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Preparation method of low-voltage positively-charged nanofiltration membrane and product and application thereof

A technology of positively charged and nanofiltration membranes, which is applied in the field of low-pressure positively charged nanofiltration membranes, can solve the problems of inability to intercept divalent salts, and the effect of positive charging is not obvious, and achieve the effect of improving density and filling gaps

Active Publication Date: 2020-07-17
GUIZHOU MATERIAL IND TECH INSTITUE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, from the reported separation results, the nanofiltration membrane prepared by introducing amine groups can only intercept colored soluble organic matter but not divalent salts, that is, it can only be used to intercept colored soluble organic matter and is called loose nanofiltration membrane. And its effect of positive charge is not obvious

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Embodiment 1: A kind of preparation method of low pressure positively charged nanofiltration membrane:

[0041] S1: In terms of parts by mass, take 17 parts of chlorinated polyvinyl chloride, 3.4 parts of polystyrene / N-phenylmaleimide / epoxy functional group copolymer, and 7 parts of polyethylene glycol (800g / mol) and 72.6 parts of dimethyl sulfoxide, stirred and dissolved in a dissolution tank at 70°C, mixed, and 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. Wash twice, 1 hour each time, fully wash to remove the solvent and porogen, take it out and dry it to obtain a blended polymer ultrafiltration membrane with a thickness of 200 μm and a pore size of 6 nm;

[0042] S2, the polyvinylamine (mol...

Embodiment 2

[0046] Embodiment 2: A kind of preparation method of low pressure positively charged nanofiltration membrane:

[0047] S1: In terms of parts by mass, take 17 parts of chlorinated polyvinyl chloride, 3.4 parts of polystyrene / N-phenylmaleimide / epoxy functional group copolymer, and 7 parts of polyethylene glycol (800g / mol) and 72.6 parts of dimethyl sulfoxide, stirred and dissolved in a dissolution tank at 70°C, mixed, and 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. Wash twice, 1 hour each time, fully wash to remove the solvent and porogen, take it out and dry it to obtain a blended polymer ultrafiltration membrane with a thickness of 200 μm and a pore size of 6 nm;

[0048] S2, the polyvinylamine (mol...

Embodiment 3

[0052] Embodiment 3: A kind of preparation method of low pressure positively charged nanofiltration membrane:

[0053] S1: In terms of parts by mass, take 17 parts of chlorinated polyvinyl chloride, 3.4 parts of polystyrene / N-phenylmaleimide / epoxy functional group copolymer, and 7 parts of polyethylene glycol (800g / mol) and 72.6 parts of dimethyl sulfoxide, stirred and dissolved in a dissolution tank at 70°C, mixed, and 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. Wash twice, 1 hour each time, fully wash to remove the solvent and porogen, take it out and dry it to obtain a blended polymer ultrafiltration membrane with a thickness of 200 μm and a pore size of 6 nm;

[0054] S2, the polyvinylamine (mol...

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Abstract

The invention provides a preparation method of a low-voltage positively-charged nanofiltration membrane, which comprises the following steps: S1, mixing a polymer, a copolymer, a pore-foaming agent and a solvent to obtain a solution, coating the solution on the surface of a non-woven fabric 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 obtained blended polymer ultrafiltration membrane with a polyamine solution to carry out a chemical cross-linking reaction so as to form a loose nanofiltration separation layer, S3, coating the surface of the obtained loose nanofiltration separation layer with a small molecular organic matter solution for a chemical cross-linking reaction, so thata nanofiltration separation layer is formed, and S4, coating the surface of the obtained nanofiltration separation layer with a metal ion solution for a chelation reaction, and carrying out heat treatment after draining to obtain the product. a product and an application thereof are also disclosed. The low-voltage positively-charged nanofiltration membrane is resistant to oxidation, small in thickness, free of falling off in the using process and capable of achieving efficient separation of heavy metal ions, and the hydrophilicity, pollution resistance and permeation flux of the membrane aregood. The preparation method is simple in process and easy 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 method for preparing a low-pressure positively charged nanofiltration membrane, its products and applications. Background technique [0002] Nanofiltration membrane is a pressure-driven membrane between reverse osmosis membrane and ultrafiltration membrane. The pore size is usually about 1nm. Because of the synergy of steric hindrance and Donnan effect, this type of membrane has a unique separation Performance, this type of membrane can efficiently intercept divalent and multivalent salts and organic compounds with a molecular weight of 200-1000 g / mol under lower pressure conditions (compared to reverse osmosis membranes), while the rejection rate of monovalent ions is very low . It has been widely used in the separation and purification of medicine and biological products, separation of dyes, food industry, removal of multivalent ions (such as remov...

Claims

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Application Information

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IPC IPC(8): B01D67/00B01D69/02B01D69/10B01D61/00
CPCB01D67/0079B01D67/0093B01D69/02B01D69/10B01D61/027B01D2325/36B01D2325/16
Inventor 杨园园秦舒浩陈贵靖崔振宇杨敬葵
Owner GUIZHOU MATERIAL IND TECH INSTITUE
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