水性聚氨酯乳液的制备及其包覆RDX的研究

Preparation of waterborne polyurethane latex and study on its cladding of RDX

关键词:  固体推进剂  推进剂包覆  水性聚氨酯乳液+  破乳+  黑索今

Key words:  Solid propellant  Propellant cladding  Waterborne polyurethane latex~+  Depositing latex  Hexogen

摘要:

为提高复合固体推进剂 (NEPE) 的性能, 采用乳液聚合 破乳的方法, 用水性聚氨酯 (WPU) 乳液对固体填料黑索今 (RDX) 进行包覆。FTIR, GPC表征了WPU的结构特征; 正交实验确定了最佳包覆条件:1 00g的RDX, 破乳剂用量占乳液用量的 1 /4, 反应时间为 20min, 反应温度 40°C。通过SEM, XPS和包覆层质量百分数对包覆后的RDX进行表征。结果表明: WPU包覆后的RDX表面有清晰包覆层, 包覆度R为 65 15%; WPU包覆层的质量百分数为 1 48%。撞击感度实验表明包覆后RDX的特性落高h50为 45 3cm, 比包覆前提高了 19cm。实验证明: 水性聚氨酯乳液聚合 破乳方法包覆RDX, 能够显著提高RDX的钝感性能。

Abstract:

Waterborne polyurethane（WPU） latex was used to coat solid padding RDX by means of latex polymerization-deposition in order to improve property of Complex Solid Propellant（NEPE）.The structure of WPU were performed by measurements of FTIR and GPC.Optimization coating condition was determined by orthogonal experiment: 1.00g RDX; the ratio of quantum 10% alum to latex PU-1 is 1/4; reaction time 20 min and temperature 40℃.The characterization of RDX coated by WPU were performed by measuring SEM, XPS and mass fraction of coating layer. The results indicated that surface of RDX coated by WPU latex was covered with clear and pliable film.Coating degree R was calculated as 61.15%. Mass fraction of coating layer was determined as 1.48%. Bump sensitivity experimental results indicated that the special height h₅₀ of RDX coated by WPU was determined as 45.3 cm, which increased 19.0 cm than that before coating.Experiments proved that coating RDX by polymerization-depositing WPU latex can enhance the desensitization performance of RDX.