Aroma polyamide composite membrane with surface containing salicylaldehyde and quaternary ammonium salt and preparing method of aroma polyamide composite membrane

Abstract

The invention provides an aroma polyamide composite membrane with the surface containing salicylaldehyde and quaternary ammonium salt and a preparing method of the aroma polyamide composite membrane. The condensation reaction is carried out on the acyl chloride perssad on the surface of the aroma polyamide composite membrane and the organic polyamine to produce the aroma polyamide composite membrane with the surface containing amidogen; The Mannich reaction is carried out on the aroma polyamide composite membrane with the surface containing amidogen, the formaldehyde and the salicylaldehyde to produce the aroma polyamide composite membrane with the surface containing salicylaldehyde and tertiary amine; the aroma polyamide composite membrane with the surface containing the salicylaldehyde and the tertiary amine is reacted with the quaternary ammonium salt of the alkylate reagent to produce the aroma polyamide composite membrane with the surface containing the quaternary ammonium salt and the salicylaldehyde. The aroma polyamide composite membrane with the surface containing the salicylaldehyde and the quaternary ammonium salt is characterized in that the salicylaldehyde and the quaternary ammonium salt are distributed on the surface of the aroma polyamide composite membrane in a lattice mode; the quaternary ammonium salt functional group and the salicylaldehyde functional group are used for modifying the surface of the aroma polyamide composite membrane so that the hydrophilia of the surface of the aroma polyamide composite membrane can be improved, and the killing and antibiosis performance of the aroma polyamide composite membrane can be improved; the aroma polyamide composite membrane can be prevented from being subjected to chemical destruction.

Description

technical field [0001] The invention relates to a surface-functionalized aromatic polyamide composite membrane, in particular to an aromatic polyamide composite membrane containing salicylaldehyde and quaternary ammonium salt on the surface, which can be used for the preparation and processing of reverse osmosis membranes, ultrafiltration membranes and nanofiltration membranes. The application belongs to the field of functional polymer materials. technical background [0002] Today, with the rapid development of industry, the water pollution on the earth's surface is becoming more and more serious, and the source of fresh water is gradually shrinking. Therefore, how to obtain sufficient fresh water at minimum cost is an important issue for sustainable development. The ultra-thin composite membrane (including reverse osmosis membrane, ultrafiltration membrane and nanofiltration membrane, etc.) formed by coating and interfacial polymerization of aromatic polyamide on polyethe...

AI Technical Summary

Problems solved by technology

However, this type of technology does not solve the problem of chlorine and oxygen stability of aromatic polyamide composite membranes.

In addition, using the above method to modify the surface of the aromatic polyamide composite membrane has poor uniformity, which is easy to cause the micropore blockage of the aromatic polyamide composite membrane and reduce the permeability; The amide N-H reaction can effectively increase the hydrophilicity of the membrane surface and the stability of chlorine oxygen, but this method has the side effects of excessive crosslinking of the membrane surface and reduced membrane flux.

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