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A kind of preparation method of low pressure polymer decolorization nanofiltration membrane and its product and application

A technology of polymer and nanofiltration membrane, which is applied in the direction of chemical instruments and methods, membrane, membrane technology, etc., can solve the problems of short service life of nanofiltration membrane, low carboxyl reactivity, weak non-chemical bond combination, etc., and achieve good oxidation resistance ability, fast cross-linking reaction rate, and high-throughput effects

Active Publication Date: 2022-03-08
GUIZHOU MATERIAL IND TECH INSTITUE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this kind of membrane surface pretreatment that hydrolyzes nitrile groups into carboxyl groups not only destroys the microstructure of the ultrafiltration base membrane and causes the membrane pores to become larger, but also the carboxyl groups themselves have very low reactivity and are still weakly bonded to amine groups. Non-chemical bonding; in addition, with Fe 3+ The formation of complexation is also an unstable structure, which makes it easy to be damaged or the separation layer falls off during use, resulting in a short service life of the nanofiltration membrane

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Embodiment 1: A kind of preparation method of low-pressure polymer decolorization nanofiltration membrane:

[0036] S1, in terms of parts by mass, take 17 parts of chlorinated polyvinyl chloride, 1.7 parts of polystyrene / N-phenylmaleimide / epoxy functional group copolymer, and 7 parts of polyethylene glycol (800g / mol) and 74.3 parts of dimethyl sulfoxide, stirred and dissolved in a kettle at 70°C, mixed, and fully defoamed to obtain a polymer solution; The surface of the ester nonwoven fabric is scraped at a speed of 0.2m / s to form a flat film. The thickness of the flat film is 300μm. After air cooling, it is solidified in room temperature water and then soaked in an ethanol / water mixture with a mass ratio of 1:1 at room temperature. Washing twice, 1 hour each time, removing the solvent and porogen, taking out and drying to obtain a polymer blend ultrafiltration membrane with a thickness of 200 μm and a pore size of 5 nm;

[0037] S2. The surface of the polymer blend ul...

Embodiment 2

[0040] Embodiment 2: A kind of preparation method of low-pressure polymer decolorization nanofiltration membrane:

[0041] S1, in parts by mass, take 17 parts of chlorinated polyvinyl chloride, 3.4 parts of polystyrene / N-phenylmaleimide / epoxy functional group copolymer, 7 parts of polyethylene glycol (800g / mol) and 72.6 parts of dimethyl sulfoxide, stirred and dissolved in a kettle at 70°C, mixed, and fully defoamed to obtain a polymer solution; The surface of the ester nonwoven fabric is scraped at a speed of 0.2m / s to form a flat film. The thickness of the flat film is 300μm. After air cooling, it is solidified in room temperature water and then soaked in an ethanol / water mixture with a mass ratio of 1:1 at room temperature. Washing twice, 1 hour each time, removing the solvent and porogen, taking out and drying to obtain a polymer blend ultrafiltration membrane with a thickness of 208 μm and a pore size of 6 nm;

[0042] S2. The surface of the blended polymer ultrafiltrati...

Embodiment 3

[0045] Embodiment 3: A kind of preparation method of low-pressure polymer decolorization nanofiltration membrane:

[0046] S1, in parts by mass, get 17 parts of chlorinated polyvinyl chloride, 3.4 parts of polybutadiene / acrylonitrile / styrene / epoxy functional group tetrapolymer, 7 parts of polyethylene glycol (800g / mol) and 72.6 parts of dimethyl sulfoxide, stirred and dissolved in a kettle at 70°C, mixed, and fully defoamed to obtain a polymer solution; The surface of the non-woven fabric is scraped at a speed of 0.2m / s to form a flat film. The thickness of the flat film is 300μm. After air cooling, it is solidified in water at room temperature; then soaked and washed with ethanol / water mixture with a mass ratio of 1:1 at room temperature 2 times, 1 hour each time, remove the solvent and porogen, take out and dry to obtain a polymer blend ultrafiltration membrane with a thickness of 205 μm and a pore size of 7 nm;

[0047] S2. The surface of the blended polymer ultrafiltratio...

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Abstract

The invention discloses a preparation method of a low-pressure polymer decolorization nanofiltration membrane, which comprises the following steps: S1, taking a polymer, a copolymer, a porogen and a solvent, mixing it with a solvent to form a polymer solution, coating it on the surface of a nonwoven fabric, and forming a polymer solution. Washing to remove the solvent and porogen to obtain the blended polymer ultrafiltration membrane; S2, coating the surface of the blended polymer ultrafiltration membrane obtained in S1 with a polyamine solution for cross-linking reaction to form a nanofiltration separation layer; S3, applying S2 The obtained ultrafiltration membrane is obtained by heat treatment; the product and application thereof are also disclosed. The low-pressure polymer decolorization nanofiltration membrane of the present invention is resistant to oxidation, thin in thickness, does not fall off during use, and can efficiently separate multivalent ions and colored soluble organic substances. The membrane has good hydrophilicity, pollution resistance and permeation flux; In addition, the preparation method of the nanofiltration membrane has a simple process, can be produced in a large scale, and has good industrial application prospects.

Description

technical field [0001] The invention relates to the technical field of nanofiltration membrane separation, in particular to a preparation method of a low-pressure polymer decolorization nanofiltration membrane and its products and applications. Background technique [0002] Nanofiltration membrane is a pressure-driven membrane between reverse osmosis membrane and ultrafiltration membrane. Because of its pore size between 1 and 2nm, this type of membrane can be used under lower pressure conditions (compared to reverse osmosis Membrane) efficiently intercepts divalent and multivalent salts and organic compounds with a molecular weight of 200-1000 g / mol, while the rejection rate for monovalent ions is very low. It has been widely used in hard water softening, separation and purification of pharmaceutical and biological products, dye separation, food industry, heavy metal removal, sewage treatment and other fields. [0003] At present, the preparation method of the separation l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D67/00B01D69/10B01D69/02B01D61/00
CPCB01D67/0006B01D67/0002B01D69/02B01D69/10B01D61/027B01D2323/30B01D2325/36
Inventor 秦舒浩陈贵靖秦青青崔振宇靳进波
Owner GUIZHOU MATERIAL IND TECH INSTITUE
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