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Slab separating membrane and preparation method thereof

A technology for separating membrane and flat plate, which is applied in the field of membrane separation and can solve problems such as filtration resistance

Active Publication Date: 2017-01-04
中科瑞阳膜技术(北京)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The inventor solved the above-mentioned problem of filtration resistance by adjusting the scraping process so that the casting solution partially permeated through the non-woven fabric

Method used

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  • Slab separating membrane and preparation method thereof
  • Slab separating membrane and preparation method thereof
  • Slab separating membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0092] In this example, an ultrafiltration membrane with a molecular weight cut off of 5KD was prepared.

[0093] Using a film coating machine, the casting solution containing 28wt% polyethersulfone, 65wt% formamide and 7wt% polyethylene glycol 600 was stirred at 60°C for 5 hours, and then placed at room temperature for 72 hours. Remove the air bubbles.

[0094] Under the action of the film coating machine, the casting solution is coated on a polypropylene and polyethylene polymer non-woven fabric with a thickness of about 0.12 mm (purchased from Freudenberg Baoling Non-woven Fabric (Suzhou) Co., Ltd., model : 2470) on one side a, the other side b of the non-woven fabric is pasted with a peelable film, the thickness of the film is 0.15 mm, and hollow areas are distributed on the film (or the side of the film in contact with the non-woven fabric) spaced with recessed areas). The coating speed is 5 meters per minute, and the coating thickness of the casting solution on the non...

Embodiment 2

[0102] The present embodiment is an ultrafiltration membrane with a molecular weight cut off of 50KD.

[0103] Using a film coating machine, the casting solution containing 21wt% polyacrylonitrile, 59wt% formamide and 20wt% polyvinylpyrrolidone was stirred at 50°C for 5 hours, and then placed at room temperature for 72 hours to remove it. bubble.

[0104] Under the action of the film coating machine, the casting solution is coated on one side a of a polyester (purchased from Teijin Co., Ltd., model: E55080-60) non-woven fabric with a thickness of about 0.08mm, and the other side of the non-woven fabric b is pasted with a peelable film, the thickness of which is 0.2 mm, and hollow areas are distributed on the film at intervals (or recessed areas are distributed at intervals on the side of the film in contact with the non-woven fabric). The film coating speed is 12 meters per minute, and the film thickness is controlled to be about 0.15mm.

[0105] The residence time before en...

Embodiment 3

[0110] In this example, an ultrafiltration membrane with a molecular weight cut off of 100KD was prepared.

[0111] Using a coating machine, the casting solution containing 18wt% cellulose acetate, 36wt% dioxane, 40wt% formamide and 6wt% lithium chloride was stirred at 50°C for 5 hours, and then placed in a normal temperature environment Place it for 72 hours to remove the air bubbles.

[0112] Under the action of the coating machine, the casting solution is coated on one side a of a polyester non-woven fabric with a thickness of 0.15 mm (purchased from Awa Paper Co., Ltd., model: 150), and the other side b of the non-woven fabric A peelable film is pasted, the thickness of the film is 0.3mm, and hollow areas are distributed on the film at intervals (or recessed areas are distributed at intervals on the side of the film in contact with the non-woven fabric). The coating speed is 5 meters per minute, and the thickness of the coating film is controlled to be about 0.26mm.

[0...

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Abstract

The invention relates to a slab separating membrane and a preparation method thereof. The slab separating membrane comprises a high-molecular material and a non-woven fabric, and is characterized in that a high-molecular membrane is formed on one surface of the non-woven fabric; the high-molecular material penetrates into the non-woven fabric and locally permeates into the non-woven fabric; bulges distributed at intervals are formed on the other surface of the non-woven fabric; the high-molecular membrane and the high-molecular material penetrated into the non-woven fabric are integrated with the bulges. The filter capacity, reverse pressure resistance and flux recovery capability after pollution of the slab separating membrane provided by the invention are all improved and the reverse cleaning of the slab separating membrane can be realized.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and relates to a flat separation membrane and a preparation method thereof. Background technique [0002] Membrane separation technology is an efficient solid-liquid separation technology, which is widely used in the field of industrial water treatment due to its simple equipment, stable operation, low energy consumption, and high separation efficiency. With the continuous improvement of membrane material performance and continuous optimization of treatment process, membrane separation technology will play a more meaningful role in water treatment. [0003] Separation membrane is the core component in the membrane separation process, mainly including flat separation membrane, tubular separation membrane, hollow fiber separation membrane and other types. The performance of separation membrane is the key issue in membrane separation technology, which is determined by membrane material ...

Claims

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Application Information

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IPC IPC(8): B01D71/06B01D69/06B01D67/00C02F1/44
CPCB01D67/0011B01D67/0013B01D69/06B01D71/06C02F1/444
Inventor 李宁何福海杨楠魏齐程志军
Owner 中科瑞阳膜技术(北京)有限公司
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