▎ 摘　　要

NOVELTY - Building decorative board comprises main body of decorative plate and glass fiber mesh cloth. The glass fiber mesh cloth is laid on the upper and lower sides of main body of decorative plate. The main body of decorative plate comprises material A, material B, material C and material D. The material A comprises 2-3 wt.% modified pseudo boehmite, 0.1-0.3 wt.% graphene, 0.5-1.7 wt.% tourmaline powder and 5-8 wt.% nano-taitanium dioxide dispersion. The material B comprises 5-10 wt.% magnesia iron alumina spinel refractory. The material C comprises 18-20 wt.% Portland cement, 15-20 wt.% quartz sand, 8-10 wt.% expanded glass bead, 3-5 wt.% bamboo charcoal powder and 1.4-2 wt.% foaming agent. The material D comprises 5-10 wt.% aqueous polyurethane resin emulsion and balanced water. USE - Building decorative board. ADVANTAGE - The board has excellent performance, not greater than 0.10 mm/m water swelling rate, not greater than 92.1% formaldehyde purification rate, not greater than 89.6% formaldehyde purification lasting rate and not greater than 99.9% antibacterial rate of Escherichia coli. DETAILED DESCRIPTION - Building decorative board comprises main body of decorative plate and glass fiber mesh cloth. The glass fiber mesh cloth is laid on the upper and lower sides of main body of decorative plate. The main body of decorative plate comprises material A, material B, material C and material D. The material A comprises 2-3 wt.% modified pseudo boehmite, 0.1-0.3 wt.% graphene, 0.5-1.7 wt.% tourmaline powder and 5-8 wt.% nano-taitanium dioxide dispersion. The material B comprises 5-10 wt.% magnesia iron alumina spinel refractory. The material C comprises 18-20 wt.% Portland cement, 15-20 wt.% quartz sand, 8-10 wt.% expanded glass bead, 3-5 wt.% bamboo charcoal powder and 1.4-2 wt.% foaming agent. The material D comprises 5-10 wt.% aqueous polyurethane resin emulsion and balanced water. The preparation of modified pseudo boehmite comprises grinding pseudo boehmite, adding 0.1 mol/l dilute nitric acid solution, mixing for 2 hours at 50 degrees C, filtering, washing, adding mixture containing 0.01-0.02 mol/L iron (III) nitrate, 0.01-0.03 mol/L copper (II) nitrate and 0.01-0.02 mol/l silver nitrate, performing ultrasonic impregnation at 35-45 degrees C for 3 hours, adding 0.3 mol/L ammonia solution, mixing for 1-3 hours, filtering and roasting in muffle furnace at 400-550 degrees C for 4 hours. The ratio of pseudo boehmite, dilute nitric acid solution, mixed solution and ammonia solution is 1 g: 10-15 ml: 20-40 ml: 5-20 ml.