Process for preparing ethylenediaminetetraacetic dianhydride modified polyvinylidene fluoride separation membrane and resin

Abstract

The invention provides a process for preparing an ethylenediaminetetraacetic dianhydride modified polyvinylidene fluoride separation membrane and an ethylenediaminetetraacetic dianhydride modified polyvinylidene fluoride resin by using reagents such as ethylenediaminetetraacetic dianhydride, sodium hydroxide, sodium borohydride, tetrabutyl ammonium bromide, p-toluenesulfonic acid, N,N-dimethyl acetamide, polyvinylpyrrolidone and the like as raw materials and using chemical blending / phase transfer technology. The process has the advantages of simple operation, uniform blending and the like. According to the technology, a ethylenediaminetetraacetic acid multi-amino multi-carboxylate compound is uniformly blended in the polyvinylidene fluoride separation membrane and the polyvinylidene fluoride resin so as to effectively improve the hydrophilic properties of the polyvinylidene fluoride ultra-filtration separation membrane and the resin, realize removal of complex heavy metal ions in wastewater by using the polyvinylidene fluoride separation membrane and the polyvinylidene fluoride resin, improve the drinking water purification efficiency of the polyvinylidene fluoride separation membrane and the polyvinylidene fluoride resin, propel the removal and resource utilization of heavy metal pollutants and expand the application of the polyvinylidene fluoride separation membrane and the polyvinylidene fluoride resin in the water treatment field.

Description

technical field [0001] The present invention relates to the performance improvement of polyvinylidene fluoride macromolecular materials, in particular to a method using ethylenediaminetetraacetic dianhydride, sodium hydroxide, sodium borohydride, tetrabutylammonium bromide, p-toluenesulfonic acid, N, N-dimethylacetamide and other reagents are used as raw materials, and chemical blending / phase transfer technology is used to modify the preparation process of polyvinylidene fluoride separation membranes and resins. Background technique [0002] Polyvinylidene fluoride separation membrane technology has the advantages of normal temperature operation, no phase change, obvious energy saving effect, high filtration accuracy, low production pollution, large water output and good quality. Through the screening and interception of the membrane, it has an excellent removal effect on suspended particles and colloidal pollutants in the water body. Polyvinylidene fluoride separation memb...

AI Technical Summary

Problems solved by technology

However, surface grafting modification will have adverse effects on the physical properties of the separation membrane and resin, such as changing the microporous structure and pore size distribution on the surface of the separation membrane and resin, the grafted hydrophilic groups will fall off, and the grafted acrylic acid will polymerize. Polyvinylidene fluoride separation membranes and resins with polyvinylidene fluoride and sulfonic acid functional groups have low removal efficiency for complexed heavy metal ions in water

In addition, polyvinylidene fluoride separation membranes and resins are modified by using ethylenediaminetetraacetic acid, diethylenetriaminepentaacetic acid and melamine, which can realize the blending and bonding of polyaminopolycarboxylic acid functional groups with chelating coordination. branches into polyvinylidene fluoride separation membranes and resins, but the reaction often requires high temperatures above 160°C, and the control of reaction conditions is very strict

The existence of these problems will affect the performance of polyvinylidene fluoride separation membranes and resins, and ultimately limit the application of polyvinylidene fluoride separation membranes and resins in the field of water treatment