A kind of large-flux enhanced ultrafiltration membrane and preparation method thereof

Abstract

The invention relates to a high-flux reinforced ultrafiltration membrane, which is composed of the following components in parts by weight: 30-40 parts of dopamine-modified polyvinyl chloride; 10-20 parts of a hydrophilic agent; and 40-50 parts of a polar solvent ; 10-20 parts of porogen; 5-15 parts of auxiliary agent. The present invention adopts hydrophilic agent, auxiliary agent and dopamine-modified polyvinyl chloride to be blended and modified in polar solvent, so as to reduce the surface tension of the membrane surface and the inner wall of the membrane hole, and improve the hydrophilicity of polyvinyl chloride. The polar bonds in the triethanolamine and the auxiliary and the polar bonds in the dopamine composite layer produce hydrogen bonds and attract each other, so that the hydrophilicity can be maintained for a long time, the anti-fouling property of the ultrafiltration membrane can be improved, and the UF membrane can be maintained for a long time. High operating flux; in addition, the small molecule porogen is not easy to block pores, has good film-forming performance, good pure water flux, low degree of entanglement with the main material, and is easy to detach from the surface of the film; the auxiliary agent can effectively improve the melt processability , the mechanical properties are greatly enhanced.

Description

technical field [0001] The invention relates to the technical field of ultrafiltration membranes, in particular to a large-flux enhanced ultrafiltration membrane and a preparation method thereof. Background technique [0002] Ultrafiltration is a membrane separation process that takes pressure difference as the driving force and uses the sieving mechanism to intercept macromolecular solutes and separate them from solvents or small molecular solutes according to the size of the substance. The effective pore size of the ultrafiltration membrane used is between 2 ~100nm. Utilizing the screening effect of the micropores on the surface of the ultrafiltration membrane, the separation and purification of substances with different molecular weights can be realized, and it has a good effect on the removal of particles, colloids, bacteria and various organic substances. In recent years, it has been widely used in water treatment, food, Electronics, machinery, chemical industry, petro...

AI Technical Summary

Problems solved by technology

The ultrafiltration membranes in the prior art have poor hydrophilicity, are easy to absorb pollutants during use, and have defects such as reduced treatment efficiency, which need further improvement