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Ultrafiltration membrane and preparation method thereof

A technology of ultrafiltration membrane and filter layer, applied in ultrafiltration, chemical instruments and methods, membranes, etc., can solve the problems of production efficiency decline, easy deformation, easy wrinkling, etc.

Active Publication Date: 2010-05-05
MILLIPORE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Each layer must be produced in a separate manufacturing process, driving up costs and reducing productivity
Producing and handling very thin films, such as less than 20 microns, are difficult due to their tendency to deform and wrinkle easily
This makes it ineffective to make the final product with multiple thin films

Method used

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  • Ultrafiltration membrane and preparation method thereof
  • Ultrafiltration membrane and preparation method thereof
  • Ultrafiltration membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0116] Solutions were prepared in the examples as follows.

[0117] Polyethersulfone (PES) membranes were cast from solutions containing polymer polyethersulfone (PES), Radel A200 resin (Solvay) solvent, N-methylpyrrolidone (NMP) and non-solvent triethylene glycol (TEG). The solution was homogeneous at room temperature but phase separated when heated. The temperature at which a solution begins to phase separate is called the cloud point temperature, which is a function of the solution composition and is extremely sensitive to the concentration of water. It is important to avoid exposing the raw materials, especially TEG, and the final solution to the atmosphere as much as possible. The polymer should be pre-dried eg at 150° C. for 3 hours.

[0118] Mixing is carried out in two steps. First, the polymer was added to a mixture of all NMP and only part of TEG. The portions were mixed while heating to about 50°C to 80°C until the solution was clear. Reduce the temperature to ...

Embodiment 2

[0129] A first polymer solution was prepared by dissolving 22% PES (Radel A200 resin) in 28.1% NMP and 49.9% TEG. The cloud point was measured to be 48.6°C.

[0130] A second polymer solution was prepared by dissolving 14% PES (Radel A200 resin) in 29.2% NMP and 56.8% TEG. An additional 3% of NMP was added to reach a cloud point of 59.3°C.

[0131] The two solutions were co-cast as described in Example 1. The casting thickness of the first solution was adjusted to a final layer thickness of 140 microns. The cast thickness of the second solution was adjusted to a final layer thickness of 13 microns or about 8% of the total film thickness.

[0132] The formation conditions were chosen such that the first solution was quickly exposed to a drum heated to 55°C, above its cloud point, before being immersed in a water bath at 45°C. The results showed that a macroporous-free ultrafiltration layer was formed from the first polymer solution and a thin microporous layer was formed fr...

Embodiment 3

[0136] A first polymer solution was prepared by dissolving 17% PES (Radel A200) in 29.2% NMP and 53.8% TEG. The cloud point can be measured to be 43°C. This will be the bottom or support microporous layer.

[0137] A second polymer solution was prepared by dissolving 21% PES (Radel A200) in 37% NMP and 42% TEG. The cloud point is above 150°C and cannot be measured. This will be the top UF layer.

[0138] The two solutions were co-cast as described in WO 01 / 89673 (Kools). The second solution forms a layer on the first solution. The cast thickness of the first solution was adjusted to a final microporous membrane layer thickness of 160 microns. The cast thickness of the second solution was about 30 microns or about 20% of the total film thickness.

[0139] The forming conditions were chosen such that the layered solution was heated rapidly on the casting drum to within the vicinity of its cloud point before being immersed in a water bath at 55°C. The second solution has n...

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Abstract

The present invention provides a multi-layer ultrafiltration composite membrane which has at least one ultrafiltration layer made by cocoating or sequentially coating a high purity polymer solution onto a support to form a raw membrane sheet, and then the membrane sheet is immerged in coagulation liquid to effect phase separation, thus, a multilayered composite membrane contains at least one ultrafiltration layer can be obtained.

Description

technical field [0001] The present invention provides multilayer composite membranes having at least one ultrafiltration layer prepared from at least two polymer solutions, and a new method of making these membranes. The membrane is especially suitable for use in dead-end ultrafiltration processes. Background technique [0002] Ultrafiltration and microporous membranes are used in pressure-driven filtration processes. Professionals in the field of membrane separation processes can easily distinguish between microporous and ultrafiltration membranes, and usually make a distinction based on their application and the status of their structure. Microporous and ultrafiltration membranes are produced, sold and used as separate and distinct products. Although there is an overlap in name, they are distinct entities, as is the case in the business world. [0003] Ultrafiltration membranes were originally used to concentrate or filter soluble macromolecules such as proteins, DNA, s...

Claims

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Application Information

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IPC IPC(8): B01D69/12B01D61/18A61L2/00A61M1/34B01D63/06B01D67/00B01D69/02
CPCB01D2321/168A61M1/34B01D69/12B01D2321/04B01D69/125A61L2/022B01D71/68B01D2325/04B01D61/145B01D65/02B01D63/067B01D69/02A61L2/0017B01D2325/022B01D67/0016B01D67/0013B01D2321/02A61M2205/3368B01D69/1251B01D69/1213
Inventor 加布里埃尔·特卡奇克菲利普·格达德威廉·弗朗西斯库斯·卡瑟里娜·库斯尼廷·萨塔弗
Owner MILLIPORE CORP
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