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A kind of preparation method of polyamide composite nanofiltration membrane whose main chain contains ether oxygen structure

A composite nanofiltration membrane and polyamide technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of poor hydrophilicity, poor pollution resistance and pure water permeation flux of nanofiltration membranes Low-level problems, to achieve the effect of high permeation flux of pure water, good hydrophilicity, and low molecular weight cut-off

Active Publication Date: 2016-08-24
HARBIN INST OF TECH
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  • 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 Preparation method of composite nanofiltration membrane

Method used

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  • A kind of preparation method of polyamide composite nanofiltration membrane whose main chain contains ether oxygen structure
  • A kind of preparation method of polyamide composite nanofiltration membrane whose main chain contains ether oxygen structure

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specific Embodiment approach 1

[0016] Specific embodiment one: 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:

[0017] 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;

[0018] 2. Configure an amino-terminated polyethylene oxide solution with a concentration of 0.05wt% to 10.0wt%;

[0019] 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;

[0020] 4. Dissolving the polyacyl chloride in an organic solvent, an...

specific Embodiment approach 2

[0024] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the hollow fiber base membrane described in step 1 is PEI (polyetherimide), PS (polysulfone), PES (polyethersulfone), PAN (polyacrylonitrile), PVDF (polytetrafluoroethylene) or PP (polypropylene). Others are the same as in the first embodiment.

specific Embodiment approach 3

[0025] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that: in Step 2, the solution of amino-terminated polyethylene oxide with a concentration of 0.5 wt% to 10.0 wt% is prepared. Others are the same as in the first or second embodiment.

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Abstract

The invention discloses a preparation method of a polyamide composite nanofiltration membrane whose main chain contains an ether oxygen structure, and relates to a preparation method of the membrane. The invention aims to solve the technical problems that the nanofiltration membrane prepared by the existing method has poor hydrophilicity, low pure water permeation flux and poor pollution resistance. The preparation method of the present invention is: 1. preparing a polymer ultrafiltration base membrane without moisture on the surface; 2. configuring an amino-terminated polyethylene oxide solution; 3. preparing a dry ultrafiltration base membrane; Preparation of polyamide composite nanofiltration membrane with main chain containing ether oxygen structure. The polyamide composite nanofiltration membrane with ether oxygen structure in the main chain prepared by the present invention has a unique cross-network pore structure, good hydrophilicity, high pure water permeation flux, low molecular weight cut-off, anti-pollution and easy to clean. The method is suitable for nanofiltration separation process. The invention is applied to the field of preparation of nanofiltration membranes.

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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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/56B01D69/12B01D67/00
Inventor 邵路程喜全
Owner HARBIN INST OF TECH
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