Preparation method of reverse osmosis membrane

Abstract

The invention provides a preparation method of a reverse osmosis membrane, which comprises the following steps: preparing a 0.1-10 wt% polyfunctional aromatic amine solution, and stirring uniformly to obtain a water phase solution; preparing a 0.01-10 wt% polyfunctional acyl chloride organic phase solution to obtain an oil phase solution; fixing an ultrafiltration membrane with a support layer to a rotary bearing, and starting the rotating shaft to drive the ultrafiltration membrane to move; sequentially spraying the water phase solution and oil phase solution onto the ultrafiltration membrane surface by a film coating device, and waiting until the organic solvents on the membrane surface are completely volatilized; and sending the dry film of which the organic solvents are completely volatilized into an 80-100 DEG C blast drying oven, and drying until the organic phase solvents are volatilized, thereby obtaining the reverse osmosis membrane. The preparation method obviously lowers the recovery cost of waste liquor on the premise of stabilizing the membrane properties.

Description

technical field [0001] The invention relates to reverse osmosis membrane technology, in particular to a preparation method of a reverse osmosis membrane. Background technique [0002] The reverse osmosis membrane is generally prepared by interfacial polymerization through the immersion method of aqueous phase solution and organic phase solution, that is, the ultrafiltration base membrane is immersed in the aqueous phase solution and organic phase solution tank on the stainless steel drum as the drum rotates. This method is mainly to control the concentration and amount of two-phase monomers carried on the membrane by utilizing the additional ability of the ultrafiltration base membrane to aqueous solution and organic solvent. Therefore, the aqueous phase and organic phase solution are far in excess for the interfacial polymerization reaction on the ultrafiltration membrane. During the production and preparation process, waste liquid of aqueous solution and organic solution w...

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Problems solved by technology

[0002] The reverse osmosis membrane is generally prepared by interfacial polymerization through the immersion method of aqueous phase solution and organic phase solution, that is, the ultrafiltration base membrane is immersed in the aqueous phase solution and organic phase solution tank on the stainless steel drum as the drum rotates. This method is mainly to control the concentration and amount of two-phase monomers carried on the membrane by utilizing the additional ability of the ultrafiltration base membrane to aqueous solution and organic solvent. Therefore, the aqueous phase and organic phase solution are far in excess for the interfacial polymerization reaction on the ultrafiltration membrane. During the production and preparation process, waste liquid of aqueous solution and organic solution will be generated, as well as some impurities and by-products will be continuously generated, resulting in recovery costs. High and possible environmental pollution, and the aqueous phase solution may enter the back of the ultrafiltration membrane, resulting in differences in the amount of water on the surface of the membrane, resulting in differences in the performance of the interfacial polymerization reaction membrane

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