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Preparation method of reverse osmosis membrane with ultrathin asymmetric polyamide interception layer

A technology of polyamide layer and reverse osmosis membrane, applied in the direction of reverse osmosis, semi-permeable membrane separation, chemical instruments and methods, etc., can solve problems such as decline, and achieve the effect of simple preparation process, easy control of conditions, and small amount of raw materials used

Inactive Publication Date: 2020-05-29
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, "Science" (volume 356, period 6343, 10-18, 2017) proposed that when the polyamide separation layer is reduced to a certain thickness (about less than 100 nanometers), by reducing the thickness of the polyamide separation layer, the water Flux effect, significantly decreased

Method used

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  • Preparation method of reverse osmosis membrane with ultrathin asymmetric polyamide interception layer
  • Preparation method of reverse osmosis membrane with ultrathin asymmetric polyamide interception layer
  • Preparation method of reverse osmosis membrane with ultrathin asymmetric polyamide interception layer

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Experimental program
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Effect test

Embodiment 1

[0034] The water phase containing PIP at a concentration of 0.05% was used to cover the membrane surface of the porous polysulfone-bottomed membrane. Place it horizontally for 2 minutes to fully infiltrate the surface of the polysulfone membrane with the PIP aqueous solution. The surface of the polysulfone-based membrane was then purged with nitrogen to remove excess PIP aqueous phase. Afterwards, place on the basement membrane horizontally, slowly pour n-hexane containing 0.01%wt TMC at a concentration, and wait for it to spread naturally on the basement membrane and completely cover the basement membrane. Start timing, and the interfacial polymerization reaction time is 1 min. Tilt the basement membrane so that the n-hexane liquid containing TMC flows away and leaves the surface of the membrane. This moment is regarded as the end point of the interfacial polymerization reaction, the stop moment. A bottom separating layer of polyamide was built up. Afterwards, place the m...

Embodiment 2

[0036] As in the process steps of embodiment 1, wherein only the concentration of MPD and TMC two reactive monomers in the secondary interfacial polymerization is changed. Wherein the concentration of MPD is 0.1%wt, and the concentration of TMC is 0.02%wt.

Embodiment 3

[0038] As in the process steps of embodiment 1, wherein only the concentration of MPD and TMC two reactive monomers in the secondary interfacial polymerization is changed. Wherein the concentration of MPD is 0.2%wt, the concentration of TMC is 0.04%wt

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Abstract

The invention discloses a preparation method of a reverse osmosis membrane with an ultrathin asymmetric polyamide interception layer. The reverse osmosis membrane is composed of a porous bottom membrane and an ultrathin asymmetric polyamide interception layer. The ultra-thin asymmetric polyamide interception layer is of a double-layer structure, the bottom-layer structure is a PIP-TMC polyamide layer, the top-layer structure is an MPD-TMC polyamide layer, and the total thickness of the ultra-thin asymmetric polyamide interception layer is 100nm or below. The preparation method comprises the following steps: (1) preparing a PIP-TMC polyamide layer on a porous bottom membrane by utilizing interfacial polymerization reaction; and (2) preparing an MPD-TMC polyamide layer on the PIP-TMC polyamide layer obtained in the step (1) by utilizing interfacial polymerization reaction. The method is simple and safe in preparation process, easy in condition control and low in cost, the water flux of the prepared ultrathin reverse osmosis membrane with the ultrathin asymmetric polyamide interception layer is greatly improved, and the interception performance of the ultrathin reverse osmosis membrane is improved to a certain extent.

Description

technical field [0001] The invention relates to a method for preparing a reverse osmosis membrane with an ultrathin, asymmetric polyamide intercepting layer. Background technique [0002] Water resources are an indispensable natural resource for human survival and development. However, the proportion of fresh water resources available for human use on the earth is less than 1%. Therefore, how to solve the shortage of water resources has become an urgent problem for human survival and development. Membrane separation technology is widely used in brackish water desalination, sewage treatment and seawater desalination due to its advantages of high efficiency, environmental protection and low cost. [0003] The core of membrane separation technology is the separation membrane, and the design of the membrane material directly determines the performance of the membrane separation. Polyamide is a membrane separation material with excellent performance and has been widely used in t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/02B01D71/56B01D67/00C02F1/44
CPCB01D61/025B01D67/0006B01D71/56C02F1/441
Inventor 宋潇潇甘博文周勇高从堦
Owner ZHEJIANG UNIV OF TECH
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