▎ 摘　　要

NOVELTY - Preparing flexible electronic display screen using nanocellulose/graphene composite involves using display layer of the display screen comprises a substrate, an electrode pixel layer, a graphene and a nanocellulose composite conductive layer. An electrode pixel layer is provided on the substrate, graphene and nanocellulose conductive layer is provided on the electrode pixel layer. The graphene and nanocellulose composite conductive layer are prepared and set on the electrode pixel layer by adding 2-4 pts. wt. graphite powder to 100-200 parts by volume of a mixed acid of concentrated sulfuric acid and concentrated phosphoric acid having a volume ratio of 9:1, and then slowly adding 6-12 pts. wt. potassium permanganate and stirring uniformly. The temperature is raised to 45-55 degrees C and kept for 9-15 hours to obtain a suspension, the obtained suspension is poured into 100-200 pts. wt. ice-water mixture to be cooled. USE - Method for preparing a flexible electronic display screen used in ultrafiltration membrane for ultrafiltration, has a pore size of 1.2 micrometer and a pressure of 0.24 Mega Pascals. ADVANTAGE - The method enables to prepare flexible electronic display screen, which has excellent optical performance and mechanical properties, and achieves a large bending and show the picture clearly. DETAILED DESCRIPTION - Preparing flexible electronic display screen using nanocellulose/graphene composite involves using display layer of the display screen comprises a substrate, an electrode pixel layer, a graphene and a nanocellulose composite conductive layer. An electrode pixel layer is provided on the substrate, graphene and nanocellulose conductive layer is provided on the electrode pixel layer. The graphene and nanocellulose composite conductive layer are prepared and set on the electrode pixel layer by adding 2-4 pts. wt. graphite powder to 100-200 parts by volume of a mixed acid of concentrated sulfuric acid and concentrated phosphoric acid having a volume ratio of 9:1, and then slowly adding 6-12 pts. wt. potassium permanganate and stirring uniformly. The temperature is raised to 45-55 degrees C and kept for 9-15 hours to obtain a suspension, the obtained suspension is poured into 100-200 pts. wt. ice-water mixture to be cooled, 0.5-1 pts. wt. microcrystalline cellulose is added and the reaction is stirred 10-20 Minutes, slowly continue to add 4-8 parts by volume of H2O2 solution to obtain a bright yellow solution while releasing a large number of bubbles, filtering and repeatedly washing with hot water until the pH of the filtrate is neutral to obtain a filter cake. The filter cake obtained is again dispersed in water, and dialyzed against water for 3-5 days, and the pH of the resulting suspension is adjusted to 9-10 with ammonia water, and added to an aqueous solution containing 3-9 pts. wt. vitamin C. The volume of the solution is 50-100, the water temperature is 90-96 degrees C, the reaction time is 60-180 minutes. The filter cake is repeatedly washed with water until the pH of the filtrate is neutral. The filter cake is again dispersed in water, and subjected to high-pressure homogenization treatment for 10-20 times by a homogenizer assembly, and the resulting suspension is ultrafiltered to obtain a solution of the nanocellulose/graphene composite material and deposited on the electrode pixel layer as a transparent electrode by different coating methods.