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Preparation method of anti-pollution polyamide reverse osmosis membrane

A technology of reverse osmosis membrane and polyamide, applied in semi-permeable membrane separation, chemical instruments and methods, osmosis/dialysis water/sewage treatment, etc., can solve the problem of loss of anti-pollution performance, hydrophilic coating peeling off, and lack of bonding To achieve long-term stable anti-pollution performance, accelerate production, and ensure desalination effect

Active Publication Date: 2021-03-09
VONTRON TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current method of coating the membrane surface with a hydrophilic material to improve the anti-fouling performance of the reverse osmosis membrane is often due to the lack of stable bonding between the hydrophilic material on the membrane surface and the membrane surface, resulting in the hydrophilic coating under long-term operation. Layer peeling off, loss of anti-pollution properties
Graft coating also has the phenomenon that there are not many active sites on the surface of the membrane and the grafting is uneven.

Method used

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  • Preparation method of anti-pollution polyamide reverse osmosis membrane
  • Preparation method of anti-pollution polyamide reverse osmosis membrane
  • Preparation method of anti-pollution polyamide reverse osmosis membrane

Examples

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Embodiment 1

[0038] A method for preparing anti-contaminated polyamide reverse osmosis membrane, including the steps of:

[0039] 1) The polysulfone content is 20% of the polysulfone / nitrohydropylolidone cast film solution, completely dissolved at room temperature, depressing, and then coagulated by 20 ° C solidifying bath by 20 ° C, control the base film after the decismation is completed. The thickness is 5 mil, and it is placed in pure water after the cutting.

[0040] 2) Separating the above-mentioned base membrane in aqueous phase containing 2% amine diamine, 0.02% sodium hydroxide, and the soaking time is 1 min, and the dry film surface is blown after soaking, then soaked in a phenyl benzene containing 0.1% benzene. Among the cyclohexane of trimethyl chloride, the soaking time was 30s, and the reaction was completed, pure water rinsing was carried out, and the anti-contaminated polyamide reverse osmosis membrane was dried at 70 ° C.

Embodiment 2

[0042] A method for preparing anti-contaminated polyamide reverse osmosis membrane, including the steps of:

[0043] 1) The polysulfone / nitrohydropylolidone cast film solution is prepared, and an aniline monomer having an aniline monomer having a mold liquid mass is mixed with a nitrohydrrolidone before formulation, and then polysulfone is subjected to soaking, and Surmelt, slowly add 0.05% ammonium sulfate and 0.1% hydrochloric acid by 0.05%, completely dissolved at room temperature, and a base film is obtained by solidifying bath by 20 ° C, the control base film is 5 mils. Place the pure water after the cutting end;

[0044] 2) Separating the above-mentioned base membrane in a water phase solution containing 2% amine diamine, 0.02% sodium hydroxide, 1% DMAC, the soaking time is 1 min, and the dry film surface is blown after soaking, then soaked in Among the cyclohexane of 0.1% phenyl chloride, the soaking time is 30s, and the reaction is completed, pure water rinsing, drying a...

Embodiment 3

[0046] A method for preparing anti-contaminated polyamide reverse osmosis membrane, including the steps of:

[0047] 1) The polysulfone / nitrohydrophiltanone cast film solution is prepared, and a benzide monomer having a water mass of the cast film liquid is mixed with a nitrohydrrolidone before formulation, and then polysulfone is subjected to soaking, and then adding polysulfone, and Slowly add 0.3% hydrochloric acid from 0.15% of the cast film solution during immersion process, completely dissolved at room temperature to stand depoosure, and the base film is formed by coagulation bath points by 20 ° C, and the thickness of the base film is 5 mil. Place the pure water after the cutting end;

[0048] 2) Soak the above-mentioned base membrane in a water phase solution containing 2% amine diamine, 0.02% sodium hydroxide, 2% DMAC, and the soaking time is 1 min, and the dry film surface is blown after soaking, then soaked in it. Among the cyclohexane of 0.1% phenyl chloride, the soa...

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Abstract

The invention belongs to the technical field of reverse osmosis membrane preparation, and particularly relates to an anti-pollution polyamide reverse osmosis membrane preparation method, which comprises: 1) taking a base membrane material, placing into a membrane casting solution solvent to prepare a membrane casting solution, adding an amine monomer during the preparation process, slowly adding an initiator and an additive, standing and defoaming at room temperature after complete dissolution, and preparing a base membrane through any one of slits and blade coating after coagulating bath; and2) soaking the base membrane in a polyamine solution, drying the surface of the membrane after soaking is finished, soaking the membrane in an organic solution containing trimesoyl chloride, taking out the membrane after reaction is finished, rinsing the membrane with pure water, and drying the membrane at the drying temperature of 40-100 DEG C to obtain the anti-pollution polyamide reverse osmosis membrane. The method is simple and easy to implement, the prepared reverse osmosis membrane has long-term stable pollution resistance, meanwhile, the structure of the polyamide membrane is optimized, the membrane flux is increased, the attenuation rate of the membrane flux is reduced, and the desalination effect is guaranteed.

Description

Technical field [0001] The present invention belongs to the technical field of reverse osmosis membrane, and more particularly to the preparation method of anti-contaminated polyamide reverse osmosis membrane. Background technique [0002] Reverse osmosis techniques have been widely used in drinking pure water, food, drinks, medical pharmaceutical, municipal water trees, and industrial high-purity water, seawater, and other water treatment industries. At present, commodity reverse osmosis membranes on the market are mainly an aromatic polyamide reverse osmosis membrane prepared by interface polymerization. [0003] At present, the main problem faced by the aromatic polyamide reverse osmosis membrane is the problem of membrane pollution. The cause of contamination is in addition to the surface hydrophobic surface of the aromatic polyamide film, and the peak valley structure of the aromatic polyamide reverse osmosis membrane causes contaminants more It is easy to accumulate between...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/56B01D69/02B01D67/00C02F1/44
CPCB01D71/56B01D69/02B01D67/0002C02F1/441B01D2325/36Y02A20/131
Inventor 韩丁赵连瑞梁松苗胡利杰康燕
Owner VONTRON TECH CO LTD
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