Composite nanofiltration membrane and preparation method thereof

A technology of composite nanofiltration membrane and ultrafiltration base membrane, which is applied in the field of composite nanofiltration membrane and its preparation, can solve the problem of poor stability of modified membrane by surface modification method, difficult control of blending process, complex layer-by-layer self-assembly process, etc. problems, to achieve the effect of good hydrophilic performance, good separation performance and various forms

Inactive Publication Date: 2017-12-15
SHENZHEN INST OF ADVANCED TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the disadvantage is that they all have strong hydrophobicity
However, the above method needs to adopt preparation techniques such as casting solution blending phase inversion method, surface modification method or layer-by-layer self-assembly method. The properties have a great correlation; the surface modification method has poor stability and short service life; the layer-by-layer self-assembly process is complicated and difficult to operate

Method used

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  • Composite nanofiltration membrane and preparation method thereof
  • Composite nanofiltration membrane and preparation method thereof
  • Composite nanofiltration membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] (1) Weigh PEG 1000 (0.125g), sodium hydroxymethylcellulose (0.125g), sodium lauryl sulfate (0.01g) and sodium hydroxide (0.05g) into 50ml of deionized water, Heat and stir to dissolve it completely, then cool to room temperature to obtain an aqueous phase solution;

[0042] (2) Soak the polysulfone ultrafiltration base membrane in the aqueous phase solution for 30 minutes;

[0043] (3) Remove excess aqueous phase solution, and then place the film in a constant temperature box to dry at 30°C (about 30min);

[0044] (4) Measure 1.0 g of hexamethylene diisocyanate and dissolve it in 50 ml of n-hexane solution to obtain an organic phase solution;

[0045] (5) Soak the dried film in the organic phase solution for 30 minutes;

[0046] (6) Remove the excess organic phase solution, place the reacted membrane in a constant temperature oven for drying at 60°C, rinse it with water, pre-press and form it, and then conduct a membrane performance test.

[0047] The prepared membrane...

Embodiment 2

[0068] (1) Weigh PEG200 (0.125g), sodium hydroxymethylcellulose (0.125g), sodium lauryl sulfate (0.01g) and sodium hydroxide (0.05g) into 50ml deionized water, heat Stir to dissolve it completely, then cool to room temperature to obtain an aqueous phase solution;

[0069] (2) Soak the polysulfone ultrafiltration base membrane in the aqueous phase solution for 30 minutes;

[0070] (3) Remove excess aqueous phase solution, and then place the film in a constant temperature box to dry at 30°C (about 30min);

[0071] (4) Measure 1.0 g of hexamethylene diisocyanate and dissolve it in 50 ml of n-hexane solution to obtain an organic phase solution;

[0072] (5) Soak the dried film in the organic phase solution for 30 minutes;

[0073] (6) Remove the excess organic phase solution, place the reacted membrane in a constant temperature oven for drying at 60°C, rinse it with water, pre-press and form it, and then conduct a membrane performance test.

[0074] The prepared membrane was pr...

Embodiment 3

[0076] (1) Weigh PEG600 (0.125g), sodium hydroxymethylcellulose (0.125g), sodium lauryl sulfate (0.01g) and sodium hydroxide (0.05g) into 50ml deionized water, heat Stir to dissolve it completely, then cool to room temperature to obtain an aqueous phase solution;

[0077] (2) Soak the polysulfone ultrafiltration base membrane in the aqueous phase solution for 30 minutes;

[0078] (3) Remove excess aqueous phase solution, and then place the film in a constant temperature box to dry at 30°C (about 30min);

[0079] (4) Measure 1.0 g of hexamethylene diisocyanate and dissolve it in 50 ml of n-hexane solution to obtain an organic phase solution;

[0080] (5) Soak the dried film in the organic phase solution for 30 minutes;

[0081] (6) Remove the excess organic phase solution, place the reacted membrane in a constant temperature oven for drying at 60°C, rinse it with water, pre-press and form it, and then conduct a membrane performance test.

[0082] The prepared membrane was pr...

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Abstract

The invention relates to a composite nanofiltration membrane and a preparation method thereof. The preparation method comprises the following steps: adding polyol, a binder, a surfactant and an alkaline agent into water, stirring and dissolving, to obtain an aqueous solution; adding an isocyanate monomer into an organic solvent, stirring and dissolving, to obtain an organic phase solution; soaking an ultrafiltration base membrane into the aqueous solution, then taking out and drying; soaking the dried the ultrafiltration base membrane into the organic phase solution for reacting, to obtain a prefinished nanofiltration membrane product; performing thermal treatment to the prefinished nanofiltration membrane product, to obtain the composite nanofiltration membrane. Therefore, the composite nanofiltration membrane prepared by using the preparation method has high retention rate and permeation flux. By adopting an interfacial polymerization mode, the operations are simplified compared with the prior art, the technology is easily controlled, and the defects that the thickness uniformity of an active layer is bad and the separation performance of the membrane is influenced by using coating and other modification methods can also be overcome.

Description

technical field [0001] The invention relates to the technical field of membrane separation, in particular to a composite nanofiltration membrane and a preparation method thereof. Background technique [0002] Membrane separation can be operated under mild conditions without phase transition, and is one of the important technologies in the chemical industry. The core of membrane separation is the membrane, and the structure and physical and chemical properties of the membrane material are crucial to the separation performance. Commonly used membrane materials are polyvinylidene fluoride, polysulfone, polyethersulfone and polyacrylonitrile. These materials have excellent anti-ultraviolet and aging resistance, and good chemical stability. They are not corroded by acids and alkalis at room temperature, and they also have good thermal stability and mechanical strength. They are excellent film-forming materials. However, the disadvantage is that they all have strong hydrophobici...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D69/02B01D69/10B01D67/00B01D71/54
CPCB01D61/027B01D67/0093B01D69/02B01D69/105B01D69/125B01D71/54B01D2325/24B01D2325/36
Inventor 苗晶江志彬廖海龙蔡畅唐浩林涂凯张玲陈顺权
Owner SHENZHEN INST OF ADVANCED TECH
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