水性聚氨酯乳液破乳法包覆钝感ε-HNIW的影响因素  

Desensitizing Efficiency of ε-HNIW Coated by Demulsification of Aqueous Polyurethane Emulsion

作　　者：孟征[1] 欧育湘[1] 刘进全[1] 赵毅[1] 

机构地区：[1]北京理工大学材料科学与工程学院,北京100081

出　　处：《含能材料》2007年第4期387-390,共4页Chinese Journal of Energetic Materials

基　　金：总装预研基金项目(12060451867)

摘　　要：采用水性聚氨酯乳液破乳法包覆了ε-HNIW。通过正交实验L9(34)和单因素实验,对影响包覆效果及产品感度的诸多因素进行了分析,结果表明,影响因素大小顺序为温度、溶剂添加量、破乳剂溶液添加量及搅拌速度,其中温度的选择和溶剂用量直接关系到最终产品的粒度及包覆效果,最佳的工艺条件是破乳温度为45℃,溶剂与聚氨酯质量比为8∶1,破乳剂溶液与聚氨酯质量比为4∶1,搅拌速度为300r.min-1。表面活性剂要在破乳之后添加才能有效控制粒度并防止颗粒间团聚,在破乳前添加会影响破乳结果。在最佳工艺条件下制备的包覆产品为小球型颗粒,表面聚氨酯包覆均匀,特性落高H50比未包覆的ε-HNIW提高了22cm。ε-HNIW was coated with aqueous polyurethane emulsion by demulsification. The factors affecting the coating efficiency and the impact sensitivity of coated ε-HNIW were investigated and analyzed via orthogonal L9 （3^4 ） test design and single factor experiment. The experiment results show that the important factors are coating temperature, the add-on of solvent and demulsifier solution, and agitating rate. The temperature and the add-on of solvent are directly related with the particle size, size distribution of the coated ε-HNIW and the coating efficiency. The optimum conditions are reaction temperature 45 ℃ , the weight ratio of solvent PU 8： 1, the weight ratio of demulsifier solution PU 4： 1, agitating rate 300 r · min^-1 The surfactant is added to the reaction system after demulsification to control the particle size and prevent the granules to agglomerating. The coating decreases the impact sensitivity as the H50 of ε-HNIW increases from 15 cm（uncoated） to 37 cm （ coated）.

关 键 词：材料科学 破乳法 水性聚氮酯乳液 包覆 ε-HNIW 

分 类 号：V512[航空宇航科学与技术—航空宇航推进理论与工程]