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Method for modifying compound film surface

A surface modification and composite membrane technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve problems such as practical application limitations, achieve simple and safe operation, improve pollution resistance, and improve hydrophilicity and the effect of charge

Inactive Publication Date: 2008-01-30
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
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Problems solved by technology

However, these methods generally require specific experimental conditions or equipment, which limits practical applications.

Method used

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  • Method for modifying compound film surface

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Embodiment 1

[0032] The N,N-dimethylacetamide (DMAc) solution with a polysulfone concentration of 17.5% and a methyl cellosolve concentration of 14% is made into a casting solution at 80°C, and scraped to a certain thickness on a glass plate after defoaming , hydrogel prepared support membrane. Soak the polysulfone support membrane in 2.0% m-phenylenediamine aqueous solution for 2 minutes, drain it and react it in 0.1% trimesoyl chloride for 1 minute, take out the membrane and let it dry slightly, then immerse it in 5% aminopolyethylene glycol monomethyl ether The aqueous solution of 10min, post-treatment at 60 ℃ for 5min. The prepared composite membrane was washed with deionized water and then tested for anti-fouling.

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Abstract

The invention relates to a composite membrane surface modification method improving the pollution resistance performance of the separation membrane. Taking the porous membrane as the supporting body and taking the polyfunctionality acyl chloride and the amic as the polymeric monomer, the interface polymeric method is adopted for generating the polyamide desalination function layer which is then reacted with the hydrophilic monomer to implement the graft modification of the nascent state composite membrane. The invention has the advantages of simple and convenient operation, used for the preparation of surface modification of the composite membranes such as the reverse osmosis and nanofiltration, etc., with the interface polymeric method, the pollution resistance capability of the prepared composite membrane is improved.

Description

technical field [0001] The invention relates to a modification method for preparing a composite film by interfacial polymerization, and the method is surface chemical modification. Background technique [0002] Compared with the traditional separation technology, the membrane method has the advantages of high separation efficiency, energy saving, and environmental protection. It is a high-tech solution to alleviate the current energy crisis and environmental pollution. Among them, reverse osmosis and nanofiltration technology can be used to separate brine. After years of development, they have been widely used in seawater brackish water desalination, pure water and ultrapure water preparation. [0003] At present, the reverse osmosis and nanofiltration membranes most commercially used are polyamide composite membranes, including porous support layers and desalination functional layers. A typical polyamide composite membrane is obtained by interfacial polymerization of multi...

Claims

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Application Information

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IPC IPC(8): B01D67/00B01D69/12B01D71/82
Inventor 曹义鸣康国栋金培涛周美青袁权
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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