Preparation method of cellulose membrane by using ion liquid as solvent

Abstract

The invention provides a method for making a cellulose membrane taking ionic liquid as a solvent. The method comprises the following steps that: (1) floccosem or crushed cellulose is mixed with the ionic liquid and is dissolved for 0.5 to 120 hours at a temperature of between 50 and 160 DEG C to prepare a membrane making stock solution, the concentration is between 5 and 35 percent; (2) after the membrane making stock solution is filtered and deaerated, the membrane is made, wherein, a solidification solution is an ionic liquid aqueous solution with a temperature of between 0 and 95 DEG C and a concentration of between 0 and 90 percent. The method is convenient and simple as well as economic, protects the environment and satisfies the industry needs. The cellulose membrane made by the method can be taken as a packaging material, a decorating material and a printing material or a filter membrane and a reverse osmosis membrane.

Description

technical field [0001] The invention relates to a method for preparing a cellulose film, in particular to a method for preparing a cellulose film using an ionic liquid as a solvent. Background technique [0002] Cellulose membranes prepared from cellulose are widely used in many industries. The raw material cellulose for the preparation of cellulose membranes has a large reserve in natural substances and has a huge renewable capacity. Cellulose It can be biodegraded or safely burned into water vapor and carbon dioxide, which is environmentally friendly. With the increasing shortage of non-renewable natural energy sources, such as coal, oil, and natural gas, the utilization of cellulose will gradually expand. Therefore, the development of fiber The prospect of preparing cellulose film from cellulose is very broad, and it is entirely possible to become a renewable resource to replace petroleum and cracked film products. At present, sodium hydroxide, acetone, carbon disulfide, ...

AI Technical Summary

Problems solved by technology

[0002] Cellulose membranes prepared from cellulose are widely used in many industries. The raw material cellulose for the preparation of cellulose membranes has a large reserve in natural substances and has a huge renewable capacity. Cellulose It can be biodegraded or safely burned into water vapor and carbon dioxide, which is environmentally friendly. With the increasing shortage of non-renewable natural energy sources, such as coal, oil, and natural gas, the utilization of cellulose will gradually expand. Therefore, the development of fiber The prospect of preparing cellulose film from cellulose is very broad, and it is entirely possible to become a renewable resource to replace petroleum and cracked film products. At present, sodium hydroxide, acetone, carbon disulfide, etc. are mainly used as solvents and auxiliary materials to prepare cellulose films from cellulose. agent, and it is necessary to yellow, age and ripen the raw material cellulose. At the same time, chemical ingredients such as sulfite, sodium sulfide, sulfuric acid and zinc sulfate are also used. The chemical raw materials currently used to prepare cellulose film from cellulose, It has great corrosion to equipment, high energy consumption and operating costs, long and complicated production process, and there are many problems such as waste gas, waste water, waste residue pollution, treatment and recycling, etc.

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