Prepn process of positively charged hybrid organic-inorganic film

Abstract

The preparation process of positively charged hybrid organic-inorganic film features that benzyl bromide substituted polyphenyl ether, aminoalkyl silone and tertiary amine are first stirred in solvent to react to obtain the mixed solution containing positively charged sol-gel reaction precursor and unreacted aminoalkyl silone; water and catalyst are then added to make the precursor and the unreacted aminoalkyl silone produce sol-gel reaction; and through further coating and drying, the positively charged hybrid organic-inorganic film is produced. The preparation process of the present invention is fast and simple, and adopts easy-to-obtain material and no seriously toxic material; and the prepared positively charged hybrid organic-inorganic film has well compatible organic phase and inorganic phase, high organic phase content, great varying range and high heat resistance.

Description

Technical field: [0001] The invention belongs to the field of membrane technology, in particular to a method for preparing a positively charged organic-inorganic hybrid membrane based on polyphenylene ether (PPO) by using a sol-gel method. Background technique: [0002] Positively charged membranes are widely used in desalination of seawater (brackish water), dehardening of tap water, recovery of useful metals in sewage, treatment of electrophoretic paint wastewater, and electrochemical sensors. Currently, positively charged organic polymer membranes are widely used. Due to the characteristics of organic materials, these membranes usually have poor mechanical strength and chemical stability. Applications. One way to improve these defects of positively charged organic membranes is to integrate the advantages of inorganic materials such as good mechanical strength and stability, chemical and biological erosion resistance, and long service life into organic positively charged ...

AI Technical Summary

Problems solved by technology

[0006] Chinese Patent Application No. 03132271.9 discloses a method for preparing a positively charged organic-inorganic hybrid film, which involves aminolysis of polyfunctional alkoxysilanes and polymer compounds containing ester groups or epoxy side groups or end groups. Alcoholysis or ring-opening reaction, followed by quaternization of the product to obtain a positively charged sol-gel reaction precursor; although the positively charged hybrid membrane prepared by this method overcomes the gap between the organic phase and the inorganic phase Poor compatibility, low flexibility of the membrane and other technical defects, and the use of more toxic substances is avoided in the preparation of the membrane, but the preparation of the precursor requires a two-step reaction

[0007] "Journal of Membrane Science" (Journal of Membrane Science, 2001, 190: 159-166) reported that benzyl brominated polyphenylene oxide (BPPO) was directly quaternized by trimethylamine to prepare a positively charged membrane. Positively charged membranes belong to the category of organic homogeneous anion exchange membranes. Since no inorganic components are introduced, the heat resistance of the membranes is poor.