Selective-permeability membrane and method for manufacturing same

A manufacturing method and permeable membrane technology, applied in semipermeable membrane separation, chemical instruments and methods, membranes, etc., can solve the problems of easy peeling and damage, high fluidity, etc.

Active Publication Date: 2017-09-26
KURITA WATER INDUSTRIES LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] In the case where the phospholipid bilayer membrane covering the main body of the membrane is formed only by phospholipids whose phase transition temperature is lower than that of the water to be treated, the entire phospholipid bilayer becomes a liquid crystal phase at the time of water treatment, and it is easy because of its high fluidity. peeling and damage

Method used

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  • Selective-permeability membrane and method for manufacturing same
  • Selective-permeability membrane and method for manufacturing same
  • Selective-permeability membrane and method for manufacturing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0054] Hereinafter, examples and comparative examples will be described. Materials used, evaluation methods, etc. will be described.

[0055] [film body]

[0056] In the following examples and comparative examples, a film such as anodized aluminum oxide (Anodisc manufactured by Whatman Co., Ltd., diameter 25 mm, pore diameter 20 nm) was used as the main body of the film.

[0057] [phospholipids]

[0058] 1-palmitoyl-2-oleoyl-sn-glyceroyl-3-phosphatidylcholine (POPC, phase transition temperature -2°C, manufactured by NOF Corporation) was used as the first phospholipid containing unsaturated fatty acid in the acyl group .

[0059] 1,2-dipalmitoyl-sn-glyceroyl-3-phosphatidylcholine (DPPC, phase transition temperature 41°C, manufactured by NOF Corporation) was used as the second phospholipid, and in the second phospholipid, the two acyl groups consisted of Saturated fatty acids with 16 carbon atoms.

[0060] [channel substance]

[0061] Gramicidin A (GA, manufactured by Sigm...

reference example 1

[0076] Phospholipids were dissolved in chloroform to prepare a POPC solution. The organic solvent was evaporated under reduced pressure, pure water was added to the dry lipid film remaining in the container, and the film was hydrated at 35°C to prepare a vesicle dispersion. The obtained vesicle dispersion was dipped alternately and repeatedly in liquid nitrogen and a water bath at 35° C. for 5 times by using the freeze-thaw method, so as to grow the particles. Using a polycarbonate track-etched membrane with a pore size of 0.1 μm, the vesicle dispersion was extruded, granulated, and diluted with pure water so that the lipid concentration was 0.4 mM.

[0077] The membrane body treated with the silane coupling agent was immersed in the vesicle dispersion for 2 hours to adsorb the phospholipid to the membrane body. Thereafter, ultrasonic cleaning was performed for 10 minutes to peel off excess phospholipids adsorbed on the main body of the film, thereby producing a POPC coating ...

reference example 2

[0079] Except having used DPPC instead of POPC as a phospholipid, it carried out similarly to Reference Example 1, the DPPC covering film was produced, and the salt leakage rate was measured.

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Abstract

The present invention provides: a selective-permeability membrane which has a coating layer composed of a phospholipid double membrane, the coating layer enduring the pressure applied during water treatment and not detaching; and a method for manufacturing the same. Provided is a selective-permeability membrane that has a membrane body having selective permeability and a coating layer that is formed on a surface of the membrane body and that is composed of a phospholipid double membrane containing a channel material. The selective-permeability membrane is characterized in that the phospholipid double membrane contains, as the phospholipid, a first phospholipid containing an unsaturated fatty acid in an acyl group and a second phospholipid in which two acyl groups comprise a saturated fatty acid with a carbon number of 16-24.

Description

technical field [0001] The invention relates to a selectively permeable membrane used in the field of water treatment and a manufacturing method thereof, in particular to a selectively permeable membrane with a covering layer composed of a phospholipid bilayer membrane and a manufacturing method thereof. Background technique [0002] Reverse osmosis (RO) membranes are widely used as selective permeable membranes in the fields of desalination of seawater and alkaline water, production of industrial water and ultrapure water, and waste water recovery. RO membrane treatment has the advantage of highly removing ions and low molecular organic matter. Compared with microfiltration (MF) membrane and ultrafiltration (UF) membrane, high operating pressure is required. In order to improve the water permeability of RO membranes, for polyamide RO membranes, efforts have been made to control the wrinkle structure of the skin layer and increase the surface area. [0003] RO membranes ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/06B01D69/00B01D69/12C02F1/44
CPCB01D69/12B01D71/06C02F1/44B01D61/025B01D61/027B01D61/145B01D61/147B01D67/0093B01D69/02B01D2325/24B01D67/0088B01D71/025B01D2321/281B01D2323/218
Inventor 藤井昭宏川胜孝博松山秀人佐伯大辅迫郁弥
Owner KURITA WATER INDUSTRIES LTD
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