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Polyamide composite nanofiltration membrane with main chain containing ether oxygen structure, and preparation method thereof

A composite nanofiltration membrane and polyamide technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc. Good and other problems, to achieve the effect of high permeation flux of pure water and good hydrophilicity

Active Publication Date: 2014-10-29
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention aims to solve the technical problems of poor hydrophilicity, low pure water permeation flux and poor pollution resistance of the nanofiltration membrane prepared by the existing method, thereby providing a polyamide with an ether oxygen structure in the main chain Composite nanofiltration membrane and preparation method thereof

Method used

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  • Polyamide composite nanofiltration membrane with main chain containing ether oxygen structure, and preparation method thereof
  • Polyamide composite nanofiltration membrane with main chain containing ether oxygen structure, and preparation method thereof
  • Polyamide composite nanofiltration membrane with main chain containing ether oxygen structure, and preparation method thereof

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specific Embodiment approach 1

[0018] Embodiment 1: The structural formula of a polyamide composite nanofiltration membrane with an ether oxygen structure in the main chain of this embodiment is:

[0019]

specific Embodiment approach 2

[0020] Specific embodiment two: the preparation method of the polyamide composite nanofiltration membrane of a kind of main chain containing ether oxygen structure of the present embodiment is to carry out according to the following steps:

[0021] 1. Prepare the polymer ultrafiltration base membrane with the phase inversion method of the hollow fiber base membrane, and then remove the surface moisture of the polymer ultrafiltration base membrane to obtain a polymer ultrafiltration base membrane with no moisture on the surface;

[0022] 2. Configure an amino-terminated polyethylene oxide solution with a concentration of 0.05wt% to 10.0wt%;

[0023] 3. Use the amino-terminated polyethylene oxide solution configured in step 2 to soak the surface-free polymer ultrafiltration base membrane obtained in step 1 for 30s to 30 minutes, and dry in the shade after soaking to obtain a dry ultrafiltration base membrane;

[0024] 4. Dissolving the polyacyl chloride in an organic solvent, an...

specific Embodiment approach 3

[0028] Specific embodiment three: the difference between this embodiment and specific embodiment two is: the hollow fiber base membrane described in step one is PEI (polyetherimide), PS (polysulfone), PES (polyethersulfone), PAN (polyacrylonitrile), PVDF (polytetrafluoroethylene) or PP (polypropylene). Others are the same as in the second embodiment.

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Abstract

The invention relates to a preparation method of a membrane, and in particular relates to a polyamide composite nanofiltration membrane with a main chain containing an ether oxygen structure, and a preparation method of the polyamide composite nanofiltration membrane, aiming at solving the technical problems that the nanofiltration membrane prepared by the existing method is poor in hydrophilia, low in pure water permeation flux and poor in pollution resistance. The preparation method comprises the steps of 1, preparing a polymer ultrafiltration base membrane without water on the surface; 2, preparing amino-terminated polyethylene oxide solution; 3, preparing a dry ultrafiltration base membrane; 4, preparing multielement acyl chloride solution; and 5, preparing the polyamide composite nanofiltration membrane with the main chain containing the ether oxygen structure. The polyamide composite nanofiltration membrane with the main chain containing the ether oxygen structure has a unique cross-linked network-shaped pore structure, is good in hydrophilia, high in pure water permeation flux and low in molecular weigh cut-off, is capable of resisting pollution, and is easy to clean. The method is suitable for a nanofiltration separation process. The invention is applied to the preparation field of the nanofiltration membrane.

Description

technical field [0001] The invention relates to a method for preparing a membrane, in particular to a method for preparing a polyamide composite nanofiltration membrane whose main chain contains an ether oxygen structure. Background technique [0002] The nanofiltration process started in the mid-to-late 1980s and is a new pressure-driven physical separation process without phase change. The pore size of the nanofiltration membrane is larger than that of the ultrafiltration membrane but smaller than that of the reverse osmosis membrane. Therefore, when the nanofiltration membrane first came out, it was called a loose reverse osmosis membrane. The characteristic of nanofiltration membrane is that it has a high rejection rate for divalent and multivalent ions, and its molecular weight cut-off ranges from 200 to 1000 g·mol -1 , while the rejection rate of monovalent ions is relatively low. Although the membrane separation process originated from water treatment, with the deve...

Claims

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Application Information

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IPC IPC(8): B01D71/56B01D69/12B01D67/00
Inventor 邵路程喜全
Owner HARBIN INST OF TECH
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