Method for preparing nano functionalized high-molecular ultrafiltration membrane

Abstract

The invention provides a method for preparing a nano functionalized high-molecular ultrafiltration membrane in order to fully use the nano effect of an inorganic nano material in the ultrafiltration membrane to improve the mechanical property, the hydrophillic nature and the anti-pollution performance of the membrane. The method comprises the following steps of: after completely dissolving film forming high molecules and a pore-forming additive, adding a pre-prepared inorganic nano sol; uniformly stirring and blending the mixture; directly spinning the mixture or performing curtain coating on the mixture to form a membrane; and soaking the spun mixture or the membrane in a coagulation bath to form the membrane. In the film forming process, a high-molecular gel split phase and a nano sol are hydrolyzed to form nano particles; and finally, the inorganic inorganic high-molecular ultrafiltration membrane with uniformly distributed nano particles is obtained.

Description

technical field [0001] The invention discloses a preparation method of a nano-functionalized polymer ultrafiltration membrane, belongs to the technical field of nano-modified membrane materials according to the International Patent Classification (IPC), and fully utilizes the nano-effect of the material, especially relates to nano-functionalized ultrafiltration. The preparation method of the membrane can greatly improve the water flux, anti-pollution ability and mechanical strength of the hybrid membrane. Background technique [0002] The macroscopic manifestations of membrane fouling are mainly the clogging of membrane pores, the formation of filter cake layer and the decrease of flux. The fouling mechanism depends on the physical and chemical interaction between the surface properties of the membrane and the substances in the water, including protein fouling, suspended solid fouling, colloid fouling, biological fouling, etc. With the deepening of research on the mechanism...

AI Technical Summary

Problems solved by technology

However, most of the modification methods are to directly add inorganic nanoparticles to the casting solution, mix them by ultrasonic and mechanical stirring, and simply disperse them in the polymer network, and the inorganic nanoparticles are difficult to disperse, high energy consumption, and easy to agglomerate. Inhomogeneous film structure is formed, and the nano effect cannot be fully exerted

There are also sol-gel preparations of hybrid membranes, but most of them add strong acid as a catalyst, which has poor solubility in the casting solution, resulting in faster generation of nanomaterials, instability, and local agglomeration. Aspects of performance can not be improved very well