▎ 摘　　要

NOVELTY - The composite wallpaper comprises sequentially bottom layer, printing layer and surface layer. The surface layer comprises PVC, oligosaccharide, palladium nanoparticles/graphene oxide nanocomposite, iron and steel aerated powder, zinc pyrithione, 2-chloro-4,5-difluorobenzoic acid and heat stabilizer. The palladium nanoparticles/graphene oxide nanocomposite is prepared by dispersing graphene oxide in water, adding palladium dichloride solution, adjusting pH using sodium hydroxide solution, adding sodium borohydride and drying to obtain final product. USE - Composite wallpaper (claimed). ADVANTAGE - The composite wallpaper has improved mold resistance, improved polymerization degree, improved wear resistance and tensile strength and less water permeability. DETAILED DESCRIPTION - Composite wallpaper sequentially comprises bottom layer, printing layer and surface layer. The surface layer comprises 1000 pts. wt. PVC, 8-12 pts. wt. oligosaccharide with molecular weight of 2200, 4-7 pts. wt. palladium nanoparticles/graphene oxide nanocomposite, 1-3 pts. wt. iron and steel aerated powder, 0.2-0.4 pt. wt. zinc pyrithione, 0.1-0.2 pt. wt. 2-chloro-4,5-difluorobenzoic acid and 0.4-0.6 pt. wt. heat stabilizer. The palladium nanoparticles/graphene oxide nanocomposite is prepared by dispersing graphene oxide in water, ultrasonically processing for 2 hours, adding 0.02 mol/L concentration of palladium dichloride solution to 6-8 wt.% graphene oxide, stirring, adjusting pH to 10 using 1 mol/L concentration of sodium hydroxide solution, adding sodium borohydride, heating at 55-60 degrees C, stirring for 8-10 hours, filtering, rinsing with deionized water for 5-8 minutes, drying in vacuum at 75 degrees C for 12 hours. An INDEPENDENT CLAIM is included for preparation of composite wallpaper, which involves (1) adding PVC slurry and remaining raw materials, constantly stirring for 5-10 minutes to obtain mixed slurry, (2) printing the printed layer on bottom layer, uniformly coating mixed slurry with coating amount of 400-450 g/2 over printed layer, and (3) heating and drying at 120-140 degrees C for 60-80 seconds.