Method for preparing porous separation membrane

Abstract

The invention publishes a method for producing porous separation membrane, especially involves a multi-layer extrusion molding method. Its characteristic is: completing the extrusion molding of different high polymer solution at the same time. Then realizing separation among different high polymer solution through the inversion of phase's method. Lastly, solidifying to become membrane. In the solidification process, the compound level peel support level, the support level becomes the porous separation membrane which needs. This invention uses the multi-layered system membrane technology, and uses compound level to control the membrane structure, which is simple manufacture, overcome many technology insufficient existing in porous membrane material preparation. The pore membrane has the very big percentage open area, when it filters the high suspension liquid, and can hold the massive pollutant, so that it has high current capacity and low clean frequency.

Description

technical field

[0001] The invention discloses a method for preparing a porous separation membrane, in particular to a method for preparing a porous separation membrane by a multilayer extrusion molding method. technical background

[0002] The preparation of polymer membranes can be traced back to the invention of microporous membranes in 1907. At that time, the preparation of microporous membranes was mainly based on the dry method (H. Bechhold, Investigation on colloids by filtration method, Biochem. Z., 6 (1907) 397). The dry microporous membrane preparation process includes: polymer solution configuration, molding, and then phase-separation solidification in a temperature and humidity-controlled environment to form a membrane. The dry membrane generally forms a symmetrical membrane structure. In the 1860s, the discovery of asymmetric membranes introduced the concept of wet (immersion) preparation of polymer membranes. Thanks to the development of phase separation the...

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