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Compound reverse osmosis membrane with interpenetrating network desalting layer and preparation method of membrane

A technology of reverse osmosis membrane and interpenetrating network, applied in the field of nano-modified membrane materials, can solve the problem that the technology is difficult to meet the requirements, and achieve the effect of high anti-pollution ability and emphasis on control ability.

Active Publication Date: 2013-02-13
VONTRON TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for the more precise control of the performance of reverse osmosis membranes, especially the structure and properties of the desalination layer, it is difficult for the technologies used in current patents to meet the requirements.

Method used

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  • Compound reverse osmosis membrane with interpenetrating network desalting layer and preparation method of membrane
  • Compound reverse osmosis membrane with interpenetrating network desalting layer and preparation method of membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] (1) Pre-dispersion of polymer nanogel particles: Take 80g of polyvinyl alcohol nanogel (particle size 150nm, swelling degree 71.4wt%) in a fully swollen state and disperse it in 1920g of deionized water. After ultrasonic dispersion treatment for 60min, the nanogel dispersion was prepared;

[0040] (2) Preparation of solution A: Dissolve 35g of m-phenylenediamine in 965g of the polyvinyl alcohol nanogel dispersion described in step (1) to prepare a solution with a concentration of m-phenylenediamine of 3.5wt%, stir well and dissolve completely , add 5g N, N-dimethylformamide (DMF) and 0.5g appropriate amount of sodium hydroxide in turn, stir and dissolve the mixed solution to obtain A solution;

[0041] (3) Prepare B solution: Dissolve 2.1g of trimesoyl chloride in 997.9g of cyclohexane to prepare a solution with a concentration of 0.21wt%, and obtain B solution after complete dissolution;

[0042] (4) Soak the polysulfone porous support layer in solution A for 30s, tak...

Embodiment 2

[0046] (1) Pre-dispersion of polymer nanogel particles: Take 80g of polyvinyl alcohol nanogel in a fully swollen state (particle size ~ 550nm, swelling degree 80wt%) and disperse it in 1920g of deionized water. After ultrasonic dispersion treatment for 60min, the nanogel dispersion was prepared;

[0047] (2) Preparation of solution A: Dissolve 35g of m-phenylenediamine in 965g of the polyvinyl alcohol nanogel dispersion described in step (1) to prepare a solution with a concentration of m-phenylenediamine of 3.5wt%, stir well and dissolve completely , add 5g N, N-dimethylformamide (DMF) and 0.5g sodium hydroxide in sequence, stir and dissolve the mixed solution to obtain A solution;

[0048] (3) Prepare B solution: Dissolve 2.1g of trimesoyl chloride in 997.9g of cyclohexane to prepare a solution with a concentration of 0.21wt%, and obtain B solution after complete dissolution;

[0049] (4) Soak the polysulfone porous support layer in solution A for 1 second, take it out and ...

Embodiment 3

[0053] (1) Pre-dispersion of polymer nanogel particles: take 80g of polyvinyl alcohol nanogel (particle size ~ 200nm, swelling degree 86wt%) in a fully swollen state and disperse them in 1920g of deionized water, stir them evenly and use ultrasonic waves After ultrasonic dispersion treatment for 60min, the nanogel dispersion was prepared;

[0054] (2) Preparation of solution A: Dissolve 35g of m-phenylenediamine in 965g of the polyvinyl alcohol nanogel dispersion described in step (1) to prepare a solution with a concentration of m-phenylenediamine of 3.5wt%, stir well and dissolve completely , add 5g N, N-dimethylformamide (DMF) and 0.5g sodium hydroxide in sequence, stir and dissolve the mixed solution to obtain A solution;

[0055] (3) Prepare B solution: Dissolve 2.1g of trimesoyl chloride in 997.9g of cyclohexane to prepare a solution with a concentration of 0.21wt%, and obtain B solution after complete dissolution;

[0056] (4) Soak the polysulfone porous support layer ...

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Abstract

The invention discloses a compound reverse osmosis membrane with interpenetrating network desalting layer and a preparation method of the membrane. The desalting layer consists of a stereoscopic network which is formed by interpenetrating macromolecule nanogel and polyamide. The preparation method comprises the following steps of: pre-adding hydrophilic and / or oleophylic macromolecule nanogel with good dispersion into a solvent of solution A and / or B, preparing a water phase A solution containing m-phenylenediamine and / or p-phenylenediamine, preparing an organic phase B solution containing trimesoyl chloride, enabling the solution A and the solution B to fully contact on a porous support carrier for interface reaction, rinsing by using deionized water, carrying out moisturizing treatment by using glycerol, and drying. The compound reverse osmosis membrane disclosed by the invention has a sodium chloride removal rate of not less than 99% and a flux of not less than 25GFD (Geophysical Fluid Dynamics) under a pressure of 225psi; the microstructure and the charge property of the desalting layer can be regulated and controlled through the macromolecule nanogel so that the reverse osmosis membrane with high anti-pollution capability is prepared; and the compound reverse osmosis membrane can further be used for developing novel low-pollution reverse osmosis membranes.

Description

technical field [0001] The invention relates to a composite reverse osmosis membrane with an interpenetrating network desalination layer and a preparation method thereof, belonging to the technical field of nano-modified membrane materials. Background technique [0002] Against the background of global water scarcity and the historical background of long-term dependence on imports of RO membranes, the domestic reverse osmosis membrane industry is very important to the sustainable development of the national economy and the enhancement of comprehensive international competitiveness. The technical performance of domestic membranes has gradually matured after years of exploration and accumulation, so it is urgent to develop more high-quality reverse osmosis membrane varieties. The technical indicators of the RO membrane are divided into the technical indicators of the diaphragm and the technical indicators of the membrane element. The former has a strong explanatory significanc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/56B01D69/12B01D67/00
Inventor 梁松苗吴宗策金焱蔡志奇
Owner VONTRON TECH CO LTD
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