High-throughput polyamide reverse osmosis composite membrane
A reverse osmosis composite membrane and polyamide technology, applied in reverse osmosis, semi-permeable membrane separation, osmosis/dialysis water/sewage treatment, etc. The effect of high water content and simple preparation method
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Example Embodiment
[0041] Examples 1-8
[0042] Dissolved in N,N-dimethylformamide with 13.5wt% Udel PS3500 polysulfone, 0.2wt% water and 0.1wt% nonylphenol polyoxyethyl ester phosphate, applied to polyester nonwoven , and then immersed in water to remove the solvent to obtain a porous support membrane with a molecular weight cut-off of 100,000-120,000, which is stored in a wet state for later use.
[0043] The wet polysulfone porous support membrane is immersed on one side into an aromatic polyamine (m-phenylenediamine, or 4-chloro-m-phenylenediamine, or 4-nitro-m-phenylenediamine, or 2,4-diphenylene diamine, respectively). Aminotoluene) and aliphatic macromolecular polyamine polyvinylamine (molecular weight = 30,000; degree of aminolysis a = 0.52) in an aqueous solution with a total content of 2.0 wt% for 4 minutes, use a rubber roller to roll the support film surface, and drain the aqueous solution After drying the surface of the support film with nitrogen, it is unilaterally contacted with a 0
Example Embodiment
[0046] Examples 9-14
[0047] As in the previous example, according to the above method, an aqueous solution with a total content of m-phenylenediamine and polyvinylamine (molecular weight = 30,000; degree of aminolysis a = 0.52) with a total content of 2.4 wt %, and 0.05 wt % of an aromatic polybasic acid chloride ( The n-heptane solution of trimesoyl chloride (TMC), or 5-isocyanate-isophthaloyl chloride (ICIC), or 5-oxocarbonyl chloride-isophthaloyl chloride (CFIC) was used to prepare reverse osmosis composite membrane. These examples are to investigate the effect of adding aliphatic macromolecular polyamine polyvinylamine on the film-forming properties of different polybasic acid chlorides.
[0048]
[0049] The above example shows that: adding aliphatic macromolecular polyamine polyvinylamine to the aqueous phase solution of aromatic polyamine can significantly improve the reverse osmosis composite formed by different polybasic acid chlorides on the premise of keeping the
Example Embodiment
[0050] Examples 15-21
[0051] As in the previous example, according to the above method, the total content of m-phenylenediamine and polyvinylamine (molecular weight = 30,000; degree of aminolysis a = 0.52) is 1.2 wt%, and different weight ratios of m-phenylenediamine and polyvinylamine are used. Aqueous solution, and 0.12wt% trimesoyl chloride (TMC) in n-heptane to prepare reverse osmosis composite membrane. These examples are to investigate the influence of the weight ratio of aromatic polyamines and aliphatic macromolecular polyamines in the aqueous solution on the film-forming properties.
[0052] Example
[0053] The above example shows that high-flux reverse osmosis composite membrane can be obtained by adding aliphatic macromolecular polyamine polyvinylamine to the aqueous phase solution of aromatic polyamine, but the excessive content of polyvinylamine will lead to the decrease of membrane desalination rate.
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