Reverse osmosis membrane and its preparation method and application
A technology of reverse osmosis membrane and membrane casting solution, which is applied in the field of separation membrane and can solve problems such as poor chlorine resistance
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[0030] The present invention also provides a method for preparing a reverse osmosis membrane, the method comprising: in the presence of a photoinitiator, crossing sulfonated polyethersulfone having a structure shown in formula (I) and a structure shown in formula (II) Combined to form a separation layer;
[0031]
[0032] Among them, R 1 -R 4 Each is independently H or C1-C4 alkyl, and R 1 -R 4 Not H at the same time; R 5 -R 8 Each independently is H or -SO 3 M, and R 5 -R 8 Not H at the same time, M is an alkali metal.
[0033] In the present invention, the above-mentioned sulfonated polyethersulfone is not particularly limited, and various sulfonated polyethersulfones used in the separation layer of reverse osmosis membranes in the field can be used.
[0034] According to a preferred embodiment of the present invention, R 1 -R 4 each independently is H or methyl, and R 1 -R 4 not simultaneously H; preferably, R 1 -R 4 Both are methyl.
[0035] According to a...
Embodiment 1
[0067] 1.0 g of dried sulfonated polyethersulfone (ion exchange capacity: 1.98 mmol / g) and 0.2 g of benzophenone were dissolved in a mixed solvent composed of 100 g of formic acid, ethylene glycol monomethyl ether and deionized water. The bisphenol A polysulfone support layer was fixed on a glass plate, and the prepared coating solution was evenly brushed on the surface of the support layer, and then heat-treated at 70°C for 10 minutes to obtain an initial composite reverse osmosis membrane. Then put the initial membrane into a UV box with a wavelength of 254nm for 5 minutes and take it out to obtain a cross-linked sulfonated polyethersulfone composite reverse osmosis membrane (N1) with a separation layer thickness of 185nm.
Embodiment 2
[0069] 0.75 g of dried sulfonated polyethersulfone (ion exchange capacity: 1.16 mmol / g) and 0.0075 g of benzophenone were dissolved in a mixed solvent composed of 100 g of formic acid, ethylene glycol monomethyl ether and deionized water. The bisphenol A polysulfone support layer was fixed on a glass plate, and the prepared dilute coating solution was evenly brushed on the surface of the support layer, and then heat-treated at 50°C for 15 minutes to obtain an initial composite reverse osmosis membrane. Then put the initial membrane into a UV box with a wavelength of 254nm for 5 minutes and take it out to obtain a cross-linked sulfonated polyethersulfone composite reverse osmosis membrane (N2) with a separation layer thickness of 155nm.
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