Cellulose grafted carboxymethyl imidazole chlorine salt gas separation membrane and preparation method thereof

The invention belongs to the field of high polymer materials and engineering, and particularly relates to a preparation method of a cellulose grafted carboxymethyl imidazole chloride salt gas separation membrane, which comprises the following steps of: putting cellulose acetate and 1-carboxymethyl-3-methylimidazole chloride salt into a reaction container, vacuumizing the reaction container, and introducing nitrogen; adding a tetrahydrofuran solution, stirring for 48 hours at room temperature, pouring a reaction product into a large amount of methanol, washing for a week, carrying out centrifugal treatment, and drying in a vacuum drying oven; preparing a branch product membrane casting solution by taking tetrahydrofuran as a solvent, and standing until no bubbles exist in the membrane casting solution; and paving a film on a clean glass plate, naturally drying for one night, and taking down the film from the glass plate to obtain the gas separation film after grafting reaction. The separation membrane can be u