Method for preparing ultra-thin film through micro-phase diffusion control interface polymerization

A technology of diffusion control and interfacial polymerization, applied in the field of membrane separation, can solve problems such as poor treatment effect

Inactive Publication Date: 2017-12-29
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The treatment of micro-polluted water bodies is currently receiving widespread attention, and the traditional coag

Method used

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  • Method for preparing ultra-thin film through micro-phase diffusion control interface polymerization
  • Method for preparing ultra-thin film through micro-phase diffusion control interface polymerization
  • Method for preparing ultra-thin film through micro-phase diffusion control interface polymerization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) PEI is dissolved in water, and the concentration is 1.25wt%; TMC is dissolved in n-hexane, and the concentration is 0.15wt%, and it is evenly stirred for use;

[0038] (2) Fix the pretreated PS base film on the film carrier, and adjust the motor speed to be constant;

[0039] (3) PEI and TMC solutions are placed in pressure barrels respectively;

[0040] (4) Spray the PEI solution onto the surface of the porous support and let stand for 120s;

[0041] (5) Spray the TMC solution onto the membrane surface, let it stand for 120s, and react to form a polyamide separation layer;

[0042] (6) Remove the polyamide film that has been sprayed, put it in an oven for low-temperature drying for a certain period of time, take it out, soak it in 0.2g / L glutaraldehyde aqueous solution for 24 hours, wash it with a large amount of deionized water, and store it in deionized water. Deionized water for use.

[0043] The nanofiltration performance test of the above membrane was carri...

Embodiment 2

[0046] (1) PEI is dissolved in water, and the concentration is 1.25wt%; TMC is dissolved in n-hexane, and the concentration is 0.15wt%, and it is evenly stirred for use;

[0047](2) Fix the pretreated PS base film on the film carrier, and adjust the motor speed to be constant;

[0048] (3) PEI and TMC solutions are placed in pressure barrels respectively;

[0049] (4) Spray the PEI solution onto the surface of the porous support and let stand for 120s;

[0050] (5) The TMC solution is sprayed onto the membrane surface, and left to stand for 120s to form a polyamide separation layer;

[0051] (6) repeat (4) (5) step four times, can form five layers of polyamide separation layers on the basement membrane surface;

[0052] (7) Remove the polyamide film that has been sprayed, put it in an oven for low-temperature drying for a certain period of time, take it out, soak it in 0.2g / L glutaraldehyde aqueous solution for 24 hours, take it out, wash it with a large amount of deionized ...

Embodiment 3

[0056] (1) MPD is dissolved in water, and the concentration is 1.25wt%; TMC is dissolved in n-hexane, and the concentration is 0.15wt%, and it is evenly stirred for use;

[0057] (2) Fix the pretreated PS base film on the film carrier, and adjust the motor speed to be constant;

[0058] (3) MPD and TMC solutions are placed in pressure barrels respectively;

[0059] (4) Spray the MPD solution onto the surface of the porous support, and let it stand for 120s;

[0060] (5) The TMC solution is sprayed onto the membrane surface, and left to stand for 120s to form a polyamide separation layer;

[0061] (6) repeat (4) (5) step four times, can form five layers of polyamide separation layers on the basement membrane surface;

[0062] (7) Remove the polyamide film that has been sprayed, put it in an oven for low-temperature drying for a certain period of time, take it out, soak it in 0.2g / L glutaraldehyde aqueous solution for 24 hours, take it out, wash it with a large amount of deion...

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Abstract

The invention discloses a method for preparing an ultra-thin film through micro-phase diffusion control interface polymerization and belongs to the technical field of membrane separation. The method comprises the following steps: firstly, spraying a layer of an active amino monomer on a porous support, further spraying a layer of an active acyl chloride monomer, enabling the two components to react to generate a polyamide layer, and repeatedly spraying to generate multiple polyamide separation layers; soaking a prepared membrane into a glutaraldehyde solution, and performing a cross-linking reaction with unreacted amino to form an internal network structure, thereby improving the density grade and the structural stability of the membrane. The method is a novel interface polymerization method by dispersing a bulk phase reaction solution into micro droplets, converting bulk phase diffusion into micro phase diffusion and eliminating later diffusion process. Through a spraying atomization function, a reaction solution is dispersed into micron-order droplets, and the bulk phase diffusion is converted into micro phase diffusion. The sizes of the droplets are at a micron grade, and reaction monomers in the droplets can be completely reacted in the bulk phase diffusion process. When being applied to the field of nano filtration, the prepared membrane has super-high flux and a relatively high retention rate.

Description

technical field [0001] The invention relates to a method for preparing an ultra-thin film by microphase diffusion controlled interface polymerization, and belongs to the technical field of membrane separation. Background technique [0002] The treatment of micro-polluted water bodies has attracted widespread attention at present, and the traditional coagulation, sedimentation, filtration, and disinfection treatment processes have poor treatment effects on such water sources. In the upgrading of drinking water treatment technology, nanofiltration membrane technology has become the best choice for treating slightly polluted water due to its good water effluent effect, low energy consumption, and the ability to remove trace herbicides, disinfection by-products, heavy metals and some hardness. preferred technology. [0003] At present, the most commonly used method for preparing commercial composite nanofiltration membranes is the interfacial polymerization method. For the mem...

Claims

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Application Information

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IPC IPC(8): B01D71/56B01D69/12B01D67/00C02F1/44
CPCB01D67/0006B01D69/125B01D71/56C02F1/442
Inventor 单玲珑顾佳慧范红玮纪树兰张国俊
Owner BEIJING UNIV OF TECH
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