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A kind of cross-linked zwitterionic group modified forward osmosis membrane and preparation method thereof

A zwitterion, forward osmosis membrane technology, applied in the field of membrane separation, can solve the problems of poor controllability, poor solubility, difficult film formation, etc., to achieve large-scale development and production, high production efficiency, improved stability and The effect of durability

Active Publication Date: 2021-11-26
宁波蓝盾新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Zwitterionic polymers have poor solubility in organic solvents, making it difficult to prepare films by classical blending methods
Surface grafting and surface coating methods often involve multi-step reactions, low efficiency, and poor controllability

Method used

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Examples

Experimental program
Comparison scheme
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 cross-linked zwitterionic group-modified forward osmosis membrane, which includes:

[0026] Provide a mixed reaction system comprising at least a polymer, a zwitterionic precursor containing a tertiary amine group, a hydrophilic monomer, an initiator and a solvent;

[0027] heating the mixed reaction system to cause free radical copolymerization of the zwitterionic precursor containing tertiary amine groups and hydrophilic monomers to form a random copolymer comprising zwitterionic polymers and hydrophilic polymers , to obtain a film-making solution;

[0028] The membrane-forming solution is prepared into a membrane, which is immersed in a coagulation bath and then in a cross-linking bath to obtain a forward osmosis membrane modified with cross-linked zwitterionic groups.

[0029] In some embodiments, the preparation method may include:

[0030] Provide a mixed reac...

Embodiment 1

[0067] (1) 4 grams of polysulfone, 25 grams of dimethylaminoethyl methacrylate, 2 grams of acrylic acid, 2 grams of azobisisobutyronitrile and 77 grams of N-methylpyrrolidone are added to the reaction kettle, and the argon gas is continued. Stir until completely dissolved to form a uniform and transparent mixed solution, then rapidly raise the temperature to 120°C, dimethylaminoethyl methacrylate and acrylic acid undergo radical copolymerization and reaction, and the polymerization time is 0.2 hours to obtain a film-forming solution;

[0068] (2) Apply the film-making solution to the non-woven fabric, and quickly immerse it in a coagulation bath consisting of 5 grams of 1,3-propane sultone and 95 grams of water at 0°C to react the tertiary amine groups to form zwitterions group to obtain a zwitterionic group-modified forward osmosis membrane;

[0069] (3) Immerse the forward osmosis membrane modified by the zwitterionic group in a cross-linking bath composed of 1 gram of gluta...

Embodiment 2

[0072] (1) Mix 35 grams of sulfonated polysulfone, 0.5 grams of diethylaminoethyl methacrylate, 15 grams of hydroxyethyl methacrylate, 0.01 grams of azobisisoheptanonitrile and 49.49 grams of N,N'-dimethyl Add methyl formamide into the reaction kettle, blow argon, and continue to stir until it is completely dissolved. After forming a uniform and transparent mixed solution, the temperature is rapidly raised to 60°C, and diethylaminoethyl methacrylate and hydroxyethyl methacrylate are free Based copolymerization reaction, the time is 24 hours, obtains the film-making solution;

[0073] (2) Apply the film-making solution on the non-woven fabric, and quickly immerse it in a coagulation bath composed of 60 grams of 3-bromopropionic acid and 40 grams of ethanol at 80 ° C to react the tertiary amine groups to generate zwitterionic groups, and obtain Zwitterionic group modified forward osmosis membrane;

[0074] (3) Immerse the forward osmosis membrane modified by the zwitterionic gr...

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Abstract

The invention discloses a forward osmosis membrane modified by cross-linking zwitterionic groups and a preparation method thereof. The preparation method comprises: providing a mixed reaction system comprising a polymer, a zwitterionic precursor containing a tertiary amine group, a hydrophilic monomer, an initiator and a solvent, heating the mixed reaction system to make the tertiary amine group-containing The zwitterionic precursor and the hydrophilic monomer undergo a radical copolymerization reaction to form a random copolymer comprising the zwitterionic polymer and the hydrophilic polymer to obtain a membrane-forming solution; the membrane-forming solution is prepared into a membrane , and first immersed in a coagulation bath, and then immersed in a cross-linking bath to obtain a cross-linked zwitterionic group-modified forward osmosis membrane. The forward osmosis membrane prepared by the method of the invention has the characteristics of strong hydrophilicity, large water flux, strong anti-pollution ability, etc., and at the same time, the preparation process is simple and easy, which is beneficial to large-scale development and production, and has broad prospects for industrial application.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and in particular relates to a forward osmosis membrane modified by a cross-linked zwitterionic group and a preparation method thereof. Background technique [0002] With the rapid consumption of fresh water resources and the aggravation of water pollution, the problem of scarcity of fresh water resources has become increasingly prominent. Membrane water treatment technology is the most effective means to solve this problem. Organic separation membranes are also called polymer separation membranes or polymer separation membranes, usually made of polymer or polymer composite materials, with good flexibility, high air permeability, low density, low cost, simple preparation process and wide source of materials etc. advantages. However, when polymer membranes made of materials such as polysulfones, fluoropolymers, and polyolefins with strong hydrophobicity are used for water treatment, i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D61/00B01D67/00
CPCB01D61/002B01D69/125
Inventor 宋维广
Owner 宁波蓝盾新材料科技有限公司