超重力-水热法制备绿色纳米阻燃材料

利用超重力旋转床碳分制备纳米三水铝石凝胶，将此凝胶与结构改性剂在高压搅拌釜中水热改性，得到一种新型的纳米级改性氢氧化铝粉体，其热失重温度超过350 ℃，热失重率为51％。研究了对超重力碳分过程的料液温度、超重力水平、气液比、铝酸钠浓度、pH值终点的影响和水热改性过程中前体的选择、改性温度、改性剂与纳米三水铝石物质的量之比、纳米三水铝石的浓度的影响规律和过程机理。 通过分析表征确定，改性过程为酯化反应；改性产品是超薄菱形颗粒，厚度为20～40 nm，长轴为100～200 nm，短轴为50～100 nm。

Preparation of green nano flame retardant by high gravity-thermal hydrolysis

Nano aluminum trihydroxide gels were prepared by carbonation in rotating packed bed under high gravity，then were subsequently modified by thermal hydrolysis in an agitated closed vessel to synthesize a novel nano-scale modified aluminum hydroxide powder with the beginning of thermal decomposition higher than 350℃ and weight loss of 51%. The mechanisms of carbonation and modification processes, as well as the influences of such factors as temperature, high gravity level, gas/liquid ratio, sodium aluminate concentration, final pH on carbonation and the influences of such factors as selection of precursors, temperature, modifier/ aluminum trihydroxide, aluminum trihydroxide concentration on modification were analyzed in detail. The modified product was formed by esterification and had ultra thin rhombic morphology of 20～40 nm in thickness, 100～200nm in length, and 50～100nm in width.