Preparation method and application of separation film with nano composite cortical layer

A composite skin, separation membrane technology, applied in semi-permeable membrane separation, chemical instruments and methods, membrane technology and other directions, can solve the problems of membrane water flux and other performance degradation, to overcome the lack of mechanical strength, good flux and Retention performance, the effect of broadening the range of materials

Active Publication Date: 2013-02-06
VONTRON TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention discloses a preparation method and application of a separation membrane with a nano-composite skin layer, and proposes a preparation method of a novel nano-composite ultrafiltration membrane, which solves the problem of nanoparticles being directly dispersed in the entire separation membrane in the prior art. Problems that cause performance degradation such as membrane water flux

Method used

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  • Preparation method and application of separation film with nano composite cortical layer

Examples

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Comparison scheme
Effect test

Embodiment 1

[0028] Dissolve 500g of silica nanoparticles (particle size 5nm) in 2200g of N,N-dimethylpyrrolidone, stir and disperse evenly, then add 500g of polysulfone, the dissolution temperature is 80°C, and the dissolution time is 8h, and the dissolved solution is placed in a vacuum oven Stand at 40°C for degassing, the degassing time is 7 hours, and the solution after degassing is evenly applied to the upper and lower layers of the non-woven fabric substrate at the same time using the upper layer coating die head, the coating speed is 10m / min, and the coating thickness is the upper layer 0.5 μm, lower layer 20 μm. The coating solution layer was coagulated in deionized water at a coagulation bath temperature of 25°C. After coagulation, the obtained ultrafiltration membrane was rinsed in deionized water to remove residual solvent and stored in deionized water.

Embodiment 2

[0030] First, disperse 54g of titanium dioxide nanoparticles (particle size 60nm) in 2646g of dimethylacetamide, stir and disperse evenly, add 500g of polycarbonate, stir and dissolve, the dissolution temperature is 80°C, the dissolution time is 8h, and the dissolved solution is placed in a vacuum Stand in an oven at 40°C for defoaming, and the defoaming time is 7 hours. After defoaming, the solution is evenly applied to the upper and lower layers of the non-woven fabric substrate at the same time using the upper coating die head. The coating speed is 10m / min, and the coating thickness is The upper layer is 5 μm, and the lower layer is 50 μm. The coating solution layer was coagulated in deionized water at a coagulation bath temperature of 25°C. After coagulation, the obtained ultrafiltration membrane was rinsed in deionized water to remove residual solvent and stored in deionized water.

Embodiment 3

[0032] Dissolve 500g of polyethersulfone in 2200g of chloroform, the dissolution temperature is 80°C, and the dissolution time is 8h. The dissolved solution is placed in a vacuum oven at 40°C for defoaming, and the defoaming time is 7h. Polymer solution A in the bulk layer.

[0033] Disperse 54g of zinc oxide nanoparticles (particle size 100nm) in 2646g of chloroform, stir and disperse evenly, add 500g of polyethersulfone, stir and dissolve, the dissolution temperature is 80°C, and the dissolution time is 8h, and the dissolved solution is placed in a vacuum oven Stand at 40° C. for defoaming for 7 hours to prepare polymer solution B for the nanocomposite skin layer.

[0034] The above solutions A and B are uniformly applied on the non-woven fabric substrate at the same time using a double-layer coating die head, the coating speed is 10m / min, the coating thickness of the lower layer (body layer) is 100 μm, and the coating thickness of the upper layer (skin layer) is 10 μm. The...

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Abstract

The invention provides a preparation method and application of a separation film with a nano composite cortical layer. The separation film comprises a non-woven fabric layer, two porous support layers and a desalination layer, and is characterized in that the lower layer of the two porous support layers is a porous body layer containing polymers and/or nano particles, and the upper layer of the two porous support layers is a porous cortical containing polymers and nano particles. The preparation method includes coating the upper layer and the lower layer of the non-woven base material by means of a double-layer coating technology. An ultrafilter support layer of the composite separation film prepared by the preparation method is good in surface evenness, hight water flux is kept in the meantime of keeping higher cutoff rate, and the separation film can be directly used as an ultrafiltration film or can be used as a basic porous support layer to further prepare a composite forward osmosis, reverse osmosis and nanofiltration film. The preparation method can be applied to preparing the reverse osmosis film and the nanofiltration film which are good in performance, and a composite ultrafiltration film with low molecular weight cutoff.

Description

technical field [0001] The invention relates to a preparation method and application of a separation membrane with a nanocomposite skin layer, and belongs to the field of separation membrane materials / water treatment. Background technique [0002] Membrane separation technology, as a new and efficient fluid separation unit operation technology, has achieved remarkable rapid development in recent years. At present, there are more than 100 institutes and universities engaged in the research of separation membranes, more than 300 membrane product manufacturers, and nearly 1,000 engineering companies. They have carried out work in almost all fields of separation membranes, and the production scale of products involves reverse osmosis. , nanofiltration, ultrafiltration, microfiltration, electrodialysis and other unit operations or integrated membrane water treatment systems, membrane separation of gas mixtures, pervaporation membrane processes for liquid mixture separation, and m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D67/00B01D71/06
Inventor 梁松苗吴宗策许国扬陶健蔡志奇金焱
Owner VONTRON TECH CO LTD
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