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Reverse osmosis membrane and preparation method thereof

A technology of reverse osmosis membrane and hydrophilic membrane, applied in the field of reverse osmosis membrane and its preparation, can solve problems affecting the uniformity of polyamine aqueous solution, affecting the final performance of reverse osmosis, affecting the desalination rate and uniformity of polyamide, and achieving good Salt rejection rate and uniformity, long service life, and effect of increasing binding force

Active Publication Date: 2015-08-19
BEIJING ORIGIN WATER FILM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the strong hydrophobicity of the polysulfone-based membrane, it will affect the uniformity of the adsorption of the polyamine aqueous solution on the membrane surface, thereby affecting the desalination rate and uniformity of the final polyamide; due to the strong hydrophilicity of the polyamide desalination layer , how to improve the bonding strength between the polysulfone-based membrane and the polyamide desalination layer is an important issue that affects the final performance of reverse osmosis

Method used

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preparation example Construction

[0028] Specifically, the method for preparing a reverse osmosis membrane according to an embodiment of the present invention includes the following steps:

[0029] a) Immerse the polysulfone-based membrane in a polyvinyl alcohol solution having a first predetermined concentration, remove excess solution on the surface of the polysulfone-based membrane after taking it out, and place the polysulfone-based membrane in air for 1-120 minutes.

[0030] b) immersing the polysulfone base membrane obtained in step a) in a cross-linking agent solution having a second predetermined concentration for 0.5-10 minutes.

[0031] c) The polysulfone-based membrane obtained in step b) is taken out and dried to obtain a polysulfone-based membrane with a polyvinyl alcohol cross-linked membrane formed on the surface.

[0032] d) Immerse the polysulfone-based membrane with the polyvinyl alcohol cross-linked membrane formed on the surface in the polyamine aqueous solution having a third predetermined...

Embodiment 1

[0042] The reverse osmosis membrane was prepared as follows.

[0043] 1) Immerse the polysulfone-based membrane in a solution of 0.5%wt polyvinyl alcohol, take it out, remove the excess surface of the polysulfone-based membrane with a rubber roller, and then dry the polysulfone-based membrane in the air for 5 minutes.

[0044] 2) Soak the polysulfone-based membrane obtained in step 1) in the cross-linking agent solution for 10 minutes. The crosslinking agent is glutaraldehyde, the concentration is 0.5%wt, and the catalyst is phosphoric acid, the concentration is 0.5%wt.

[0045] 3) Take out the polysulfone-based membrane obtained in step 2), and heat-treat it in an oven at 60° C. for 6 minutes. At this time, a polyvinyl alcohol cross-linked membrane has been formed on the surface of the polysulfone-based membrane.

[0046] 4) Immerse the film obtained in step 3) into the aqueous polyamine solution, the polyamine is 2%wt m-phenylenediamine + 1%wt o-phenylenediamine, soak for 1...

Embodiment 2

[0051] Prepare the reverse osmosis membrane as follows

[0052] 1) Immerse the polysulfone-based membrane in a solution of 0.6%wt polyvinyl alcohol, take it out, remove the excess surface of the polysulfone-based membrane with a rubber roller, and then dry the polysulfone-based membrane in the air for 5 minutes.

[0053] 2) Soak the polysulfone-based membrane obtained in step 1) in the cross-linking agent solution for 10 minutes. The crosslinking agent is glutaraldehyde, the concentration is 0.5%wt, and the catalyst is phosphoric acid, the concentration is 0.5%wt.

[0054] 3) Take out the polysulfone-based membrane obtained in step 2), and heat-treat it in an oven at 50° C. for 8 minutes. At this time, a polyvinyl alcohol cross-linked membrane has been formed on the surface of the polysulfone-based membrane.

[0055] 4) Immerse the film obtained in step 3) into the aqueous polyamine solution, the polyamine is 3%wt m-phenylenediamine + 1%wt o-phenylenediamine, soak for 15s, re...

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Abstract

The invention discloses a reverse osmosis membrane and a preparation method thereof. The reverse osmosis membrane comprises a non-woven support layer, a polysulfone base membrane layer, a polyamide desalination layer and a transition layer, wherein the non-woven support layer is coated with the polysulfone base membrane layer; the transition layer is a hydrophilic membrane layer and is arranged between the polysulfone base membrane layer and the polyamide desalination layer. According to the reverse osmosis membrane, as the hydrophilic transition layer is inserted between the polysulfone base membrane layer and the polyamide desalination layer, the hydrophilic transition layer improves dispersion uniformity of a polyamine solution on the surface of the polysulfone base membrane layer, a binding force of the hydrophilic polyamide desalination layer with the polysulfone base membrane layer is increased greatly, the reverse osmosis membrane is high in desalinization ratio, uniformity and water flux, and long in service life, and can bear at least 0.5 MPa backpressure, and significantly lower engineering cost and manufacturing cost.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a reverse osmosis membrane and a preparation method thereof. Background technique [0002] Reverse osmosis is an efficient water purification method, which has the advantages of high efficiency, low cost, no phase change, easy integration, modularization and automation, etc. It is widely used in the preparation of high-purity water in the electronics industry, medical water preparation, seawater desalination, Water desalination, sewage recycling and many other fields. With the shortage of global fresh water resources and the increasingly serious water pollution, reverse osmosis technology is playing an increasingly important role in water purification. [0003] The existing reverse osmosis membranes are usually prepared by interfacial polymerization during the preparation process. The main preparation process is: coating the polysulfone base film on the non-woven suppor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/68B01D69/10B01D67/00C02F1/44
CPCY02A20/131
Inventor 文剑平林勇陈亦力吴强
Owner BEIJING ORIGIN WATER FILM TECH
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