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A kind of composite film and preparation method thereof

A composite membrane and supporting membrane technology, applied in the field of membrane materials, can solve the problems of easy peeling, poor bonding effect between the intermediate layer and the separation layer, etc., and achieve the effects of improving peeling strength, improving selective separation performance, and increasing bonding force.

Active Publication Date: 2016-06-08
DALIAN EUROFILM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the separation layer material such as polyether copolyamide (PEBA) is hydrophilic, and the middle layer PDMS is an excellent hydrophobic material, there is a phenomenon that the middle layer and the separation layer are not well bonded and easy to peel off.

Method used

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  • A kind of composite film and preparation method thereof
  • A kind of composite film and preparation method thereof
  • A kind of composite film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] (1) Dissolve polyether copolyamide (PEBA) in a mixed solvent of ethanol / water (ethanol:water=7:3) to form a 1wt% PEBA solution, and place it for 24 hours for defoaming;

[0047] (2) After the PAN base film is washed with deionized water, spread it on a glass plate. After wiping off the moisture on the film surface, pour the 50°C PEBA solution in step (1) on the film surface, and shake the glass so that the film surface can be touched. After entering the solution, it was dried vertically in the shade for 10 minutes, and dried in an oven at 70°C for 10 minutes to remove the solvent to obtain a PAN / PEBA (1wt%) composite film.

[0048] Using the above method to test the composite membrane against pure CO 2 and N 2 The permeation performance and separation performance, the results are shown in Table 1.

Embodiment 2

[0050] A PEBA solution at 50° C. was prepared according to the method in Example 1, wherein the concentration of PEBA in the solution was 3 wt%.

[0051] After the PAN base film is washed with deionized water, spread it on a glass plate. After wiping off the moisture on the film surface, pour the prepared PEBA solution on the film surface. Shake the glass so that the film surface can touch the solution and dry it vertically for 10 minutes. , and dried in an oven at 70°C for 10 minutes to remove the solvent to obtain a PAN / PEBA (3wt%) composite film.

[0052] Using the above method to test the composite membrane against pure CO 2 and N 2 The permeation performance and separation performance, the results are shown in Table 1.

Embodiment 3

[0054] A PEBA solution at 50° C. was prepared according to the method in Example 1, wherein the concentration of PEBA in the solution was 2 wt%.

[0055] After the PAN base film is washed with deionized water, spread it on a glass plate. After wiping off the moisture on the film surface, pour the prepared PEBA solution on the film surface. Shake the glass so that the film surface can touch the solution and dry it vertically for 10 minutes. , and dried in an oven at 70°C for 10 minutes to remove the solvent to obtain a PAN / PEBA (2wt%) composite film.

[0056] Using the above method to test the composite membrane against pure CO 2 and N 2 The permeation performance and separation performance, the results are shown in Table 1.

[0057] Table 1.

[0058]

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Abstract

The invention discloses a composite membrane and a preparation method thereof. The composite membrane comprises a porous support membrane, an intermediate layer coated on the porous support membrane, and a separation layer coated on the intermediate layer with selective separation performance. It is characterized in that the material of the intermediate layer includes hydroxyl silicone oil and silicon-containing High polymer, the pore diameter of the porous support membrane is 10-2000nm. The composite membrane of the invention adopts the blend material of hydroxyl silicone oil and silicon-containing high polymer as the middle layer. The addition of hydrophilic hydroxy silicone oil makes the middle layer cortex form uniform hydrophilic points, which increases the affinity with the hydrophilic separation layer, so that the composite membrane not only has high permeability and selective separation performance, but also has high strength and is not easy peel off. The preparation method of the composite membrane of the invention is simple and easy to control, is suitable for the preparation of gas separation, reverse osmosis and nanofiltration composite membranes, and has wide application prospects.

Description

technical field [0001] The invention relates to membrane material technology, in particular to a multilayer composite membrane and a preparation method thereof. Background technique [0002] Membrane technology is an emerging high-tech. Compared with traditional separation technology, it has the advantages of low energy consumption, simple equipment, normal temperature operation, strong adaptability and high reliability. It has been widely used in food, medicine, biology, environmental protection, Chemical industry, metallurgy, energy, petroleum, water treatment, electronics, bionics and other fields. Membrane materials are the basis of a successful membrane separation process, and their permeability and selective separation performance directly restrict the entire membrane separation process. Therefore, high-performance membrane materials and advanced membrane technology have become the focus of membrane science research in various countries. [0003] The preparation of co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D69/12B01D67/00B32B27/08B32B3/24B32B33/00
Inventor 王连军李泰胧季鹏飞王颖李恕广杜国栋栗广勇
Owner DALIAN EUROFILM IND
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