Cellulose acetate/nano cellulose blended ultrafiltration film

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...

AI Technical Summary

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

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