▎ 摘　　要

NOVELTY - Preparing graphene oxide/titanium dioxide/silica composite coating comprises: reacting the natural micron or nano-graphite with a strong oxidant at 20-40 degrees C for 1-3 hours to obtain an graphene oxide slurry; washing 1-2 g graphene oxide slurry with water until it is neutral; drying the graphene slurry, then dispersing in water and subjecting to ultrasound dispersion to obtain graphene oxide dispersion; adding titanium dioxide and silica into above dispersion, treating ultrasonically, centrifuging and drying to obtain graphene oxide supported titanium dioxide/silica powder solid product. USE - The method is useful for preparing graphene oxide/titanium dioxide/silica composite coating (claimed). ADVANTAGE - The composite coating has high stability, good dispersibility, capable of absorbing formaldehyde with antibacterial function and low temperature far infrared function. DETAILED DESCRIPTION - Preparing graphene oxide/titanium dioxide/silica composite coating comprises: (i) reacting the natural micron or nano-graphite with a strong oxidant at 20-40 degrees C for 1-3 hours to obtain an graphene oxide slurry; (ii) washing 1-2 g graphene oxide slurry with water until it is neutral; (iii) drying the graphene slurry, then dispersing in water and subjecting to ultrasound dispersion to obtain graphene oxide dispersion; (iv) adding titanium dioxide and silica into above dispersion, treating ultrasonically, centrifuging and drying to obtain graphene oxide supported titanium dioxide/silica powder solid product; (v) adding the solid product, hydrazine hydrate solution and aqueous ammonia mixed solution into deionized water, stirring, reacting under water bath, cooling, washing, centrifuging and drying to obtain graphene oxide/titania/silica composite material; (vi) adding distilled water into graphene oxide/titania/silica composite material, subjecting to ultrasound dispersion at 60-180 W for 3-7 hours to obtain graphene oxide/titania/silica composite material; and (vii) adding the composite material into aqueous polyurethane in a mass ratio of 1-10:100, adding distilled water, subjecting to ultrasound dispersion at 60-180 W for 4-8 hours.