▎ 摘　　要

NOVELTY - The method for preparing nano-micron multistage composite glass fiber, involves preparing graphene oxide solid by Hummers method, adding polydiallyldimethylammonium chloride to secondary water, adding glass fiber, adding prepared graphene oxide solution, preparing potassium permanganate solution and manganese(II) acetate, adding obtained graphene-modified glass fiber to solution of potassium permanganate to obtain mixed solution, adding secondary water, dripping manganese(II) acetate solution to obtained mixed solution, and drying to obtain final product. USE - Method for preparing nano-micron multistage composite glass fiber (claimed). ADVANTAGE - The method enables preparation of nano-micron multistage composite glass fiber with increased glass fiber surface roughness, increased specific surface area, uniform coating of graphene on the glass fiber, excellent alkali corrosion resistance and strong binding interface. DETAILED DESCRIPTION - Method for preparing nano-micron multistage composite glass fiber, involves (1) preparing 0.2-1.0 mg graphene oxide solid by Hummers method, (2) adding 100-800 mu L polydiallyldimethylammonium chloride to 200 mL secondary water, ultrasonically treating, evenly dispersing in the secondary water, (3) adding 10-50 g glass fiber, placing in a water bath oscillator at 20 degrees C, shaking for 24 hours, washing with secondary water, (4) adding prepared 200 mL graphene oxide solution, maintaining the reaction for 12 hours in an oscillating environment, washing the product with secondary water, placing in vacuum oven, drying in an environment at 50-70 degrees C, placing in desiccator, (5) preparing 10 mL potassium permanganate solution and 20 mL manganese(II) acetate, (6) adding 5-20 g obtained graphene-modified glass fiber to solution of potassium permanganate to obtain mixed solution, adding secondary water so that the total volume of the solution is 200 mL, dripping manganese(II) acetate solution to obtained mixed solution under an oscillation condition for 5-10 seconds, and (8) washing the obtained product with secondary water and drying at 60 degrees C to obtain final product. The dripping ratio of potassium permanganate to manganese(II) acetate solution is 2:3.