Novel high-flux positively charged nanofiltration membrane and preparation method thereof
A positively charged, high-flux technology, applied in the field of membrane separation, can solve the problems of positively charged nanofiltration membrane preparation time and low water flux, and achieve the effects of low preparation cost, stable performance, and increased porosity
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[0051] The novel high-flux positively charged nanofiltration membrane of the present invention is obtained by a novel high-flux positively charged nanofiltration membrane preparation method, the preparation method comprising the following steps:
[0052] S1: Prepare the aqueous phase solution: add surfactant and proton acceptor to the aqueous solution containing the hydrophilic group polyamine monomer, mix well; the hydrophilic group polyamine monomer is 2,4-diamino -6-phenyl-1,3,5-triazine, 1,3-bis(aminomethyl)cyclohexane, tris(hydroxymethyl)aminomethane, N-aminophthalimide and 2, At least one of 4-dimethoxybenzylamine; the mass concentration of the hydrophilic polyamine monomer in the aqueous phase solution is 0.5%-5%; the mass concentration of the proton accepting agent in the aqueous phase solution is 1 %-5%; the mass concentration of the surfactant in the aqueous phase solution is 0.1%-5%; preferably 0.1%-3%;
[0053] S2: Immerse the porous support layer in the water pha...
Embodiment 1
[0061] A novel high-flux positively charged nanofiltration membrane preparation method:
[0062] S1: Configure the aqueous phase solution: add trisodium phosphate and sodium lauryl sulfate to the aqueous solution of N-aminophthalimide, and mix well; N-aminophthalimide in the aqueous phase solution The mass concentration of trisodium phosphate is 0.5%, the mass concentration of trisodium phosphate is 3%, and the mass concentration of sodium lauryl sulfate is 3%;
[0063] S2: Immerse the porous support ultrafiltration bottom membrane in the water phase solution of S1 for 60s, remove the excess water phase solution on the surface of the porous support ultrafiltration bottom membrane with a roller; then immerse the porous support layer in the oil phase solution containing acid chloride monomer for 20s Interface reaction, take out and drain the excess oil phase solution on the surface of the membrane, continue to heat treatment at a temperature of 90 °C for 4 minutes, and spray a v...
Embodiment 2
[0065] A novel high-flux positively charged nanofiltration membrane preparation method:
[0066] The mass concentration of sodium lauryl sulfate in step S1 is 0.1%;
[0067] All the other steps are the same as in Example 1.
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