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Method for improving polyisophthaloyl metaphenylene diamine hollow fiber nanofiltration membrane hydrophilism and pollution resistant performance

A technology of polym-phenylene isophthalamide and nanofiltration membrane, which is applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., to achieve excellent mechanical properties

Inactive Publication Date: 2013-06-05
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are many patents related to the modification of aromatic polyamide polymers to prepare membranes, but based on polym-phenylene isophthalamide as membrane material, hollow fiber nanofiltration membranes are prepared by adding nano-titanium dioxide particles to improve membrane performance. Hydrophilic pollution resistance technology has not been reported

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Weigh 180g of fully dried polym-phenylene isophthalamide, 750g of dimethylacetamide, and 52g of anhydrous lithium chloride, mix them in the hollow fiber membrane spinning machine feed tank, and set the dissolution temperature to 85 ℃, after the polymer is completely dissolved, add 18g of nano-titanium dioxide particles, stir well, so that the nanoparticles are evenly dispersed in the membrane-forming solution. Then vacuum defoaming is carried out at 50°C, and then the hollow fiber nanofiltration membrane is drawn. The length of the drying tunnel is set to be 20cm, the temperature of the drying tunnel is 100°C, the core liquid and the gel bath are deionized water at 25°C, the elongation at break of the obtained hollow fiber nanofiltration membrane is 112%, and the tensile strength is 10.87%. MPa; contact angle 37.1°.

Embodiment 2

[0020] Weigh 200g of completely dry polym-phenylene isophthalamide, 670g of dimethylacetamide, 50g of anhydrous lithium chloride, and 60g of polyvinylpyrrolidone and mix them in the hollow fiber membrane spinning machine feed tank, set The dissolution temperature was 85°C. After the polymer was completely dissolved, 28g of nano-titanium dioxide particles were added and stirred thoroughly so that the nanoparticles were uniformly dispersed in the film-forming solution. Then vacuum defoaming is carried out at 50°C, and then the hollow fiber nanofiltration membrane is drawn. The length of the drying tunnel is set to be 10cm, the temperature of the drying tunnel is 120°C, the core liquid and the gel bath are deionized water at 25°C, the elongation at break of the obtained hollow fiber nanofiltration membrane is 96%, and the tensile strength is 12.05%. MPa; contact angle 26.2°.

Embodiment 3

[0022] Take by weighing 220g completely dry polym-phenylene isophthalamide, 650g dimethylacetamide, 53g anhydrous lithium chloride, 46g polyethylene glycol and mix in hollow fiber membrane spinning machine feed tank, set Set the dissolution temperature at 85°C. After the polymer is completely dissolved, add 32g of nano-titanium dioxide particles and stir thoroughly to make the nanoparticles evenly dispersed in the film-forming solution. Then vacuum defoaming is carried out at 50°C, and then the hollow fiber nanofiltration membrane is drawn. The length of the drying tunnel is set to be 10cm, the temperature of the drying tunnel is 120°C, the core liquid and the gel bath are deionized water at 25°C, the elongation at break of the obtained hollow fiber nanofiltration membrane is 91%, and the tensile strength is 12.50 MPa; contact angle 21.2°.

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Abstract

The invention relates to a method for improving polyisophthaloyl metaphenylene diamine hollow fiber nanofiltration membrane hydrophilism and pollution resistant performance. Polyisophthaloyl metaphenylene diamine is used as raw materials, after fully mixing and dissolving with organic dissolvant and pore-foaming agent, nanometer titania particles are increased, fully blended and uniformly distributed, after standing vacuum defoaming, and the hollow fiber nanofiltration membrane is manufactured by adopting an immersion sediment phase inversion method in a pulling mode. The content of the polyisophthaloyl metaphenylene diamine in membrane-manufacturing original liquid is 10%-25wt.%, the content of the organic dissolvant is 50%-70wt.%, the content of the pore-foaming agent is 5%- 25wt.%, and the content of nanometer titania particles is 0.5%- 4wt.%. The prepared hollow fiber nanofiltration membrane contact angle is lowered from 70 degrees to 40 degrees, in the meantime possesses good mechanical property. Tensile strength can meet 10.0 Mpa-18.0 Mpa, and an elongation at break is in the range of 80%-150%. The method for improving polyisophthaloyl metaphenylene diamine hollow fiber nanofiltration membrane hydrophilism and pollution resistant performance has the advantages of being simple in operation, capable of reserving the original good features of the polyisophthaloyl metaphenylene diamine hollow fiber nanofiltration membrane, and further enhancing the hydrophilism of surfaces of membranes, improving the anti-pollution performance of the membranes and wide in application prospect.

Description

technical field [0001] The invention relates to a preparation technology of a hollow fiber nanofiltration membrane, in particular to a method for improving the hydrophilic pollution resistance performance of the nanofiltration membrane by adding nano-titanium dioxide particles. Background technique [0002] Membrane separation technology is an emerging processing technology. Compared with traditional separation technology, it has the advantages of high separation efficiency, no pollution to the environment, and easy integration with other technologies. It has been widely used in petrochemical, electronics, pharmaceutical, food, etc. , biochemistry, environment, seawater desalination and other fields. And it develops at an annual rate of 14% to 30%, effectively driving the scientific and technological progress of other related industries. As one of membrane separation technologies, nanofiltration membrane separation technology is a new separation technology between ultrafilt...

Claims

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Application Information

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IPC IPC(8): B01D71/56B01D69/08B01D69/02B01D67/00
Inventor 赵长伟王涛栾兆坤张健贾智萍王军侯得印
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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