Temperature-sensitive filtering membrane with small pore size distribution and preparation method thereof

Abstract

A temperature-sensitive filtering membrane with small pore size distribution is designed and prepared based on the thought of bionics by taking a metal chloride saline solution as a solvent in order to solve the problems that a large number of organic solvents hard to recycle are used in the traditional film preparation process, consequently, environmental pollution is caused, a polymeric membrane material is wide in membrane pore size distribution, and the membrane is in lack of responsiveness and is likely to be contaminated. Firstly, a temperature-sensitive polymer N-isopropylacrylamide is prepared in the metal chloride saline solution in a polymerization mode, and then N-isopropylacrylamide is homogeneously grafted with polyacrylonitrile to obtain a membrane casting solution; then the membrane casting solution is placed in a coagulating bath of water, metal ions and chloridions are gradually dispersed into the water, and a N-isopropylacrylamide grafted polyacrylonitrile polymer is subjected to phase transformation to form the membrane. The metal ions and the chloridions achieve a hole forming function, N-isopropylacrylamide and polyacrylonitrile are subjected to microphase separation, and a hydrophili channel subjected to ion hole forming is formed in the interface of N-isopropylacrylamide and polyacrylonitrile. The filtering membrane is expected to be used for the fields of fine separation, temperature response membrane on-off and the like.

Description

technical field [0001] The invention relates to a filter membrane with temperature-sensitive narrow pore size distribution and a preparation method thereof, belonging to the field of polymer materials and membranes. Background technique [0002] Membrane technology has been widely used in water treatment due to its advantages of high efficiency, low energy consumption and low investment cost. my country began to explore nanofiltration membrane technology in the 1990s [Chemical Equipment Technology, 2002, 23(8): 14-17]. The research parties involved in this technology include Hangzhou Water Treatment Center of State Oceanic Administration, Beijing Ecological Environmentalization Center, The Dalian Institute of Chemical Physics of the Chinese Academy of Sciences, the Shanghai Institute of Atomic Nucleus, and Tianjin University of Technology, etc., are still mostly in the laboratory stage of research on nanofiltration membranes. Due to the limitations of various conditions, more...

AI Technical Summary

Problems solved by technology

[0006] Aiming at the deficiencies of the prior art, the technical problem to be solved by the present invention is that the membrane-making process inevitably uses organic solvents to cause environmental pollution, the membrane pore size distribution is wide, the membrane lacks temperature responsiveness and is easily polluted, etc.

[0007] The technical solution of the present invention to solve the problems of environmental pollution caused by the inevitable use of organic solvents in the membrane-making process, wide membrane pore size distribution, lack of temperature responsiveness and easy pollution of the membrane is to design a temperature-sensitive filter membrane with narrow pore size distribution