Preparation method of crosslinking nanofiltration membrane

A technology of nanofiltration membrane and mass ratio, which is applied in the field of preparation of cross-linked nanofiltration membrane, which can solve the problems of not being able to meet the requirements of hydrophilicity, chemical solvent resistance, temperature resistance, difficult processing, and difficult recycling at the same time

Inactive Publication Date: 2015-03-25
华玉叶
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The mixed solvent is difficult to recycle after the polymer film is formed, and it is difficult to handle
In addition to the deficiencies in the film-making process, these polymer

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] First, the phenolic resin and tetraethylenetriamine are completely dissolved in the medium according to a certain mass ratio. The mass ratio of phenolic resin to tetraethylenetriamine is 2:5; the mass ratio of phenolic resin to medium is 8-10:2-3; Stir uniformly to obtain a clear solution. The medium is composed of polyethylene glycol and surfactant OP-10. The mass ratio of polyethylene glycol to OP-10 is 4-8: 2-3. The bubbles are removed and the crosslinking agent formaldehyde solution is added. Continue to stir, keep the temperature at 60~80℃ in the drying box for 1-24 hours; stir at the speed of 1000-3000r / min for 2-4 minutes, and then get the casting liquid; use the casting method to coat the formed casting liquid Covered on a glass slide, after vacuum drying at 60-80°C, take it out and soak in ether solution for 2-4 hours to remove the medium polyethylene glycol and surfactant OP-10, and finally wash it with ethanol and distilled water several times and dry to obtain...

Embodiment 2

[0012] First, the phenolic resin and tetraethylenetriamine are completely dissolved in the medium according to a certain mass ratio. The mass ratio of phenolic resin to tetraethylenetriamine is 3:5; the mass ratio of phenolic resin to medium is 8-10:2-3; Stir evenly to obtain a clear solution. The medium is composed of polyethylene glycol and surfactant OP-10. The mass ratio of polyethylene glycol to OP-10 is 4-8:2-3. Degas bubbles and add crosslinking agent formaldehyde solution. Continue to stir, keep the temperature at 60~80℃ in the drying box for 1-24 hours; stir at the speed of 1000-3000r / min for 2-4 minutes to obtain the casting liquid; use the casting method to coat the resulting casting liquid Covered on a glass slide, after vacuum drying at 60-80°C, take it out and soak in ether solution for 2-4 hours to remove the medium polyethylene glycol and surfactant OP-10, and finally wash it with ethanol and distilled water several times and dry to obtain cross-linked sodium Fi...

Embodiment 3

[0014] First, the phenolic resin and tetraethylenetriamine are completely dissolved in the medium according to a certain mass ratio. The mass ratio of phenolic resin to tetraethylenetriamine is 2-3:5-6; the mass ratio of phenolic resin to medium is 8:3; Stir evenly to obtain a clear solution. The medium is composed of polyethylene glycol and surfactant OP-10. The mass ratio of polyethylene glycol to OP-10 is 4-8:2-3. Degas bubbles and add crosslinking agent formaldehyde solution. Continue to stir, keep the temperature at 60~80℃ in the drying box for 1-24 hours; stir at the speed of 1000-3000r / min for 2-4 minutes, and then get the casting liquid; use the casting method to coat the formed casting liquid Covered on a glass slide, after vacuum drying at 60-80℃, take it out and soak in ether solution for 2-4 hours to remove the medium polyethylene glycol and surfactant OP-10, and finally wash it with ethanol and distilled water several times and dry to obtain cross-linked sodium Fil...

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PUM

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Abstract

The invention discloses a preparation method of a crosslinking nanofiltration membrane. The method comprises the steps of completely dissolving phenolic resin and tetraethenyl triamine in a certain mass ratio through a medium, wherein the mass ratio of phenolic resin to tetraethenyl triamine is (2-3):(5-6), and the mass ratio of phenolic resin to the medium is (8-10):(2-3); uniformly agitating to obtain a settled solution, wherein the medium is prepared from polyethylene glycol and a surface active agent OP-10 in the mass ratio of (4-8):(2-3); removing bubbles; adding a crosslinking agent, namely, a formaldehyde solution; continuously agitating; preserving heat for 1 to 24 hours at the temperature of 60 to 80 DEG C in a drying tank; agitating for 2 to 4 minutes at the rotating speed of 1,000 to 3,000r/min to obtain a casting membrane solution; coating a glass sheet with the generated casting membrane solution by a film casting method; drying under a vacuum condition at the temperature of 60 to 80 DEG C; soaking for 2 to 4 hours through a diethyl ether solution to remove the medium, namely, polyethylene glycol and the surface active agent OP-10; washing with alcohol and distilled water for a plurality of times; and then drying to obtain the crosslinking nanofiltration membrane. The method is performed under mild preparation conditions, does not have strict requirements, is convenient to operate, enables simple forming, and meets the demand on mass production; the prepared nanofiltration membrane is of a symmetric structure, and is uniform in pore size distribution, adjustable in pore size, and outstanding in repeatability.

Description

Technical field [0001] The invention relates to a preparation method of a cross-linked nanofiltration membrane. Background technique [0002] Nanofiltration membranes have two characteristics: 1) the separation performance of different organic components, the molecular weight cut-off (MWCO) range is about 200-2000; 2) the surface charge of the membrane is different from the Donnan of the same charge and different valence ions. The potential is not the same. The unique performance of nanofiltration membrane determines its scope of application, and it is suitable for the separation of substances in the following situations: 1) The rejection rate of monovalent ions is not high or not required; 2) The separation of ions with different valence states is required. 3) The rejection rate of low molecular weight organics is not high or not required; 4) High molecular weight organics and low molecular weight organics need to be separated. 5) Specific substances such as dyes, etc., and sp...

Claims

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Application Information

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IPC IPC(8): B01D71/72B01D67/00
Inventor 华玉叶
Owner 华玉叶
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