Composite membrane with hydrophilic separation layer

A separation layer and composite membrane technology, applied in the field of composite membranes, can solve the problems of low modifier density, large time consumption, complicated and cumbersome process, etc.

Inactive Publication Date: 2015-05-06
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Grafting is generally completed through very complicated multiple steps, and there are certain limitations: (1) After the completion of the hydrophilic modification, it is usually accompanied by a decrease in the permeation flux; (2) This type of hydrophilic modification

Method used

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  • Composite membrane with hydrophilic separation layer
  • Composite membrane with hydrophilic separation layer
  • Composite membrane with hydrophilic separation layer

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0014] Example 1

[0015] The water phase reaction liquid was prepared, and the water phase reaction liquid contained 2% (mass fraction) of O,O'-bis(2-amino inner group) polypropylene glycol-block-polyethylene glycol-block-polypropylene glycol (molecular weight) : 500), 0.05% (mass fraction) of sodium lauryl sulfate; an organic phase reaction solution was prepared, and the organic phase reaction solution was 0.5% (mass fraction) of trimesoyl chloride in n-hexane. The base membrane is a polysulfone flat membrane scraped on a non-woven fabric. First, immerse the base film in the aqueous reaction solution for 20 minutes at 25°C, take it out, immerse it in the organic reaction solution, and take out the interfacial polymerization time for 5 minutes. Clean the composite membrane with deionized water, and then apply the composite membrane at 40°C. The film is dried for 3 minutes, and finally dried at room temperature. Perform static contact angle measurement (SL200KB optical contact ...

Example Embodiment

[0016] Example 2

[0017] Prepare the water phase reaction solution. The water phase reaction solution contains 1% (mass fraction) of O,O'-bis(2-aminopropyl) polypropylene glycol-block-polyethylene glycol-block-polypropylene glycol (molecular weight) : 500), 0.05% (mass fraction) of sodium lauryl sulfate; an organic phase reaction solution was prepared, and the organic phase reaction solution was 0.5% (mass fraction) of trimesoyl chloride in n-hexane. Polyethersulfone porous membrane is the base membrane. First, immerse the polyethersulfone-based membrane in the aqueous reaction solution for 20 minutes at 25°C, take it out, immerse it in the organic phase reaction solution, interfacial polymerization time is 5 minutes, take it out, clean the composite membrane with deionized water, and then at 40°C The composite film is dried for 3 minutes, and finally dried at room temperature. Perform static contact angle measurement (SL200KB optical contact angle / boundary tension meter, Shan...

Example Embodiment

[0018] Example 3

[0019] The water phase reaction liquid was prepared. The water phase reaction liquid contained 2% (mass fraction) of O,O'-bis(2-aminopropyl) polypropylene glycol-block-polyethylene glycol-block-polypropylene glycol (molecular weight) :800), 0.05% (mass fraction) sodium lauryl sulfate; the organic phase reaction solution is prepared, and the organic phase reaction solution is 0.3% (mass fraction) trimesoyl chloride and 0.3% (mass fraction) isophthalic acid Formyl chloride in n-hexane. The polysulfone porous membrane is the base membrane. First, immerse the polyethersulfone-based membrane in the aqueous reaction solution for 10 minutes at 25°C, take it out, immerse it in the organic phase reaction solution, and take out the interfacial polymerization time for 6 minutes. Clean the composite membrane with deionized water, and then at 60°C. The composite membrane is dried for 6 minutes, and finally dried at room temperature. Perform static contact angle measureme...

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Abstract

The invention relates to the technology of macromolecular separation membrane, especially to a composite membrane with a hydrophilic separation layer. The separation layer of the composite membrane of the invention is prepared according to the following steps: preparing a separation layer on a porous supporting membrane by adopting an interfacial polymerizing method. According to the invention, an aqueous-phase reaction liquid used in the preparation process contains polyamine containing ethereal oxygen groups. The separation layer prepared according to the method disclosed by the invention has long-term stable hydrophilic properties, so that the separation layer can be used in processes such as nanometer-filtration, reverse osmosis, osmosis gasification and positive osmosis.

Description

technical field [0001] The invention relates to polymer separation membrane technology, in particular to a composite membrane with a hydrophilic separation layer. Background technique [0002] In order to achieve the purpose of anti-fouling or increasing flux, it is usually necessary to prepare hydrophilic membranes. The hydrophilicity of the membrane can generally be obtained in two ways, (1) to modify the membrane to be hydrophilic, and (2) to directly prepare a hydrophilic membrane by using a hydrophilic material. Hydrophilic modification is generally carried out on the surface of the membrane, which can be divided into physical modification and chemical modification. Physical modification mainly includes surface coating of hydrophilic polymers, such as polymers with oxygen atoms, nitrogen atoms, halogen atoms and other atoms in the main chain, and polymers with hydroxyl, amino, carboxyl and other groups in the side chain. Nanoparticles, etc. Physical modification has ...

Claims

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Application Information

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IPC IPC(8): B01D69/12B01D69/02B01D71/56B01D71/68B01D71/52B01D71/64
Inventor 赵红永丁晓莉康特张玉忠
Owner TIANJIN POLYTECHNIC UNIV
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