Pollution-resistant chlorine polyamide-resistant reverse osmosis composite membrane and preparation method thereof

Abstract

The invention discloses a pollution-resistant chlorine polyamide-resistant reverse osmosis composite membrane and a preparation method thereof. The preparation method comprises the following steps of 1, immersing a polyamide layer of a pollution-resistant chlorine polyamide-resistant reverse osmosis composite membrane raw material in an isopropanol aqueous solution, taking out it, and washing it by pure water, and 2, immersing the treated polyamide layer in a mixed solution, taking out it, putting it into an oven for a certain time, and washing the dried polyamide layer by pure water to obtain the pollution-resistant chlorine polyamide-resistant reverse osmosis composite membrane, wherein the mixed solution is a water solution containing a compound shown in the formula (I) and glutaraldehyde; and in the formula (I) , R1 represents H or -CH3, R2 represents H or -CH3, R3 represents Cl, Br or I, R4 represents -CH3 or -C6H5, X is in a range of 1-100000, Y is in a range of 1-100000 and Z is in a range of 1-100000. The pollution-resistant chlorine polyamide-resistant reverse osmosis composite membrane has high pollution resistance and chlorine resistance. The preparation method has the simple processes.

Description

technical field [0001] The invention belongs to the polymer composite membrane in the field of water treatment, and in particular relates to a preparation method of a reverse osmosis composite membrane with anti-pollution and chlorine-resistant properties. technical background [0002] Polyamide reverse osmosis composite membrane has become the mainstream of commercial reverse osmosis membrane due to its high rejection rate and flux. Medicine and other fields have been widely used, and have achieved good economic and social benefits; in recent years, with the increasing shortage of global water resources and water pollution, reverse osmosis technology has been more and more popular in the fields of seawater desalination and water reuse. Wide application and attention. [0003] However, polyamide reverse osmosis composite membranes are susceptible to fouling, causing a decrease in water flux and rejection. Among them, the more common pollution is microbial and organic pollu...

AI Technical Summary

Problems solved by technology

The most common way to control microbial pollution is to add hypochlorous acid or sodium hypochlorite to the raw material solution, however, the chlorine resistance and oxidation resistance of polyamide reverse osmosis composite membranes are extremely poor (the residual chlorine in the feed water of general commercial reverse osmosis membranes is required to be below 0.1ppm ), which requires strict control of the concentration of free residual chlorine in reverse osmosis feed water, which puts forward high requirements for pretreatment, resulting in increased operating costs

However, there is no report on improving the anti-pollution and chlorine resistance properties of polyamide reverse osmosis composite membranes by surface coating.

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