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Cellulose acetate/nano cellulose blended ultrafiltration film

A technology of nanocellulose and cellulose acetate, applied in membrane technology, semi-permeable membrane separation, chemical instruments and methods, etc., can solve the problems of low anti-pollution, low flux of ultrafiltration membrane, etc. High throughput and improved hydrophilicity

Active Publication Date: 2015-12-02
DALIAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide an ultrafiltration membrane prepared by blending two components of cellulose acetate and nanocellulose, to solve the problems of low flux and low pollution resistance of cellulose acetate ultrafiltration membrane, and to solve the problems of low flux and low pollution resistance of cellulose acetate ultrafiltration membrane. The blending of elements improves the hydrophilicity, filtration performance and pollution resistance of the ultrafiltration membrane, and increases the mechanical strength

Method used

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  • Cellulose acetate/nano cellulose blended ultrafiltration film

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Embodiment

[0016] The cellulose acetate content is 97wt% of the polymer content, and the nanocellulose content is 3wt% of the polymer content. Add nanocellulose to 32.8wt% N,N-dimethylformamide, and use ultrasound to disperse nanocellulose fully and uniformly in it at room temperature. After the dispersion is completed, add it to the beaker, and then add the cellulose acetate , 2wt% polyethylene glycol, and 49.2wt% acetone were stirred in a water bath at 35°C until fully uniform. Then, the obtained casting solution is left to stand, and the bubbles remaining in the casting solution are removed by ultrasonic defoaming. Finally, pour the film-casting solution on a clean glass plate, scrape it with a scraper to form a film, and immerse it in an ice-water bath. After the film is formed and separated from the glass plate, rinse it with deionized water to obtain cellulose acetate / nanocellulose Blended ultrafiltration membranes. The tensile strength of the membrane was measured, and the resul...

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Abstract

The invention discloses a cellulose acetate / nano cellulose blended ultrafiltration film, belonging to the technical field of films. The blended ultrafiltration film is characterized by being prepared through the steps of firstly, pretreating raw material filter paper by adopting a water solution of alkali system sodium hydroxide / urea, carrying out suction filtration to be neutral, baking, then carrying out acidolysis by using a sulfuric acid solution, and diluting, centrifuging and drying to obtain nano cellulose; and then by adopting cellulose acetate and nano cellulose as film materials, adding an additive, selecting acetone and N,N-dimethylformamide as a mixed solvent, stirring uniformly, then defoaming, and after film scraping, soaking the material into a gel tank with a certain temperature to obtain the blended ultrafiltration film. The blended ultrafiltration film has the effects and benefits that the obtained ultrafiltration film has the good performances of cellulose acetate / nano cellulose, the porosity of the cellulose acetate / nano cellulose ultrafiltration film is improved, the pore diameter is increased, the hydrophilicity is improved, the ultrafiltration film has the advantages of high flux, good pollution resistance, good mechanical performance and the like, the operation is simple, the pretreatment is not needed, and the cost is low.

Description

technical field [0001] The invention belongs to the technical field of membranes, and relates to a preparation method for preparing nanocellulose and blending with cellulose acetate materials to prepare ultrafiltration membranes. Background technique [0002] Ultrafiltration is a pressurized membrane separation technology that intercepts macromolecular substances such as suspended solids, colloids, proteins and microorganisms in water under the action of external driving force, while water, inorganic salts and small molecular organic substances can pass through the membrane to achieve purification and purpose of separation. The ultrafiltration process is carried out at room temperature, with mild conditions, high separation efficiency, no phase change, no heating, low energy consumption, no need to add chemical reagents, no pollution, small footprint of the device, simple operation, easy control and maintenance, is An energy-saving and environment-friendly separation techno...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/16B01D69/02B01D67/00
Inventor 杨凤林吕金玲张国权
Owner DALIAN UNIV OF TECH
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