▎ 摘　　要

NOVELTY - Modifying aqueous polyurethane involves using a nano-tin-tin-ruthenium-graphene composite titanium dioxide, preparing modified nano-tin-oxide-based aqueous slurry by 1-2 pts. wt. nano tin oxide cerium, dispersing in 10-20 pts. wt. absolute ethanol mixed solution, 0.5-1 pts. wt. deionized water and 0.1-0.2 pts. wt. silane coupling agent. The aqueous solution is added dropwise to adjust the pH to 8-10, and the ball milling is carried out for 5-6 hours, rotary centrifuged, washed with absolute ethanol until the pH of the solution is neutral, and fully dried in a vacuum drying oven at 95-105 degrees C for 1-2 hours to obtain surface-modified nano-tin lanthanum. The nano tin oxide bismuth is dispersed in distilled water in mass ratio of 1:5-10, is dispersed by a ball mill at a rate of 500 revolutions per minute for 3-4 hours to obtain a modified nanometer tin oxide cerium aqueous slurry. The graphene composite titanium dioxide is prepared by mixing 0.05-0.1 pts. wt. graphene oxide. USE - Method for modifying aqueous polyurethane. ADVANTAGE - The method enables to modify aqueous polyurethane in which product has long-term stable film forming performance, and good interface compatibility, improves the hardness, abrasion resistance and tensile strength of product. DETAILED DESCRIPTION - Modifying aqueous polyurethane involves using a nano-tin-tin-ruthenium-graphene composite titanium dioxide, preparing modified nano-tin-oxide-based aqueous slurry by 1-2 pts. wt. nanometers tin oxide cerium, dispersing in 10-20 pts. wt. absolute ethanol mixed solution, 0.5-1 pts. wt. deionized water and 0.1-0.2 pts. wt. silane coupling agent. The aqueous solution is added dropwise to adjust the pH to 8-10, and the ball milling is carried out for 5-6 hours, rotary centrifuged, washed with absolute ethanol until the pH of the solution is neutral, and fully dried in a vacuum drying oven at 95-105 degrees C for 1-2 hours to obtain surface-modified nano-tin lanthanum. The nano tin oxide bismuth is dispersed in distilled water in mass ratio of 1:5-10, is dispersed by a ball mill at a rate of 500 revolutions per minute for 3-4 hours to obtain a modified nanometer tin oxide cerium aqueous slurry. The graphene composite titanium dioxide is prepared by mixing 0.05-0.1 pts. wt. graphene oxide into 0.05-0.1% solution, ultrasonically stripped for 30-35 minutes, uniformly dispersed. 1-2 pts. wt. nano titanium dioxide is added, ultrasonically shaken for 10-15 minutes, uniformly mixed, deionized water, hydrazine hydrate solution are added, concentrated aqueous ammonia is added, stirred vigorously for 5-10 minutes at 94-96 degrees C, reacted mixture on bath for 1-2 hours, transfer at 80-83 degrees C for drying in an evaporating dish, and ground to obtain graphene composite titanium dioxide powder. The modified water-based polyurethane is prepared by adding silane to 90-100 pts. wt. aqueous polyurethane modified nano-montmorillonite, the modified nanocellulose and the materials and dispersed by a high-speed disperser for 10-15 minutes, and ultrasonicated by a ultrasonic cell pulverizer for 15-20 minutes to obtain modified water-based polyurethane.