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Membrane casting agent and preparation method thereof

A casting film, uniform technology, applied in the direction of chemical instruments and methods, membrane, membrane technology, etc., can solve the problems of decreased membrane flux and separation efficiency, easy to cause organic pollution, large damage to membrane strength, etc., to improve hydrophilicity , enhance the degree of bonding, improve the effect of mechanical properties

Active Publication Date: 2018-12-28
HEBEI ZHONGQUAN ENVIRONMENT PROTECTION TECHCO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, polyethersulfone is a weakly polar material with strong hydrophobicity, and there are two major problems when it is used in the treatment of aqueous media: the first is that the hydrophobicity of the membrane surface requires it to work under higher pressure , so the power consumption is large, and the strength of the membrane is also greatly damaged; the second is that the hydrophobicity of the membrane surface is easy to cause organic pollution. In the case of long-term adsorption and pollution of organic substances, the flux and separation efficiency of the membrane will drop significantly.

Method used

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  • Membrane casting agent and preparation method thereof
  • Membrane casting agent and preparation method thereof
  • Membrane casting agent and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Mix and stir 10g cinnamic acid and 10g polyethyleneimine, stir for 1h to obtain a hydrophilic modification solution, mix 15g polyethersulfone and 5g hydrophilic modification solution respectively, heat to 70°C, stir for 1h to obtain a solute solution, and then Add 0.5g of photoinitiator 910, 1g of trimethylolpropane trimethacrylate, 1g of polyvinylpyrrolidone, 1g of citric acid and 0.2g of ethylene glycol, mix and heat to 80°C, stir for 1h to obtain a mixed solution, mix The solution was decompressed and left to defoam, the decompression vacuum degree was 0.1Mpa, and the decompression was 30min. After the decompression was completed, the mixed solution was irradiated under an ultraviolet light for 2min to obtain a film-casting agent, which was used to prepare an ultrafiltration membrane. And the ultrafiltration membrane performance test.

Embodiment 2

[0026] Mix and stir 10g cinnamic acid and 50g polyethyleneimine, stir for 2 hours to obtain a hydrophilic modification solution, mix 35g polyethersulfone and 15g hydrophilic modification solution respectively, heat to 80°C, stir for 2 hours to obtain a solute solution, and then Add 5g of photoinitiator 1173, 1g of pentaerythritol tetraacrylate, 1g of polyvinylpyrrolidone, 1g of salicylic acid and 1g of polyethylene glycol, mix and heat to 80°C, and stir for 2 hours to obtain a mixed solution, which is left to stand under reduced pressure to remove Bubble, decompression vacuum degree is 0.1Mpa, decompression 60min, after decompression is completed, the mixed solution is placed in the ultraviolet lamp irradiation 5min, obtains the film-casting agent, utilizes the film-casting agent to prepare ultrafiltration membrane, and ultrafiltration membrane is carried out Performance testing.

Embodiment 3

[0028] Mix and stir 10g cinnamic acid and 100g polyethyleneimine, stir for 1.5h to obtain a hydrophilic modification solution, mix 25g polyethersulfone and 10g hydrophilic modification solution respectively, heat to 70°C, and stir for 1.5h to obtain a solute solution , then add 3g of photoinitiator 184, 2g of ethylene glycol dimethacrylate, 2g of polyvinylpyrrolidone, 2g of acetic acid and 0.1g of glycerin, mix and heat to 80°C, stir for 1.5h to obtain a mixed solution, and depressurize the mixed solution Leave standstill to defoam, the decompression vacuum degree is 0.1Mpa, decompression 40min, decompression is completed, the mixed solution is placed in ultraviolet light and irradiates 4min, obtains the film-casting agent, utilizes the film-casting agent to prepare ultrafiltration membrane, and to ultrafiltration Filter performance testing.

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Abstract

The invention provides a membrane casting agent and a preparation method thereof. The method comprises the steps as follows: mixing polyether sulfone and a hydrophilic modified solution to obtain a mixed solute, dissolving the solute in a solvent, performing heating and stirring to obtain a solution, adding an additive and a photoinitiator to the solution, and using ultraviolet lamp irradiation for initiation to enable raw materials in the polyether sulfone membrane casting agent solution to interact in advance. On one hand, the hydrophilic property of the membrane casting agent is effectivelyimproved due to addition of the additive, and on the other hand, an ultrafiltration membrane material prepared from the membrane casting agent has higher mechanical performance and service life by use of the photoinitiator and ultraviolet lamp irradiation. The ultrafiltration membrane material prepared from the membrane casting agent has good hydrophilic performance and excellent mechanical performance.

Description

technical field [0001] The invention relates to the technical field of polymer separation membranes, in particular to a membrane-casting agent and a preparation method thereof. Background technique [0002] As a pressure-driven membrane separation technology, ultrafiltration technology has the advantages of normal temperature operation, low energy consumption, and high separation efficiency. It has been widely used in drinking water purification, petrochemical, biomedicine, food, metallurgy and other industries. application. [0003] Polyethersulfone molecule is a kind of polymer connected by sulfone group, ether bond and benzene ring. It has excellent oxidation resistance and stability. The ether bond improves the toughness of polyethersulfone, and the benzene ring improves the polymer. Excellent mechanical strength, all bonds in the molecule are not easily hydrolyzed. The polymer has a glass transition temperature of 225°C, has excellent physical and mechanical propertie...

Claims

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Application Information

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IPC IPC(8): B01D61/14B01D71/68B01D67/00
CPCB01D61/145B01D67/0006B01D71/68B01D2325/36
Inventor 陈泉学
Owner HEBEI ZHONGQUAN ENVIRONMENT PROTECTION TECHCO LTD
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