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Mixed diamine monomer adopted chlorine-resistant nanofiltration membrane and preparation method therefor

A diamine monomer, nanofiltration membrane technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve problems such as unsatisfactory nanofiltration membrane flux, achieve good industrial application prospects, reduce production Cost and effect of reducing usage

Inactive Publication Date: 2016-07-20
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, the specific examples of the above-mentioned patent formulations are all implemented on polyethersulfone materials. Practice has proved that if the base membrane is changed from a hydrophilic polyethersulfone membrane to a hydrophobic polysulfone membrane, for the same Formula, the same preparation environment, the flux of the obtained nanofiltration membrane is not ideal

Method used

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  • Mixed diamine monomer adopted chlorine-resistant nanofiltration membrane and preparation method therefor
  • Mixed diamine monomer adopted chlorine-resistant nanofiltration membrane and preparation method therefor
  • Mixed diamine monomer adopted chlorine-resistant nanofiltration membrane and preparation method therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～4

[0048] Preparation of mixed diamine monomer chlorine-resistant nanofiltration membrane:

[0049] A polysulfone flat ultrafiltration membrane with a molecular weight cut-off of 70,000 was selected as the bottom membrane. The bottom membrane was immersed in the aqueous phase solution containing mixed monomers for 5 minutes, and then the solution was removed. The membrane was purged with gas or dried naturally. After the surface is dry, immerse in the organic phase solution for 5 seconds, 10 seconds, 15 seconds and 30 seconds to carry out the interfacial polymerization reaction, then remove the organic solution on the surface of the film, and place the interfacially polymerized film in the air for 1 minute, then Put it into an oven at 80° C. for heat treatment for 5 minutes. After the heat treatment, the membrane was taken out, and then rinsed with deionized water for 5 minutes to prepare a nanofiltration membrane.

[0050] The content of 2,2'-bis(1-hydroxyl-1-trifluoromethyl-2,...

Embodiment 5～8

[0056] Basically the same as in Example 3, 2,2'-bis(1-hydroxyl-1-trifluoromethyl-2,2,2,-trifluoroethyl)-4,4'- The ratio of methylene dianiline and piperazine was adjusted, and the effect of piperazine content in the mixed monomer on the performance of nanofiltration membrane was investigated.

[0057] The mixed monomer nanofiltration membranes prepared in Examples 5-8 were tested for water flux and salt interception performance, and the test results are as follows.

[0058]

Embodiment 9～12

[0060] It is basically the same as in Example 3, 5-8, but it is not necessary to rinse the prepared nanofiltration membrane, and directly immerse the nanofiltration membrane obtained after heat treatment as a whole in 3000ppm effective sodium hypochlorite solution for oxidation treatment for 1 hour, then take it out, use Ionized water for rinsing.

[0061] The mixed monomer nanofiltration membranes prepared in Examples 9-12 were tested for water flux and salt interception performance, and the test results are as follows.

[0062]

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Abstract

The invention relates to a mixed diamine monomer adopted chlorine-resistant nanofiltration membrane and a preparation method therefor. An aqueous-phase monomer is prepared through mixing 2,2'-di(1-hydroxyl-1-trifluoromethyl-2,2,2-trifluoroethyl)-4,4'-methylene dianiline with piperazine. The preparation method comprises the following steps: (1) adjusting the temperature and humidity of an experimental environment; (2) carrying out basement membrane pretreatment; (3) preparing an aqueous-phase mixed monomer solution and an organic-phase solution; (4) carrying out an interface polymerization reaction; (5) carrying out heat treatment; (6) preparing an active chlorine solution; and (7) integrally submerging the prepared nanofiltration membrane into the active chlorine solution for oxidation treatment, thereby obtaining the final mixed diamine monomer adopted chlorine-resistant nanofiltration membrane. The mixed diamine monomer adopted chlorine-resistant nanofiltration membrane and the preparation method therefor have the advantages that the process is simple, process scale-up is facilitated, and the range of choice of basement membranes is enlarged, so that the industrial actual application value is remarkable.

Description

【Technical field】 [0001] The invention relates to the technical field of polymer membrane materials, in particular to a chlorine-resistant nanofiltration membrane using mixed diamine monomers and a preparation method thereof. 【Background technique】 [0002] As an emerging membrane process technology, nanofiltration is between reverse osmosis and ultrafiltration, and has the following significant advantages: high flux, low operating pressure, high interception for multivalent ions and low interception for low-valent ions, and lower operating costs. The molecular weight cut-off of the nanofiltration membrane is usually 200-1000Da, and its pore size is 0.5nm-2nm. Nanofiltration membrane technology has been widely used in the softening of drinking water, the removal of heavy metal ions in electroplating wastewater, the separation of molecules of different masses, the purification and concentration of the biopharmaceutical industry, the petroleum industry and the food industry, ...

Claims

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Application Information

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IPC IPC(8): B01D71/68B01D67/00
Inventor 许振良汤永健杨虎魏永明
Owner EAST CHINA UNIV OF SCI & TECH
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