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Multilayer composite ultrafiltration membrane and preparation method thereof

A multi-layer composite and ultrafiltration membrane technology, which is applied in ultrafiltration, chemical instruments and methods, membrane technology, etc., can solve the problems of reduced cleaning efficiency, inability to perform backwashing, and insufficient bonding, so as to improve cleaning efficiency and enhance Water flux, enhanced anti-fouling effect

Active Publication Date: 2015-11-11
上海展恒环保科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The single-layer cellulose membrane cannot be backwashed during the cleaning process due to the insufficient bonding with the substrate, which reduces the cleaning efficiency

Method used

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  • Multilayer composite ultrafiltration membrane and preparation method thereof

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preparation example Construction

[0027] The concrete steps of the preparation method of multilayer composite ultrafiltration membrane of the present invention are as follows:

[0028] (1) Select one of polyethersulfone, polysulfone, polyacrylonitrile, and polyvinylidene fluoride film-forming polymer powder, dissolve it in a polar organic solvent, and stir at 20-80°C to obtain a polymer solution. The polymer solution is vacuum degassed at 20-80°C for 1-12 hours to obtain a spinning solution, or a polymer / polar organic solvent solution is used as a spinning solution, and the polar organic solvent is N,N- Any one of dimethylformamide, N,N-dimethylacetamide, N-methylpyrrolidone, and dimethylsulfoxide; the concentration of the polymer in the spinning solution is 8-15wt%, and the rest It is a polar organic solvent;

[0029] (2) Use PET or PP non-woven fabric as the collected substrate for electrospinning, and the spinning solution in the above step (1) is the electrospinning solution to form a polymer nanofiber fi...

Embodiment 1

[0037] Dissolve polyvinylidene fluoride in N-methylpyrrolidone solvent, heat and stir in a water bath for 12 hours at 60°C to prepare a 10wt% PVDF / NMP solution. The PVDF / NMP solution was vacuum defoamed at room temperature for 2 hours to obtain a uniform electrospinning solution.

[0038] The commercially available PET non-woven fabric is used as the collected substrate for electrospinning, and the PVDF / NMP solution is used as the electrospinning solution to form a polymer nanofiber film layer on the substrate. The temperature of the spinning solution is 50°C, and the ambient temperature is 25°C. , the relative humidity was 50%, the spinning voltage was 20000V, the distance from the spinneret to the receiving plate was 12cm, the barrel extrusion rate was 45μL / min, and the thickness of the electrospun polymer nanofiber membrane was 30μm.

[0039] Measure 100ml of 1% bamboo dissociated fiber slurry in a 250ml three-necked flask, add 0.1g sodium bromide and 0.5% 0.02g TEMPO reage...

Embodiment 2

[0042] Take two electrospun polymer nanofiber membranes——PVDF nanofiber membrane and PET non-woven fabric matrix, soak them together in a hydrochloric acid solution with a pH value of 1, take them out, and coat the surface of one of the polymer nanofiber membrane layers An aqueous dispersion of cellulose nanofibers with a thickness of 0.5 mm is placed on top to form a cellulose nanofiber film layer to obtain a composite film with a three-layer structure. Then one side of the polymer nanofiber membrane layer of another electrospun polymer nanofiber membrane is covered on the cellulose nanofiber membrane layer of the 3-layer structure composite membrane to form a composite membrane with a 5-layer symmetrical structure.

[0043] Others are the same as embodiment 1.

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Abstract

The invention discloses a multilayer composite ultrafiltration membrane and a preparation method thereof. The multilayer composite ultrafiltration membrane is characterized by being provided with five layers of structures, wherein each of the inner and outer surfaces of the ultrafiltration membrane is a PET or PP non-woven fabric base body, each of the inner and outer subsurfaces of the ultrafiltration membrane is a polymer nanofiber membrane layer, and the middle layer of the ultrafiltration membrane is a cellulose nanofiber membrane layer. A polymer in the polymer nanofiber membrane layer is selected from one of polyether sulfone, polysulfone, polyacrylonitrile and polyvinylidene fluoride film forming polymers, and then is processed to prepare a spinning solution, and electrostatic spinning dope forms the polymer nanofiber membrane layers on PET or PP non-woven fabrics serving as the base bodies for electrostatic spinning collection. The cellulose nanofiber membrane layers are prepared by selecting one of bamboo, wood, cotton and linen, dissociating fiber slurry and processing. The multilayer composite ultrafiltration membrane prepared by the method has good hydrophily, higher pollutant resistance and water flux, and better interception characteristic, and is more economical in use and longer in service life.

Description

technical field [0001] The invention relates to a membrane for filtration, in particular discloses a multilayer composite ultrafiltration membrane composed of non-woven fabric, electrospun nanofiber membrane and cellulose nanofiber and its preparation method, which is applied to industrial sewage treatment and drinking water Membrane separation treatment systems in the preparation, food industry, medical and health, military and other industries. Background technique [0002] Membrane separation technology is to separate, fractionate, purify and enrich the solute and solvent in the mixture under the promotion of external energy or chemical potential difference by means of the selective osmosis of the membrane. Some experts even call the development of membrane separation technology the "third industrial revolution", and believe that it is one of the most promising high-tech technologies from the end of the 20th century to the middle of the 21st century, and it will play an i...

Claims

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Application Information

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IPC IPC(8): B01D69/12B01D61/18B01D67/00B32B9/02B32B9/04B32B27/02B32B27/08B32B27/32B32B27/36B32B33/00
Inventor 张秀芳李申初
Owner 上海展恒环保科技有限公司
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