an amphoteric ionization high-strength pollution-resistant forward osmosis membrane.

[0064] After testing, the contact angle between the...

Embodiment 2

[0066] (1) 30 grams of sulfonated polysulfone, 20 grams of 3-(2-methacryloyloxyethyl dimethylamino) propanecarboxylic acid inner salt and 50 grams of N-methylpyrrolidone are added to the reaction kettle, and the Argon, 50 ℃ continuous stirring until completely dissolved, forming a uniform and transparent mixed solution;

[0067] (2) Keep stirring and argon, add 0.5 g of N,N'-vinylbisacrylamide and 0.8 g of azobisisoheptanonitrile into the reaction kettle, rapidly heat up to 100 ° C, 3-(2-methyl Acryloyloxyethyl dimethylamino) propanecarboxylic acid inner salt undergoes a radical polymerization reaction, and the polymerization time is 48 hours to obtain a film-making solution;

[0068] (3) Evenly scrape-coat the film-making solution on the non-woven fabric, quickly immerse it in a saturated sodium chloride aqueous solution at 100° C. to solidify to form a film, and wash to obtain an amphoteric ionized high-strength pollution-resistant forward osmosis membrane.

[0069] After t...

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Abstract

The invention discloses an amphoteric ionized high-strength pollution-resistant forward osmosis membrane and a preparation method thereof. The preparation method includes: adding zwitterionic monomers, cross-linking agents and initiators to the polymer solution, heating the zwitterionic monomers to undergo radical polymerization-micro-crosslinking reactions, forming zwitterionic polymers, and obtaining membrane-forming solutions , and then prepare a membrane to obtain a zwitterionized high-strength pollution-resistant forward osmosis membrane. The amphoteric ionized high-strength pollution-resistant forward osmosis membrane of the present invention has excellent anti-pollution ability, large forward osmosis flux, high mechanical strength, and at the same time, its preparation method is efficient and fast, and has broad industrial application prospects.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and in particular relates to an amphoteric ionization high-strength pollution-resistant forward osmosis membrane and a preparation method thereof. Background technique [0002] The vast majority of drinking water in the world today comes from surface water and groundwater. With the rapid development of society and the sharp increase in population, the groundwater level continues to decline, surface water is seriously polluted, and drinking water is extremely scarce. Seawater is an extremely rich water resource. At present, many water-poor countries are using seawater desalination technology to obtain drinking water, especially in coastal areas. The cost of seawater desalination is relatively low, and seawater desalination technology is more mature. [0003] The forward osmosis process is a newly emerging seawater desalination technology in recent years. It is a simulated natural pheno...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/06B01D69/02B01D67/00B01D61/00C02F1/44C02F103/08
CPCB01D61/002B01D67/0006B01D69/02B01D71/06B01D2325/18B01D2325/24B01D2325/30C02F1/445C02F2103/08
Inventor 曾志翔朱丽静王立平宋海明薛群基
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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