Anti-pollution reverse osmosis membrane and preparation method thereof

Abstract

The invention relates to an anti-pollution reverse osmosis membrane which is prepared by coating a polysulfone base membrane with a water phase reaction monomer solution and an oil phase reaction monomer solution in sequence to generate an interfacial polymerization reaction so as to generate a desalination layer with a flat structure, and the water phase reaction monomer solution comprises the following components in percentage by weight: 1-5% of a water phase reaction monomer, 0.1-8% of a catalyst, 0-0.2% of a surfactant, 0-10% of a regulator and the balance of water. And the balance of water. The oil-phase reaction monomer solution is prepared from the following components in percentage by weight: 0.1 to 1 percent of oil-phase reaction monomer, 0 to 5 percent of small molecule additive and the balance of oil-phase solvent. The invention also relates to a preparation method of the anti-pollution reverse osmosis membrane. The preparation method comprises the following steps: 1) preparing a water-phase reaction monomer solution; 2) preparing an oil-phase reaction monomer solution; 3) successively coating the surface of the polysulfone-based membrane with a water-phase reaction monomer solution and an oil-phase reaction monomer solution; and 4) evaporating the semi-finished product obtained in the step 3) in an environment of 30-100 DEG C. The membrane provided by the invention has a flat-structure desalination layer, the microstructure is smoother and not easy to pollute, the attenuation is reduced, the membrane is easy to clean, and the recovery rate of water yield after cleaning is obviously improved.

Description

technical field [0001] The invention relates to the technical field of reverse osmosis membranes, in particular to an anti-pollution reverse osmosis membrane and a preparation method thereof. Background technique [0002] The reverse osmosis membrane is a nearly non-porous semi-permeable membrane that can separate almost everything in the water and only allow water molecules to pass through. Therefore, reverse osmosis membranes are widely used in water purification, and reverse osmosis technology has become an indispensable core technology in water treatment technology. [0003] The process of removing solutes in water by reverse osmosis membrane is a filtration separation process, usually cross-flow filtration. Such as figure 1 As shown, the raw water (water to be treated) flows parallel to the membrane surface under the promotion of the driving force parallel to the membrane surface 100, and under the pressure perpendicular to the membrane surface 100, part of the water ...

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Problems solved by technology

However, these methods also need to reprocess the prepared reverse osmosis membrane, and the operation is relatively cumbersome.

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