超重力-水热法制备绿色纳米阻燃材料  

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

作　　者：王东光[1] 郭奋[1] 陈建峰[1] 张泽廷[1] 

机构地区：[1]北京化工大学纳米材料先进制备技术与应用科学教育部重点实验室教育部超重力工程研究中心,北京100029

出　　处：《化工进展》2006年第2期181-186,共6页Chemical Industry and Engineering Progress

基　　金：国家"863"科技攻关项目(No.2002AA302605)

摘　　要：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20～40nm,长轴为100～200 nm,短轴为50～100nm。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 tdhydroxide 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.

关 键 词：超重力 水热法 改性 纳米 氢氧化铝 

分 类 号：TQ050.421[化学工程]