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Polyamide nanofiltration membrane with pattern surface and preparation method

A polyamide and nanofiltration membrane technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of increasing the complexity of the membrane-making process, the complex chemical synthesis process, and the large amount of chemicals. The effect of improving water flux and salt selectivity and broad application prospects

Active Publication Date: 2021-01-29
TIANJIN POLYTECHNIC UNIV
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  • Claims
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Problems solved by technology

[0006] Chinese patent CN107837689A provides a method for preparing a composite nanofiltration membrane with an ultra-thin separation layer. An ultra-thin separation layer is obtained by adding polyol macromolecules and cross-linking agents to the water phase. However, due to the use of additives, the increase The complexity of the membrane-making process, and the ultra-thin separation layer limits its practical application due to its poor durability.
[0009] The above methods provide useful guidance for breaking through the trade-off effect between water flux and selectivity of nanofiltration membranes, and improve the separation performance of nanofiltration membranes to a certain extent, but there are complex chemical synthesis processes and low chemical consumption. Large, unstable structure and poor economy, which limit its large-scale application

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  • Polyamide nanofiltration membrane with pattern surface and preparation method
  • Polyamide nanofiltration membrane with pattern surface and preparation method
  • Polyamide nanofiltration membrane with pattern surface and preparation method

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preparation example Construction

[0035] The present invention has the preparation method of the polyamide nanofiltration membrane of pattern surface, it comprises the following steps:

[0036] The first step is to prepare aqueous phase and organic phase solutions: prepare an aqueous phase solution containing polyamines, the solvent of the aqueous phase solution is deionized water, and the concentration of monomers in the aqueous phase is 0.2 to 3.0% (w / v); prepare at least An acid chloride organic phase solution containing two reactive acid chloride groups, the organic phase monomer concentration is 0.01 to 2.0% (w / v);

[0037]The second step, interfacial polycondensation reaction: wash the supporting base film with deionized water and dry the surface moisture of the base film moderately, then immerse it in the aqueous phase solution prepared in the first step, dip coating at room temperature for 10s to 10min, remove the base film after taking it out The water phase solution remains on the surface; then immer...

Embodiment 1

[0047] Soak the polyvinyl chloride hollow fiber ultrafiltration membrane as the base membrane in the piperazine aqueous phase solution with a concentration of 0.2% (w / v) for 30s, then remove the excess aqueous phase solution with absorbent filter paper and dry it in the air for 300s, then The base film was immersed in a 0.1% (w / v) n-decane-trimesoyl chloride organic solution to react for 10 seconds, and the temperature of the organic phase solution was 0°C. After the reaction, the first polyamide nanofiltration membrane with a tubular topography pattern surface was obtained, such as figure 1 shown. The polyamide nanofiltration membrane with the surface of the tubular topography pattern was left to stand in the air for 15 minutes, and then washed with deionized water to be tested. The polyamide nanofiltration membrane with a tubular topography pattern surface obtained under this condition has a negative effect on Na 2 SO 4 The rejection rate is 92.6%, the rejection rate of N...

Embodiment 2

[0049] Soak the polyvinyl chloride hollow fiber base membrane in the piperazine aqueous phase solution with a concentration of 0.8% (w / v) for 5 minutes, then remove the excess aqueous phase solution with absorbent filter paper, dry it in the air for 30 seconds, and then immerse the base membrane in Reaction in the n-heptane-trimesoyl chloride organic solution with a concentration of 0.1% (w / v) for 2 minutes, the temperature of the organic phase solution is 0°C, and the second polyamide nanofiltration with a tubular topography pattern surface is obtained after the reaction film, such as figure 2 shown. The polyamide nanofiltration membrane with the surface of the tubular topography pattern was taken out, placed in the air for 15 minutes, and then washed with deionized water to be tested. The polyamide nanofiltration membrane with a tubular topography pattern surface obtained under this condition has a negative effect on Na 2 SO 4 The rejection rate is 95.2%, the rejection r...

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Abstract

The invention provides a polyamide nanofiltration membrane with a pattern surface. The polyamide nanofiltration membrane is formed by compounding a supporting base membrane and a polyamide separationlayer with a pattern surface; wherein the polyamide separation layer is subjected to interfacial polycondensation on the surface of the supporting base membrane, and the surface of the polyamide separation layer has patterns; through fine regulation and control of an interfacial polymerization reaction system and process parameters, the microstructure of a primary polymer film and the growth process of a separation layer are regulated to induce a polyamide surface with pattern morphology on the surface of a porous base film, and the nanofiltration membrane is endowed with good separation performance by the patterned surface; the membrane preparation method is simple, is convenient to realize in continuous industrial production, and is expected to have a wide application prospect in the aspects of wastewater salt separation recycling, seawater desalination and drinking water purification.

Description

technical field [0001] The invention relates to a polyamide nanofiltration membrane with a patterned surface and a preparation method thereof. Background technique [0002] In recent years, membrane separation technology has been highly valued by many countries, so it has also developed rapidly. Nanofiltration membrane is a new type of separation membrane developed on the basis of reverse osmosis membrane. Its separation performance and operating pressure are between reverse osmosis membrane and ultrafiltration membrane. Nanofiltration membrane has the advantages of high water flux and high rejection rate under low operating pressure, especially for multivalent ions and small molecular organic substances with a relative molecular weight of 200-1000 Daltons. Therefore, it has been widely used in the fields of water treatment, food and biomedicine. The development of new high-performance nanofiltration membranes is critical and necessary for the promotion and application of ...

Claims

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Application Information

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IPC IPC(8): B01D61/02B01D67/00B01D69/12B01D71/30B01D71/34B01D71/36B01D71/42B01D71/56B01D71/64B01D71/68B01D71/76C02F1/44
CPCB01D71/56B01D71/30B01D71/68B01D71/42B01D71/64B01D71/34B01D71/36B01D71/76B01D69/12B01D67/0006B01D61/027C02F1/442Y02A20/131
Inventor 武春瑞刘四华薛白厍景国史乐吕晓龙
Owner TIANJIN POLYTECHNIC UNIV
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