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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

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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 is mainly carried out Surface modification, modifier density is low; (3) Chemical modification requires the introduction of additional activation groups, making the process more complicated and time-consuming, which limits the promotion and application of these methods

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

Embodiment 1

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

Embodiment 2

[0017] Preparation of aqueous phase reaction liquid, containing 1% (mass fraction) O in the aqueous phase reaction liquid, O'-two (2-aminopropyl) polypropylene glycol-block-polyethylene glycol-block-polypropylene glycol (molecular weight : 500), 0.05% (mass fraction) of sodium lauryl sulfate; prepare the organic phase reaction solution, the organic phase reaction liquid is the n-hexane solution of 0.5% (mass fraction) trimesoyl chloride. The polyethersulfone porous membrane is used as the base membrane. First, at 25°C, immerse the polyethersulfone base membrane in the aqueous phase reaction solution for 20 minutes, take it out, immerse it in the organic phase reaction solution, and take out the interfacial polymerization time for 5 minutes, take it out, wash the composite membrane with deionized water, and then in 40°C Dry the composite film for 3 minutes, and finally dry it at room temperature. The static contact angle was measured (SL200KB optical contact angle / interface te...

Embodiment 3

[0019] Preparation of aqueous phase reaction liquid, containing 2% (mass fraction) O in the aqueous phase reaction liquid, O'-two (2-aminopropyl) polypropylene glycol-block-polyethylene glycol-block-polypropylene glycol (molecular weight : 800), 0.05% (mass fraction) of sodium lauryl sulfate; prepare the organic phase reaction solution, the organic phase reaction liquid is 0.3% (mass fraction) trimesoyl chloride and 0.3% (mass fraction) isophthaloyl dichloride Formyl chloride in n-hexane. The polysulfone porous membrane is used as the base membrane. First, at 25°C, immerse the polyethersulfone base membrane in the aqueous phase reaction solution for 10 minutes, take it out, immerse it in the organic phase reaction solution, take out the interfacial polymerization time for 6 minutes, take it out, wash the composite membrane with deionized water, and then immerse it in the temperature of 60°C The composite film was dried for 6 minutes, and finally dried at room temperature. Th...

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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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