Reverse osmosis composite membrane, water treatment device and preparation method

Abstract

The invention provides a reverse osmosis composite membrane, a water treatment device and a preparation method. The preparation method of the reverse osmosis composite membrane includes: providing a polyolefin support membrane, and performing surface hydrophilic modification treatment on it; immersing the obtained structure in polyamine The first immersion treatment is carried out in the aqueous solution; the obtained structure is immersed in the polyacyl chloride organic solvent for the second immersion treatment, and interfacial polycondensation reaction occurs to form a reverse osmosis functional layer to obtain a reverse osmosis composite membrane. The polyolefin support membrane of the present invention has excellent pore size controllability and pore size uniformity, simplifies the structure of the reverse osmosis composite membrane, and reduces processing steps; the polyolefin support membrane is endowed with excellent hydrophilicity in an online manner, increasing the polyolefin support membrane. The water flux and surface energy of the olefin support film make it have a good interfacial bonding force with the polyamide functional coating; the wet / dry process polyolefin support film used has high mechanical strength and thin thickness It can effectively increase the effective membrane area per unit volume.

Description

technical field [0001] The invention belongs to the field of polymer reverse osmosis membrane separation, and in particular relates to a reverse osmosis composite membrane, a water treatment device and a preparation method. Background technique [0002] Due to its high efficiency and environmental protection, reverse osmosis membranes are widely used in household water purification, industrial wastewater treatment, municipal sewage treatment, seawater desalination and other fields. With the expansion of applications, the performance requirements for reverse osmosis membranes are also getting higher and higher. Generally speaking, the reverse osmosis membrane mainly consists of three parts: non-woven fabric support layer, polymer porous support layer formed on the non-woven fabric by scraping method, and polyamide desalination function formed by interfacial polycondensation reaction on the porous support layer Floor. [0003] At present, the reverse osmosis membranes used c...

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Problems solved by technology

[0005] In view of the above-mentioned shortcomings of the prior art, the object of the present invention is to provide a reverse osmosis composite diaphragm and a preparation method, which are used to solve the problem of the lengthy process route of the reverse osmosis membrane in the prior art, low production efficiency, low support strength, and low membrane thickness. , poor interface bonding and low lifespan

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