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Method for preparing hydrophilic pollution-resistant composite ultrafiltration membrane by semi-interpenetrating network method

A semi-interpenetrating network, hydrophilic technology, used in semi-permeable membrane separation, chemical instruments and methods, osmotic/dialysis water/sewage treatment, etc., to achieve strong hydrophilicity, high pure water flux, and enhanced mechanical strength Effect

Active Publication Date: 2014-12-31
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There have been reports on the preparation of high-performance proton exchange membranes using the semi-interpenetrating network method (Chinese patents CN200810041474.5 and CN200910048260.5), but the application in the preparation of hydrophilic and anti-fouling composite ultrafiltration membranes driven by pressure has not been reported. rarely reported

Method used

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  • Method for preparing hydrophilic pollution-resistant composite ultrafiltration membrane by semi-interpenetrating network method
  • Method for preparing hydrophilic pollution-resistant composite ultrafiltration membrane by semi-interpenetrating network method
  • Method for preparing hydrophilic pollution-resistant composite ultrafiltration membrane by semi-interpenetrating network method

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preparation example Construction

[0062] (2) In the preparation method of the ultrafiltration composite membrane of the present invention, a cross-linking agent is used to pretreat the base film that acts as a support layer, which reduces the surface energy of the base film, enables coating and cross-linking to be carried out simultaneously, and increases the support. The bonding fastness between the base film of the multi-layer effect and the casting film coating material makes the composite layer firm and not easy to fall off;

[0063] (3) The present invention uses one of polyethersulfone, polysulfone, phthalazine polyethersulfone ketone and polyvinylidene fluoride to combine with hydrophilic polymers containing hydroxyl groups (polyvinyl alcohol, cellulose or chitosan) Blending as a membrane-making material, on the one hand, maintains the excellent properties of the original polyethersulfone, polysulfone, phthalazine polyethersulfone ketone and polyvinylidene fluoride, and on the other hand, due to the hydr...

Embodiment 1

[0067] Dissolve 18g of polyethersulfone and 9g of polyvinylpyrrolidone after drying into 61g of N-methylpyrrolidone organic solvent, and stir at 70°C until the polymer is completely dissolved.

[0068] Continue to add 7g lithium chloride and 5g cellulose to the mixed solution under stirring condition, make it fully swell and dissolve,

[0069] Add 7g of glutaraldehyde for cross-linking reaction for 12 hours, stand still and filter to remove impurities, and then vacuumize and defoam to prepare the casting solution.

[0070] The base film polyester non-woven fabric is pretreated by soaking in glutaraldehyde solution for at least 24 hours,

[0071] Install the polyester non-woven fabric that has been pretreated and dried on the film scraping machine, adjust the speed of the non-woven fabric to 1.2m / s, and the thickness between the scraper and the base film is 160μm to scrape the film. After running in the air, immerse in coagulation bath water at 25°C to form a film, soak the sc...

Embodiment 2

[0073] Dissolve 12g of polysulfone, 8g of polyethylene glycol, and 2g of formic acid into 74g of N,N-dimethylacetamide organic solvent after drying, and stir at 60°C until the polymer is completely dissolved.

[0074] Continue to add 1g of lithium chloride and 3g of polyvinyl alcohol to the mixed solution under stirring conditions to fully swell and dissolve it,

[0075] Add 1 g of polyethylene glycol bisglycidyl ether for cross-linking reaction for 6 hours, stand still and filter to remove impurities, and then vacuumize and defoam to prepare the casting solution.

[0076] The base film polyester non-woven fabric is pretreated by soaking in polyethylene glycol bisglycidyl ether solution for at least 24 hours,

[0077] Install the pretreated polyester non-woven fabric on the film scraping machine, adjust the speed of the non-woven fabric to 1.5m / s, and the thickness between the scraper and the base film is 150μm to scrape the film. The primary composite film is After running i...

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Abstract

The invention relates to a method for preparing a hydrophilic pollution-resistant composite ultrafiltration membrane by a semi-interpenetrating network method; a dried membrane material and an additive are added into an organic solvent, and stirred to dissolve to form a mixed solution; lithium chloride is added into the mixed solution, a hydrophilic polymer containing hydroxyl groups is also added for full swelling and dissolving, a crosslinking agent is added for crosslinking reaction, after the crosslinking reaction is completed, impurities are removed by filtering, a membrane casting solution is obtained by vacuum deaeration; a basement membrane is soaked with the crosslinking agent for pretreatment, the pretreated basement membrane is fixed on a membrane blade, the surface of the basement membrane is coated with the membrane casting solution, the basement membrane coated with the membrane casting solution is dipped into a coagulating bath for membrane formation to obtain a flat ultrafiltration composite membrane with a semi-interpenetrating network structure. The ultrafiltration membrane prepared by the method has good hydrophilicity and mechanical properties, high mechanical strength, pollution resistance and high pure water flux, and can reduce the cost of sewage treatment, and the preparation method is suitable for industrialized production.

Description

technical field [0001] The invention relates to a method for manufacturing a polymer membrane used for sewage reuse in the fields of material science and environmental protection, in particular to a method for preparing a hydrophilic anti-pollution composite ultrafiltration membrane by using a semi-interpenetrating network method. It belongs to the preparation technology of flat ultrafiltration composite membrane. Background technique [0002] The membrane separation process is a new field resulting from the cross-combination and mutual penetration of many disciplines such as material science and process engineering science. The ultrafiltration membrane separation process has the characteristics of simple operation, easy to realize large-scale continuous separation and automatic control, etc. Treatment and regeneration of water resources have been widely used. The ultrafiltration membrane separation process can also be applied to the separation, purification and concentratio...

Claims

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Application Information

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IPC IPC(8): B01D71/68B01D71/34B01D69/12B01D69/06B01D67/00C02F1/44
Inventor 杨丽魏昕奚振宇
Owner CHINA PETROLEUM & CHEM CORP
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