Production method of anti-pollution nanofiltration membrane used for water purifying machines

Abstract

The invention relates to a production method of an anti-pollution nanofiltration membrane used for water purifying machines. The method comprises the following steps: 1, producing a supporting layer from tubular steel wire meshes; 2, covering the surface of the produced supporting layer with a porous carrier layer; 3, covering the surface of the porous carrier with a nanofiltration membrane layer; and 4, coating the external surface of the nanofiltration membrane layer with a protection layer, reacting the protection layer with the nanofiltration membrane layer through using a PVA-water solution with the concentration of 11-15%, and drying the obtained layers in a vacuum drying box to produce the anti-pollution nanofiltration membrane used for water purifying machines. The production method of the anti-pollution nanofiltration membrane used for water purifying machines allows the nanofiltration membrane to be produced by compounding the supporting layer, the porous carrier layer, the nanofiltration membrane layer and the protection layer, so the method guarantees the nanofiltration efficiency, enhances the structure strength of the nanofiltration layer, prolongs the service life of the nanofiltration layer, prolongs the service time, and reduces the cost.

Description

technical field [0001] The invention relates to a preparation method of an anti-pollution nanofiltration membrane for a water purifier, belonging to the technical field of filtration equipment. Background technique [0002] Nanofiltration membrane: The pore size is more than 1nm, generally 1-2nm, which is a functional semi-permeable membrane that allows solvent molecules or some low molecular weight solutes or low-priced ions to pass through. It is a special and promising type of separation membrane. It is named for the size of the intercepted substance is about nanometers. The molecular weight of the intercepted organic matter is about 150-500, and the ability to intercept soluble salts is 2- Between 98%, the desalination of monovalent anion salt solution is lower than that of hypervalent anion salt solution. It is used to remove organic matter and color of surface water, remove hardness of ground water, partially remove soluble salt, concentrate fruit juice and separate u...

AI Technical Summary

Problems solved by technology

Among them, the hollow fiber and roll-type membrane modules have high filling density, low cost, and good hydrodynamic conditions in the module; however, these two membrane modules require high manufacturing technology, difficult sealing, poor anti-pollution ability during use, and poor pre-treatment of feed liquid. high processing requirements

Although the plate-frame and tubular membrane modules are easy to clean and resistant to pollution, the packing density of the membrane is low and the cost is high.