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One-step formed hollow fiber nanofiltration membrane filament and preparation method thereof

A nanofiltration membrane and hollow technology, which is applied to the field of one-step forming hollow fiber nanofiltration membrane and its preparation, can solve the problems of large pore size and low pollution resistance, and achieves small pore size, strong pollution resistance, and good pollution resistance. sexual effect

Active Publication Date: 2020-03-27
NANJING WEIXIN ENVIRONMENTAL PROTECTION EQUIP TECH RES INST CO LTD
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0005] The object of the present invention is to provide a hollow fiber nanofiltration membrane and a preparation method thereof in which the phase separation of the base membrane and the interfacial polymerization of the nanofiltration functional layer are carried out simultaneously, and the hollow fiber nanofiltration membrane solves the problem of anti-pollution of the membrane surface, The problem with large apertures

Method used

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  • One-step formed hollow fiber nanofiltration membrane filament and preparation method thereof
  • One-step formed hollow fiber nanofiltration membrane filament and preparation method thereof
  • One-step formed hollow fiber nanofiltration membrane filament and preparation method thereof

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preparation Embodiment 1

[0032] In this scheme, a one-step hollow fiber nanofiltration membrane filament is prepared with the following parameters.

[0033] Membrane case one:

[0034] A one-step forming hollow fiber nanofiltration membrane filament, the membrane making system includes feed liquid and core liquid.

[0035] The feed liquid is prepared by mixing and dissolving hydrophilic polymers, solvents, non-solvents and feed liquid additives, and then undergoes vacuum defoaming treatment.

[0036] The core fluid is prepared by mixing and dissolving corresponding solvents, non-solvents and core fluid additives. The hydrophilic polymers are polyethersulfone and sulfonated polyethersulfone. The solvent is dimethylacetamide, the non-solvent is polyethylene glycol 400, the feed liquid auxiliary agent is polyethyleneimine, and the core liquid auxiliary agent is glutaraldehyde.

[0037] According to the weight ratio, take 25 parts of hydrophilic polymers, 18.5 parts of non-solvents, 54.5 parts of solve...

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Abstract

The invention provides a one-step formed hollow fiber nanofiltration membrane filament and a preparation method thereof, and solves the problems that the nanofiltration membrane preparation process istedious and the thickness of a coating layer or the cross-linking reaction degree is difficult to control. In the spinning process, a hydrophilic polyethyleneimine hydrophilic group can automaticallymigrate to the surface of a membrane for synchronous cross-linking reaction with glutaraldehyde or ethylene glycol in a core liquid in a phase separation process, a non-solvent phase separation process of a base membrane and a cross-linking reaction of a nanofiltration selection layer are carried out synchronously, by controlling the spinning speed and the core liquid temperature, interfacial polymerization or post-cross-linking step is not needed, and the internal pressure type hollow fiber nanofiltration membrane can be obtained by one-step forming.

Description

technical field [0001] The invention relates to the field of hollow fiber nanofiltration membranes, in particular to a one-step formed hollow fiber nanofiltration membrane filament and a preparation method thereof. Background technique [0002] Nanofiltration membrane (Nanofiltration Membranes) is a new type of separation membrane that came out in the late 1980s. Its molecular weight cut-off is between reverse osmosis membrane and ultrafiltration membrane, about 200-2000. At present, roll-type nanofiltration membranes of many companies such as Dow and General Electric occupy a dominant position in the market. These membranes are composite membranes, which are prepared by interfacial polymerization and condensation. The surface of the basement membrane is made of a layer of ultra-thin separation layer (TFC) with nano-scale pores. [0003] However, interfacial polymerization and condensation methods have many disadvantages, such as high cost, low stain resistance, low resista...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/82B01D69/08B01D69/02B01D67/00
CPCB01D67/0093B01D69/02B01D69/08B01D71/82B01D2325/02
Inventor 魏晞唐宇攀刘军汪旺华
Owner NANJING WEIXIN ENVIRONMENTAL PROTECTION EQUIP TECH RES INST CO LTD
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