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Ultrafiltration membrane and preparation method thereof

A technology for the preparation of ultrafiltration membranes and additives, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc. Good performance, improved hydrophilicity, easy to clean

Active Publication Date: 2017-01-11
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the method of blending hydrophilic materials will continuously wash out the hydrophilic materials in the membrane with the use of the membrane, so that the hydrophilicity of the membrane will gradually decrease, and the membrane flux will also decrease; the surface coating method will lead to the loss of the membrane. The initial flux is low. In addition, with the prolongation of the use time, the surface of the membrane is easily washed away, thereby losing the anti-pollution performance; and the surface ray irradiation grafting method, the processing technology is cumbersome and the processing equipment is complicated.

Method used

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  • Ultrafiltration membrane and preparation method thereof
  • Ultrafiltration membrane and preparation method thereof
  • Ultrafiltration membrane and preparation method thereof

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preparation example Construction

[0061] The invention provides a method for preparing an ultrafiltration membrane, comprising:

[0062] The polymer having the structure of formula (I) or formula (II) is mixed with additives, reacted, defoamed, and molded to obtain an ultrafiltration membrane;

[0063]

[0064] Wherein, x and n are degrees of polymerization, 1≤x≤20, preferably 1≤x≤10, more preferably 1≤x≤5;

[0065] 1≤n≤10000; preferably 10≤n≤8000, more preferably 50≤n≤5000;

[0066] Ar0 selected from one or both of

[0067]

[0068] Wherein, m and n are degree of polymerization, 0≤m≤10000, preferably 10≤m≤8000, more preferably 50≤m≤5000;

[0069] 1≤n≤10000, preferably 10≤n≤8000, more preferably 50≤n≤5000;

[0070] Ar 1 selected from one of

[0071] Ar 2 selected from one of

[0072] Ar 3 selected from one of

[0073] R 1 , R 2 selected from -H, One of.

[0074] In the present invention, firstly, the polymer and the additive are reacted and dissolved. The reaction temperature i...

Embodiment 1

[0096] According to the method disclosed in CN101735447A, the polymer PES-TA (n=100) as shown in formula (a) is prepared, and 100 grams of the above-mentioned polymer dried in advance, solvent N,N-dimethylacetamide (DMAC) 800 milliliters and 100 milliliters of additive ethylene glycol monomethyl ether (EGM) were sequentially added to a reaction kettle with a total volume of 2 liters, heated to 50° C., and stirred for 5 hours to completely dissolve them. After filtration and vacuum defoaming, mature in a constant temperature room at 30°C for 12 hours. Using the non-woven fabric as the base material, scrape a nascent film with a liquid layer thickness of 150 microns on it with a film scraping machine, and then immerse it in a coagulation bath deionized water to form it. After fully washing, it is wound up to obtain an ultrafiltration membrane. The method of the present invention was used to measure its performance, and the results are shown in Table 1. Table 1 shows the perform...

Embodiment 2

[0101] According to the method disclosed in CN101735447A, the polymer PES-TA (n=100) as shown in formula (a) is prepared, 100 grams of the above-mentioned polymer that has been dried in advance, 800 milliliters of solvent N-methylpyrrolidone (NMP), additives Add 50 grams of polyethylene glycol 400 (PEG-400) successively to a reaction kettle with a total volume of 2 liters, heat to 50° C., and stir for 5 hours to completely dissolve it. After filtration and vacuum defoaming, mature in a constant temperature room at 30°C for 12 hours. Using the non-woven fabric as the base material, scrape a nascent film with a liquid layer thickness of 150 microns on it with a film scraping machine, and then immerse it in a coagulation bath deionized water to form it. After fully washing, it is wound up to obtain an ultrafiltration membrane. The method of the present invention was used to measure its performance, and the results are shown in Table 2. Table 2 shows the performance measurement r...

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Abstract

The invention provides an ultrafiltration membrane, which is prepared from a polymer having a structure of formula (I) or formula (II) and an additive. The preparation method of the ultrafiltration membrane provided by the present invention comprises: mixing, reacting, degassing, and forming a membrane to obtain an ultrafiltration membrane by mixing a polymer having a structure of formula (I) or formula (II) with an additive. The ultrafiltration membrane provided by the invention is prepared from polymers and additives of formula (I) or formula (II), the polymer contains tertiary amine groups, the introduction of this group can improve the hydrophilicity of the polymer , and the membrane prepared by the polymer has high flux, good anti-fouling performance, and is easy to clean after being polluted. Experimental results show that the flux of the membrane prepared by the invention is 486-960 L / m2.h, and the attenuation rate of permeation flux within 12 hours is within 34%.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to an ultrafiltration membrane and a preparation method thereof. Background technique [0002] Ultrafiltration membrane is a microporous filtration membrane with consistent pore size and rated pore size ranging from 1 to 20 nanometers. Appropriate pressure is applied to one side of the membrane to screen out solute molecules smaller than the pore size. UF membranes usually have a molecular weight cut-off range of 1,000-1,000,000, and are widely used in water treatment, chemical filtration, and other fields. Membrane fouling refers to the adsorption and deposition of particles, colloidal particles or solute macromolecules in the feed liquid on the surface of the membrane or in the pores of the membrane due to physical and chemical interaction or physical deposition with the membrane during the membrane filtration process. Smaller or clogged, the membrane produces an irrev...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D69/00B01D67/00
Inventor 张奇峰李胜海张所波
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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