Composite nanofiltration membrane based on hydrophilic modified polyolefin microporous substrate and preparation method thereof

A technology of polyolefin microporous membrane and composite nanofiltration membrane, which is applied in the direction of chemical instruments and methods, membrane, membrane technology, etc., can solve the problems of substrate surface morphology damage, poor surface hydrophilicity, membrane structure collapse, etc., and achieve hydrophilic The water layer is thin and uniform, reducing the film resistance of the base film and improving the performance

Inactive Publication Date: 2017-07-25
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, the surface of traditional polyolefin microporous membranes is very poor in hydrophilicity, and the water phase in the interfacial polymerization process is difficult to disperse evenly on its surface, so it is difficult to successfully prepare a uniform and defect-free selective skin layer on its surface, which is also a constraint on polyolefin microporous mem

Method used

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  • Composite nanofiltration membrane based on hydrophilic modified polyolefin microporous substrate and preparation method thereof
  • Composite nanofiltration membrane based on hydrophilic modified polyolefin microporous substrate and preparation method thereof
  • Composite nanofiltration membrane based on hydrophilic modified polyolefin microporous substrate and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0050] A tannic acid-diethylenetriamine system is used as a co-deposition system, wherein the molar ratio of tannic acid-diethylenetriamine is 1:10. The polypropylene microporous substrate was submerged in the co-deposition solution, taken out after 6 hours, washed repeatedly with deionized water, and dried overnight.

[0051] Prepare an aqueous solution of piperazine at a concentration of 2 g / L, and prepare a n-hexane solution of trimesoyl chloride at a concentration of 1 g / L. Immerse the co-deposited substrate in the piperazine aqueous solution, take it out after its surface is fully infiltrated by the aqueous solution, dry it in the air, and then immerse it in the n-hexane solution of trimesoyl chloride, and react at 25 °C 2min. After the reaction, the composite membrane was taken out and washed repeatedly with deionized water to obtain a composite nanofiltration membrane.

[0052] Electron micrographs of the polypropylene microporous substrate, the hydrophilically modifi...

Embodiment 2～8

[0054] The concentrations of piperazine and trimesoyl chloride were adjusted in the interfacial polymerization reaction, and the rest of the reaction conditions were the same as in Example 1.

Embodiment 9～11

[0061] Post-treatment of composite nanofiltration membranes with organic solvents.

[0062] In Example 9 and Example 10, the composite nanofiltration membrane prepared in Example 1 was respectively immersed in analytically pure ethanol and acetone, taken out after 24 hours, and washed repeatedly with deionized water to obtain post-treated composite nanofiltration membrane.

[0063] Example 11 The composite nanofiltration membrane prepared in Example 1 was immersed in analytically pure dimethylformamide, taken out after 10 minutes, and washed repeatedly with deionized water to obtain a post-treated composite nanofiltration membrane.

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Abstract

The invention discloses a composite nanofiltration membrane based on a hydrophilic modified polyolefin microporous substrate and a preparation method thereof. The composite nanofiltration membrane comprises a substrate and a selective cortex formed on the substrate through an interfacial polymerization reaction, and the substrate is a polyolefin microporous membrane subjected to hydrophilic modification through sedimentation; the selective cortex is formed by the interfacial polymerization reaction of an aqueous phase monomer and an oil phase monomer on the surface of the substrate; the aqueous phase monomer is at least one of piperazine, m-phenylenediamine and o-phenylenediamine; and the oil phase monomer is trimesoyl chloride. The substrate of the composite nanofiltration membrane is the polyolefin microporous membrane subjected to the hydrophilic modification through the sedimentation, a formed hydrophilic layer is thin and uniform, the surface topography of the substrate is unchanged, and the selective cortex formed on the hydrophilic layer through the interfacial polymerization is dense, uniform and defect-free, so that water flux of the composite nanofiltration membrane is large; the polyolefin microporous substrate has good tolerance for organic solvents, so that the use range of the composite nanofiltration membrane is improved.

Description

technical field [0001] The invention relates to the field of preparation of composite nanofiltration membranes, in particular to a composite nanofiltration membrane based on a hydrophilic modified polyolefin microporous substrate and a preparation method thereof. Background technique [0002] Since the 1980s, nanofiltration technology has emerged and has been widely used in wastewater treatment, seawater desalination, and water softening. Nanofiltration membranes have a high rejection rate for polyvalent salt ions and some organic molecules (molecular weight 200-1000). At the same time, compared with reverse osmosis technology, nanofiltration technology has a larger permeation flux at a lower operating pressure, so it has attracted extensive attention from industry and science. The optimization of the nanofiltration process and the preparation of the nanofiltration membrane are also one of the current research hotspots. [0003] Composite membrane is a very important type ...

Claims

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Application Information

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IPC IPC(8): B01D71/26B01D69/12B01D69/02B01D67/00B01D61/02
CPCB01D61/027B01D67/0002B01D69/02B01D69/12B01D71/26B01D2325/36
Inventor 徐志康张郗林福文杜勇邱文泽
Owner ZHEJIANG UNIV
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