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Polyamide hollow fiber composite separation membrane and preparation method

A fiber composite and polyamide technology, which is applied in the field of polyamide hollow fiber composite separation membrane and its preparation, can solve the problem of continuous production of hollow fiber composite separation membrane, uneven thickness of separation layer of hollow fiber composite separation membrane, and solution viscosity Small and other problems, to achieve the effect of improving membrane separation performance, improving membrane strength and operation stability, and uniform thickness

Active Publication Date: 2021-04-16
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But this method is not suitable for the continuous production of hollow fiber composite separation membranes, because the concentration of amine monomer aqueous solution and acid chloride monomer oil solution is usually low, and the viscosity of the solution is small. It is often uneven, resulting in uneven thickness of the separation layer of the final prepared hollow fiber composite separation membrane, and a large difference in performance

Method used

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  • Polyamide hollow fiber composite separation membrane and preparation method
  • Polyamide hollow fiber composite separation membrane and preparation method
  • Polyamide hollow fiber composite separation membrane and preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0041] Prepare a polyamide hollow fiber composite reverse osmosis membrane, the specific method is as follows:

[0042] 1) Mixing: mix polyvinylidene fluoride with a mass fraction of 20%, diphenyl carbonate with a mass fraction of 79.9%, and trimesoyl chloride with a mass fraction of 0.1% as a casting solution, and pass through a twin-screw extruder Mix well at 220°C;

[0043] 2) Composite membrane preparation: Extrude the casting solution in step 1) to the spinneret with a twin-screw extruder to form a hollow fiber membrane, and enter the temperature after passing through the air section at room temperature with a temperature of 25°C and a concentration of 2.0% by weight. Cool the water bath in the m-phenylenediamine aqueous solution for 120s. While solidifying and forming a film, trimesoyl chloride and the m-phenylenediamine in the water bath undergo interfacial polymerization to form a polyamide layer. Dry at 80°C for 10 minutes to obtain polyvinylidene fluoride-containing ...

Embodiment 2

[0046] A kind of polyamide hollow fiber composite reverse osmosis membrane is prepared, the mass fraction of polyvinylidene fluoride in the 1) mixing step in embodiment 1 is increased to 40%, and diphenyl carbonate mass fraction is reduced to 59.9%, and other conditions are not changed. Change.

Embodiment 3

[0048] To prepare a polyamide hollow fiber composite reverse osmosis membrane, the concentration of phenylenediamine in the 2) composite membrane preparation step in Example 1 was increased to 5% by weight, and other conditions remained unchanged.

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Abstract

The invention relates to a polyamide hollow fiber composite separation membrane and a preparation method thereof. The method comprises the following steps: a) mixing: uniformly mixing a high polymer, a diluent and an acyl chloride monomer to form a membrane casting solution; b) preparing a composite membrane: extruding the membrane casting solution by using an extruder to form a hollow fiber membrane shape, introducing the hollow fiber membrane shape into a cooling water bath in an amine monomer aqueous solution, carrying out interfacial polymerization on an acyl chloride monomer and an amine monomer to generate a polyamide layer while curing to form the membrane, and drying to obtain the composite membrane containing a polymer porous support layer and a polyamide separation layer; and c) post-treatment of the composite membrane: immersing the composite membrane obtained in the step b) into an extraction agent, and extracting the diluent in the membrane to obtain the polyamide hollow fiber composite separation membrane. The acyl chloride monomer is mixed in the support layer membrane casting solution, so that the acyl chloride monomer can be uniformly dispersed on the surface of the prepared support layer, and meanwhile, the acyl chloride monomer is pre-dispersed in the support layer, so that the binding force of the polyamide separation layer and the support layer can be effectively improved, and the structural stability of the prepared hollow fiber composite membrane is improved.

Description

technical field [0001] The invention relates to a polyamide hollow fiber composite separation membrane and its preparation technology, in particular to a method for preparing a polyamide hollow fiber composite separation membrane through an integrated process of thermally induced phase separation and interfacial polymerization and the polyamide hollow fiber prepared thereby Composite separation membrane. Background technique [0002] Due to the functions of separation, concentration and purification, membrane technology has been widely used in food, medicine, biology, environmental protection, chemical industry, water treatment and other fields, and has become one of the most important means in today's separation science. Among them, nanofiltration and reverse osmosis technologies have received more and more attention because of their efficient desalination capabilities. Both nanofiltration and reverse osmosis are pressure-driven membranes. Compared with traditional thermal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D69/12B01D69/08B01D69/10B01D71/56
Inventor 林亚凯王晓琳汪林任丹
Owner TSINGHUA UNIV
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