Modification method for ultrafiltration membranes, modified ultrafiltration membrane and method adopting ultrafiltration membrane for filtration

Abstract

The invention provides a modification method for ultrafiltration membranes. The method includes the following steps: performing a first modification treatment to a macromolecular ultrafiltration membrane, wherein the first modification treatment includes amination treatment or carboxylation treatment; performing a second modification treatment to the macromolecular ultrafiltration membrane subjected to the first modification treatment to obtain a modified ultrafiltration membrane, wherein the second modification treatment is amidation between the macromolecular ultrafiltration membrane subjected to the first modification treatment and oligodeoxynucleotide adopting a hairpin structure, when the first modification treatment is amination, the oligodeoxynucleotide contains the carboxyl, and when the first modification treatment is carboxylation, the oligodeoxynucleotide contains the amido. According to the technical scheme, the reaction procedures are simple, the hairpin oligodeoxynucleotide can be synthesized according to man-made designs, the connection size is controllable, the protein blockage preventing efficiency of the connected macromolecular ultrafiltration membrane is high, the adsorbability to protein can be controlled through regulating and controlling the pH value of the medium to be filtered, and the application prospect is wide.

Description

technical field [0001] The invention relates to the field of biochemical industry, in particular to a modification method of a polymer ultrafiltration membrane, a modified polymer ultrafiltration membrane, and a modified polymer ultrafiltration membrane applied to filtration Methods. Background technique [0002] Ultrafiltration membrane is a microporous filtration membrane with consistent pore size and rated pore size range of 0.001-0.02 microns. By applying appropriate pressure on one side of the membrane, solute molecules smaller than the pore size can be screened out to separate particles with a molecular weight greater than 500 Daltons (atomic mass units) and a particle size greater than 10 nanometers. [0003] At present, polymer materials such as polyacrylonitrile are widely used in the preparation of ultrafiltration membranes due to their excellent properties such as good chemical stability and heat resistance. Membranes prepared with these polymer materials can be...

AI Technical Summary

Problems solved by technology

The former affects the formation of the membrane pore structure due to the introduction of a large number of mixtures; the choice of the latter's hydrophilic polymer is the key, but the hydrophilic polymer itself is relatively limited.