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Separation membrane and method for producing same

A manufacturing method and a separation membrane technology, applied in the field of separation membranes, can solve the problems of reduced operability of the separation membrane and the like, and achieve the effect of being easy to manufacture

Active Publication Date: 2012-11-14
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Once the two end portions of the substrate 121 occur as Figure 12c The roll-like crimp 124 shown significantly reduces the operability in the separation membrane manufacturing process and the subsequent separation membrane element formation process.

Method used

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  • Separation membrane and method for producing same
  • Separation membrane and method for producing same
  • Separation membrane and method for producing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0096] As the base material, use polyester non-woven fabric (weight per unit area 60g / m 2 , thickness 80μm, width 1000mm). As a material for forming the separation layer, polysulfone (Udel (registered trademark) P-3500 from Solvay Advanced Polymers Co., Ltd.) was used. A polysulfone solution (concentration: 16% by weight, temperature: 20° C.) obtained by dissolving the above polysulfone in dimethylformamide was used as a polymer solution for forming a separation layer. The above-mentioned polymer solution is coated on the surface layer of the above-mentioned non-woven fabric, leaving a certain width at the left and right ends without coating. At this time, a rod coater equipped with a coating bar is arranged on the surface of the nonwoven fabric coated with the polymer solution (see Figure 7 ), the coating rod has a stepped surface provided with a convex portion (large diameter portion) with a height of 50 μm at both ends, and the polymer solution is coated on the surface o...

Embodiment 2

[0108] The separation membrane produced in Example 1 was immersed in a 2% by weight aqueous solution of m-phenylenediamine for 1 minute. After removing excess amine aqueous solution from the surface of the polysulfone membrane forming the separation layer (first separation layer), the aqueous solution was concentrated by drying with a hot air dryer at 80°C for 1 minute. Afterwards, the surface of the polysulfone membrane is coated with a 0.1% by weight n-decane solution of trimesoyl chloride, the surface is completely soaked, and then left to stand for 1 minute to form a polyamide separation layer with a reverse osmosis membrane separation function on the polysulfone membrane. layer (the second separation layer) to produce a separation membrane.

[0109] The left and right ends of the separation layer in the manufactured separation membrane have image 3 the shape shown. Table 1 shows the widths c1 and c2 of the exposed portion of the substrate, the widths b1 and b2 of the t...

Embodiment 3

[0112] In Example 1, the convex portion having the stepped surface on the surface of the coating rod was changed to a convex portion having an inclined surface, and a figure 2 Separation membrane of the shape shown. The results in the above cases are shown in Table 1. The occurrence of curling was not found.

[0113] [Table 1]

[0114]

[0115] The separation membrane of the present invention and its production method can be used for separation membranes used in reverse osmosis membranes, microfiltration membranes, ultrafiltration membranes, and the like and their production. The separation membrane described above can be used in the field of water treatment such as seawater desalination treatment, water purification and wastewater treatment.

[0116] Symbol Description

[0117] 1 substrate

[0118] 1c Part where the separation layer does not exist (substrate exposed part)

[0119] SM, 1SM, 2SM, 3SM, 4SM, 8SM, 9SM, 10SM separation membrane

[0120] 2, 32, 82, 92, 10...

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Abstract

Disclosed is a separation membrane-comprising an elongated substrate having fluid permeability and a separation layer formed at the surface of said substrate-wherein the aforementioned separation layer comprises a predetermined thickness section having a predetermined thickness and thin sections each positioned on the outside of both edges in the widthwise direction of said predetermined thickness portion and having a thinner thickness than the aforementioned predetermined thickness, and there is a separation-layer-lacking section, at which only the aforementioned substrate is present and the aforementioned separation layer is absent, between the outside edges in the widthwise direction of each of said thin sections and the outer edges in the widthwise direction of the aforementioned substrate. The separation membrane can be produced by using coating bar having a protrusion on both the left and right ends of the surface that contacts a macromolecule solution for forming the separation layer.

Description

technical field [0001] The invention relates to separation membranes such as reverse osmosis membranes, microfiltration membranes, and ultrafiltration membranes and their manufacturing methods. Background technique [0002] Separation membranes are used in various fields such as desalination of seawater, water treatment such as water purification and wastewater treatment, medical fields such as blood purification, food industry, battery separators, charged membranes, fuel cells and other electrical fields. The above-mentioned separation membrane is generally composed of a substrate (sheet) and a separation layer having a separation function formed directly thereon, and the substrate (sheet) is composed of a woven or non-woven fabric or the like. For example, JP2007-283287A discloses a separation membrane in which a polyvinylidene fluoride separation layer is formed on a substrate made of polyester nonwoven fabric. In addition, JP2003-245530A and JP09-313905A disclose a sepa...

Claims

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Application Information

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IPC IPC(8): B01D69/10B01D61/02B01D61/14B01D63/10B01D69/00B01D69/12B01D71/16B01D71/34B01D71/56B01D71/68D06M15/256D06M15/333D06M15/59D06M15/63
CPCD06M15/256B01D69/12D06M15/07B01D69/02B01D69/06B01D2325/24B01D2325/04D06M15/63D06M15/59B01D2323/42B01D69/1213B01D67/0013B01D67/0016B01D69/1216B01D2313/23
Inventor 市川龙也秦野贞次郎
Owner TORAY IND INC