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Crosslinking modified polyamide composite film and preparation method thereof

A cross-linking modification, polyamide technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of water flux decline, increase membrane permeability resistance, etc., to enhance separation performance and maintain compactness properties, and the effect of enhancing chlorine resistance

Active Publication Date: 2016-03-23
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Although the above surface modification method can effectively improve the chlorine resistance of the membrane, the additional protective layer also increases the osmotic resistance of the membrane, which significantly reduces the water flux of the membrane.

Method used

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  • Crosslinking modified polyamide composite film and preparation method thereof
  • Crosslinking modified polyamide composite film and preparation method thereof
  • Crosslinking modified polyamide composite film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～3

[0069] (1) Mixing a phosphoric acid solution with a volume percentage concentration of 80% and a formaldehyde solution with a volume percentage concentration of 40% at a volume ratio of 1:50 to obtain a reducing solution, and heating the reducing solution oil bath to a predetermined temperature and constant temperature;

[0070] (2) Immerse the polyamide composite membrane containing amino groups on the surface in a constant temperature reducing solution, react at a suitable stirring speed for 2 hours, take out the membrane and place it in deionized water to shake and wash to remove the remaining reducing solution in the membrane until it is cleaned There is no obvious formaldehyde smell in the liquid, and the polyamide composite film (N-MethylolPA, denoted as MH-PA) modified by N-methylolation is obtained;

[0071] (3) Use concentrated HCl to adjust the pH of the glutaraldehyde solution with a concentration of 2% by weight to 5, immerse the MH-PA in the above glutaraldehyde so...

Embodiment 4～5

[0074] (1) Mix a phosphoric acid solution with a concentration of 80% by volume and a formaldehyde solution with a concentration of 40% by volume at a volume ratio of 1:50 to obtain a reducing solution, and heat the reducing solution to an oil bath of 60° C. and keep the temperature constant;

[0075] (2) Immerse the polyamide composite membrane containing amino groups on the surface in a constant temperature reducing solution, react at a suitable stirring speed for 2 hours, take out the membrane and place it in deionized water to shake and wash to remove the remaining reducing solution in the membrane until it is cleaned There is no obvious formaldehyde smell in the liquid, and MH-PA is obtained;

[0076] (3) Use concentrated HCl to adjust the pH of the dialdehyde solution with a concentration of 2% by weight to 5, immerse MH-PA in the above dialdehyde solution, stir and react for 4 hours, take out the membrane and place it in deionized water for shaking and cleaning to remove...

Embodiment 6～8

[0079] (1) Mix an acetic acid solution with a volume percentage concentration of 80% and a formaldehyde solution with a volume percentage concentration of 40% at a volume ratio of 1:50 to obtain a reducing solution, and heat the reducing solution oil bath to a predetermined temperature and keep the temperature constant;

[0080] (2) Immerse the polyamide composite membrane containing amino groups on the surface in a constant temperature reducing solution, react at a suitable stirring speed for 2 hours, take out the membrane and place it in deionized water to shake and wash to remove the remaining reducing solution in the membrane until it is cleaned There is no obvious formaldehyde smell in the liquid, and MH-PA is obtained;

[0081] (3) Use concentrated HCl to adjust the pH of the glutaraldehyde solution with a concentration of 2% by weight to 5, immerse the MH-PA in the above glutaraldehyde solution, stir and react for 4 hours, take out the membrane and place it in deionized ...

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Abstract

The invention discloses a crosslinking modified polyamide composite film and a preparation method thereof. The preparation method comprises the steps that 1, an acid solution and a formaldehyde solution are mixed to be uniform to obtain a stock solution, and the stock solution is heated to preset temperature and kept at constant temperature, wherein acid is at least one of phosphoric acid, acetic acid and boric acid; 2, a polyamide composite film with amidogen on the surface is immersed into the stock solution at the constant temperature, the film is taken out after stirring and reaction, and an N-hydroxylation modified polyamide composite film is obtained after the stock solution is removed through washing; 3, the N-hydroxylation modified polyamide composite film is immersed into a crosslinking agent solution, the film is taken out after stirring and reaction, and the crosslinking modified polyamide composite film is obtained after the crosslinking agent is removed through washing, wherein the crosslinking agent is at least one of glutaraldehyde, adipaldehyde and butanedial. By means of the preparation method, the separation performance of the polyamide composite film is not obviously damaged, and meanwhile the chlorine resistance of the polyamide composite film is enhanced.

Description

technical field [0001] The invention relates to the field of reverse osmosis composite membranes, in particular to a cross-linked modified polyamide composite membrane and a preparation method thereof. Background technique [0002] The water resource crisis is one of the three major crises faced in the 21st century. Accelerating the recycling of waste water and the desalination of seawater and brackish water are effective ways to solve the water resource crisis. Reverse osmosis membrane technology has been widely used in the fields of seawater brackish water desalination and waste water recycling due to its advantages of compact device structure, simple installation, small footprint, and low energy consumption. It is the most promising water treatment technology. one. [0003] As the core of this technology, the reverse osmosis membrane material has been developed from the early cellulose acetate membrane to the current mainstream polyamide membrane. Polyamide membrane has...

Claims

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Application Information

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IPC IPC(8): B01D71/56B01D69/12B01D67/00
Inventor 张林曾艳军黄海侯立安
Owner ZHEJIANG UNIV
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