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High-flux reverse osmosis composite membrane and preparation method thereof

A reverse osmosis composite membrane, high-flux technology, applied in the field of high-flux reverse osmosis composite membrane and its preparation, can solve the complex, polyamide membrane material cross-linking degree and microporous characteristics controllable adjustment is difficult, not clear. Membrane process and other problems, to achieve the effect of simple preparation process, broad industrial application prospects, and improved water flux

Pending Publication Date: 2022-01-07
青岛致用新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the fast reaction rate between monomers in interfacial polymerization, the nanoscale reaction area, and the complex and unclear film formation process, it is still difficult to control the degree of crosslinking and microporous properties of polyamide membrane materials.

Method used

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  • High-flux reverse osmosis composite membrane and preparation method thereof
  • High-flux reverse osmosis composite membrane and preparation method thereof
  • High-flux reverse osmosis composite membrane and preparation method thereof

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Embodiment 1

[0053] This embodiment 1 provides a method for preparing a high-flux reverse osmosis composite membrane, comprising the following steps:

[0054] (1) Dissolve m-phenylenediamine and 2-methylimidazole in water to obtain an aqueous phase solution, wherein the mass concentration of m-phenylenediamine is 2%, and the mass concentration of 2-methylimidazole is 0.5%, 1%, 2% respectively %, 3%, 4%, 5%;

[0055] (2) Soak the polysulfone ultrafiltration membrane in the aqueous phase solution prepared in step (1) respectively, soak for 5 minutes, take it out, and dry the residual aqueous solution on the surface of the membrane by an air knife;

[0056] (3) dissolving trimesoyl chloride in n-hexane to obtain an oil phase solution of trimesoyl chloride with a mass fraction of 0.1%;

[0057] (4) Slowly pour the oil phase solution obtained in step (3) onto the upper surface of the membrane obtained in step (2) respectively, initiate interfacial polymerization, and continue for 60s to form a...

Embodiment 2

[0067] This embodiment 2 provides a method for preparing a high-flux reverse osmosis composite membrane, comprising the following steps:

[0068] (1) dissolving m-phenylenediamine and imidazole in water to obtain an aqueous phase solution, wherein the mass concentration of m-phenylenediamine is 2%, and the mass concentration of imidazole is 1.5%;

[0069] (2) Immerse the polyethersulfone ultrafiltration membrane in the aqueous phase solution prepared in step (1), take it out after soaking for 5 minutes, and dry the residual aqueous solution on the surface of the membrane through an air knife;

[0070] (3) dissolving trimesoyl chloride in cyclohexane to obtain an oil phase solution of trimesoyl chloride with a mass fraction of 0.15%;

[0071] (4) Slowly pour the oil phase solution obtained in step (3) onto the upper surface of the membrane obtained in step (1), initiate interfacial polymerization, continue for 30s to form a cross-linked polyamide separation layer, and remove th...

Embodiment 3

[0075] This embodiment 3 provides a method for preparing a high-flux reverse osmosis composite membrane, comprising the following steps:

[0076] (1) dissolving m-phenylenediamine and 3-methylimidazole in water to obtain an aqueous phase solution, wherein the mass concentration of m-phenylenediamine is 5%, and the mass concentration of imidazole is 2.5%;

[0077] (2) Soak the polysulfone ultrafiltration membrane in the aqueous phase solution prepared in step (1), take it out after soaking for 1 min, and dry the residual aqueous solution on the surface of the membrane by rollers;

[0078] (3) Dissolving trimesoyl chloride in cyclohexane to obtain an oil phase solution with a mass fraction of 2.0%;

[0079] (4) Slowly pour the oil phase solution obtained in step (3) onto the upper surface of the film obtained in step (1), initiate interfacial polymerization, continue for 10s to form a cross-linked polyamide separation layer, and remove the residual trimesoyl chloride The oil ph...

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Abstract

The invention discloses a preparation method of a high-flux reverse osmosis composite membrane. The method comprises the following steps: taking m-phenylenediamine, imidazole and a derivative thereof as an aqueous phase solution for interfacial polymerization, limiting an imidazole additive to be an imidazole compound containing a secondary amine group, the preparation method comprises the following steps: carrying out interfacial polymerization reaction on m-phenylenediamine, an imidazole additive and trimesoyl chloride on a porous base membrane to form a polyamide separation layer, carrying out heat treatment on the obtained porous base membrane with the polyamide separation layer at 50-80 DEG C for 2-30 minutes, and then soaking in deionized water to obtain the high-flux reverse osmosis composite membrane. According to the invention, a secondary amine functional group in the imidazole ring of the imidazole additive can react with acyl chloride to form imidazole amide, so that in the interfacial polymerization process, the imidazole additive and m-phenylenediamine can compete to consume a part of acyl chloride groups, the molecular-scale competitive reaction can uniformly reduce the crosslinking degree of the polyamide material, and the formed reverse osmosis composite membrane has significantly improved water flux.

Description

technical field [0001] The invention relates to the technical field of reverse osmosis membrane preparation, in particular to a high-flux reverse osmosis composite membrane and a preparation method thereof. Background technique [0002] Reverse osmosis is considered to be a key technology to solve the problems of water pollution and clean water resource shortage. It has been widely used in advanced water treatment fields such as "zero discharge" and "recycling" of industrial wastewater, seawater / brackish water desalination, etc. An important guarantee for the harmonious development of man and nature. The core of reverse osmosis technology lies in the reverse osmosis membrane. At present, the reverse osmosis membrane on the market is mainly a composite membrane structure, which consists of an upper dense separation layer and a lower porous support layer. The separation performance of the membrane is mainly determined by the upper separation layer. The separation layer of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/64B01D67/00B01D69/10B01D69/12C02F1/44C02F103/08
CPCB01D71/64B01D69/10B01D67/0006B01D69/125C02F1/441C02F2103/08
Inventor 蒋驰侯影飞马修鹏费兆辉
Owner 青岛致用新材料科技有限公司
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