Polyamide reverse osmosis composite membrane and preparation method thereof

A reverse osmosis composite membrane and polyamide technology, applied in reverse osmosis, semi-permeable membrane separation, chemical instruments and methods, etc., can solve the problems of membrane water flux decline, achieve low surface tension, increase the degree of polymerization, and improve The effect of salt rejection

Inactive Publication Date: 2018-01-23
宁波日新恒力科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the difficulty of diffusion of water-phase monomers to the oil-phase reaction zone is reduced, and more water-phase monomers will diffuse to the oil-phase reaction zone, and the degree of polyamide interfacial polymerization reaction increases, making the polyamide active layer denser. Therefore, while improving the desalination rate of the reverse osmosis composite membrane, the water flux of the membrane will be reduced.

Method used

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Effect test

preparation example Construction

[0021] In the preparation process of polyamide reverse osmosis composite membrane, adding surfactant to the water phase can not only make the water phase solution contact with the polysulfone-based membrane more fully, but also prepare a more complete polyamide active layer, but in The increase in salt rejection results in a decrease in water flux. To address this defect, the present invention uses polyether-modified polydimethylsiloxane as a surfactant and adds it to the aqueous phase solution prepared by the polyamide reverse osmosis composite membrane. The prepared reverse osmosis composite membrane not only improves the desalination rate, but also Water flux has little effect.

[0022] Herein, a range indicated by "one value to another value" is a general representation which avoids enumerating all values ​​in the range in the specification. Therefore, the description of a specific numerical range covers any numerical value in the numerical range and the smaller numerical...

Embodiment 1

[0032] Prepare an aqueous m-phenylenediamine solution with a mass fraction of 6%, 0.05 wt% sodium hydroxide, and 0.01 wt% polyether-modified polydimethylsiloxane, and stir for 5 minutes. Prepare a trimesoyl chloride n-hexane solution with a mass fraction of 0.3%, and stir for 10 min. Immerse the polysulfone support membrane in the above m-phenylenediamine aqueous solution for 25s, remove the solvent after taking it out, and then immerse it in the above trimesoyl chloride n-hexane solution for interfacial polymerization reaction, the interfacial polymerization reaction time is 50s. After the reaction is completed, it is treated in an oven and hot water, moisturized by glycerin, and then dried to obtain a polyamide reverse osmosis composite membrane. The water flux and desalination rate of the membrane are measured.

Embodiment 2

[0034] Prepare an aqueous m-phenylenediamine solution with a mass fraction of 6%, 0.05wt% sodium hydroxide, and 0.04wt% polyether-modified polydimethylsiloxane, and stir for 5 minutes. Prepare a trimesoyl chloride n-hexane solution with a mass fraction of 0.3%, and stir for 10 min. Immerse the polysulfone support membrane in the above m-phenylenediamine aqueous solution for 25s, remove the solvent after taking it out, and then immerse it in the above trimesoyl chloride n-hexane solution for interfacial polymerization reaction, the interfacial polymerization reaction time is 50s. After the reaction is completed, it is treated in an oven and hot water, moisturized by glycerin, and then dried to obtain a polyamide reverse osmosis composite membrane. The water flux and desalination rate of the membrane are measured.

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Abstract

The invention discloses a preparation method of a polyamide reverse osmosis composite membrane. The preparation method includes providing of polyamine water-phase solution and performing of interfacial polymerization reaction, wherein polyether modified polydimethylsiloxane in concentration of 0.01wt%-2wt% is dissolved in the polyamine water-phase solution. The invention further provides the polyamide reverse osmosis composite membrane prepared according to the preparation method. In the preparation method, polyether modified polydimethylsiloxane serving as a surfactant is applied to preparation of the reverse osmosis composite membrane, has unique advantages as the surfactant due to low surface tension and long flexible side chains and enables increasing of the salt removing rate of the polyamide reverse osmosis composite membrane with low water flux influences.

Description

technical field [0001] The invention relates to the technical field of reverse osmosis membranes, in particular to a polyamide reverse osmosis composite membrane and a preparation method thereof. Background technique [0002] Reverse osmosis composite membranes have excellent separation properties for small organic molecules and inorganic salt ions, and are widely used in seawater brackish water desalination, water purification, sewage reuse and other fields, and are of great significance to the utilization and protection of the earth's limited water resources. [0003] At present, the most conventional preparation process of reverse osmosis composite membrane is the interfacial polymerization method. During the interfacial polymerization reaction, the water phase monomer needs to diffuse to the oil phase reaction zone through the water-oil phase interface to react with the oil phase monomer, and with the formation of the polyamide active layer, the diffusion of the water ph...

Claims

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Application Information

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IPC IPC(8): B01D71/56B01D69/12B01D67/00B01D61/02C02F1/44
CPCY02A20/131
Inventor 不公告发明人
Owner 宁波日新恒力科技有限公司
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