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Preparation method of low-pressure polymer decoloration nanofiltration membrane as well as product and application thereof

A polymer and nanofiltration membrane technology, applied in chemical instruments and methods, membranes, membrane technology, etc., can solve problems such as destruction, low carboxyl reactivity, weak non-chemical bonds, etc.

Active Publication Date: 2020-07-24
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 as well as a product and application thereof, and the method comprises the following steps: S1, mixing a polymer, a copolymer, a pore-foaming agent and a solvent to obtain a polymer solution, coating the surface of a non-woven fabric with the polymer solution for forming, and washing to remove the solvent and the pore-foaming agent to obtain a blended polymer ultrafiltration membrane; S2, coating the surface of the blended polymer ultrafiltration membrane obtained in the step S1 with apolyamine solution to carry out a cross-linking reaction so as to form a nanofiltration separation layer; and S3, carrying out heat treatment on the ultrafiltration membrane obtained in the step S2 to obtain the product. Articles and uses thereof are also disclosed. The low-pressure polymer decoloration nanofiltration membrane is resistant to oxidation and small in thickness, the separation layerdoes not fall off in the using process, multivalent ions and colored soluble organic matters can be efficiently separated, and the hydrophilicity, pollution resistance and permeation flux of the membrane are good; besides, the preparation method of the nanofiltration membrane is simple in process, can be used for large-scale production, and has a good industrial application prospect.

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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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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