共查询到15条相似文献,搜索用时 78 毫秒
1.
改性水性聚氨酯乳液包覆RDX的合成研究 总被引:1,自引:1,他引:0
以聚四氢呋喃二醇(PTMG)为聚醚软段、甲苯二异氰酸酯(TDI)为硬段、DMPA(二羟甲基丙酸)为亲水扩链剂、环氧树脂(EP)和硅烷偶联剂为交联扩链改性剂,制取耐水性好、粘接强度高的改性水性聚氨酯(WPU)乳液;并以此作为黑索今(RDX)的包覆剂。结果表明:当w(EP)=6%(相对于物质总质量而言)、w(硅烷偶联剂)=2.0%(相对于物质总质量而言)和w(WPU)=2%(相对于RDX质量而言)时,经改性WPU乳液包覆后的RDX,其成型性、流散性和包覆效果较好,撞击感度和热感度明显降低。 相似文献
2.
水性聚氨酯包覆RDX的影响因素研究 总被引:1,自引:0,他引:1
以环氧有机硅复合改性的水性聚氨酯(WPU)作为黑索今(RDX)包覆剂,研究了包覆温度、WPU用量、RDX粒度及表面活性剂种类和用量对包覆后RDX机械感度、热感度和流散性的影响,并通过撞击感度测试、5s延滞期爆发点测试和金相显微镜晶型观测分析确定了较佳的包覆工艺条件。结果表明,包覆温度40℃、WPU质量分数2.0%、RDX粒度200~300目和阳离子表面活性剂质量分数0.5%~1.0%时,包覆后的RDX颗粒形状圆滑,感度较低,颗粒间包覆剂残留较少,流散性良好。 相似文献
3.
4.
5.
水性聚氨酯乳液的制备及其在含硝胺推进剂中的应用 总被引:11,自引:0,他引:11
以甲苯二异氰酸酯(TDI)、聚氧化丙烯二醇DL-400(Mn=340)、二羟甲基丙酸(DMPA)为主要原料,保持起始时n(NCO)∶n(OH)=1 7∶1,80℃反应1h,1,4 丁二醇(BDO)扩链,水中分散,制得水性聚氨酯乳液PU-1;运用FTIR、1HNMR表征了其结构;采用GPC测定了PU-1的数均相对分子质量Mn为32122,重均相对分子质量Mw为82785,可用作粘附剂。将合成的PU-1乳液应用于复合固体推进剂(NEPE),采用加入十二水硫酸铝钾(明矾)水溶液〔m(明矾)∶m(水)=1∶10〕沉降乳液的方法包覆氧化剂填料黑索今(RDX),使其形成微胶囊;采用SEM观察了包覆结果,发现包覆后的RDX表面圆滑,包覆后的RDX之间流散性较好。通过撞击感度实验,表明包覆后RDX的撞击感度比包覆前下降了28%;通过外壳溶出实验,测得包覆后RDX中聚氨酯包覆层的质量占样品总质量的1 48%,符合军用标准。水性聚氨酯乳液可作为包覆壁材应用于NEPE推进剂中。 相似文献
6.
采用喷射细化法和滴加法,制备了3种粒度的黑素今(RDX)粉末.采用激光粒度仪、比表面积分析仪和扫描电子显微镜对样品进行了表征,对其火焰感度、慢烤热感度及热分解特性进行了测试,其中用50%的发火高度表示其火焰感度,用爆发点的温度表示其慢烤热感度.结果表明,随着RDX粒度的减小,RDX的火焰感度和慢烤热感度均逐步升高.从理... 相似文献
7.
8.
以丙烯酸丁酯(BA)和苯乙烯(St)为改性剂、双丙酮丙烯酰胺(DAAM)为交联剂,采用自由基引发聚合工艺,制备出高性能的BA/St改性水性聚氨酯(WPU)包装用胶粘剂。采用红外光谱(FT-IR)仪和粒度分析仪对乳液的结构和性能进行了分析,讨论了R值(即-NCO/-OH的物质的量比)、改性剂、St和交联剂用量对胶粘剂粘接强度的影响。试验结果表明:当R=1.1、w(改性剂BA/St)=28%(相对于WPU而言)、w(St)=30%(相对于BA/St而言)和w(DAAM)=2%时,乳液的粘接性能最佳;由该乳液配制的胶粘剂可以满足多种复合软包装膜的使用要求。 相似文献
9.
10.
提高水性聚氨酯耐水性的研究 总被引:4,自引:1,他引:3
为了制备耐水性能较好的水性聚氨酯(WPU),以聚酯二元醇(PBA)、甲苯二异氰酸酯(TDI)和二羟甲基丙酸(DMPA)等为主要原料合成了WPU乳液,着重探讨了DMPA含量、R值[即n(-NCO)/n(-OH)]和交联剂对WPU胶膜耐水性能的影响。实验结果表明,当w(DMPA)=4%、R=1.5时,制得的WPU胶膜耐水性较好;采用不同的室温交联剂对WPU进行交联改性,当w(氮丙啶型交联剂A)=3%时(相对于WPU乳液干固量而言),WPU胶膜的吸水率降低至3%左右,并具有较好的持久耐水性。 相似文献
11.
Surface Coating of RDX with a Composite of TNT and an Energetic‐Polymer and its Safety Investigation
Chong‐Wei An Feng‐Sheng Li Xiao‐Lan Song Yi Wang Xiao‐De Guo 《Propellants, Explosives, Pyrotechnics》2009,34(5):400-405
To improve the safety of RDX (hexogen), an energetic polymer (HP‐1) was introduced to coat RDX with 2,4,6‐trinitrotoluene (TNT) by combining the solvent–nonsolvent and the aqueous suspension‐melting method. Scanning electron microscope (SEM), transmission electron microscope (TEM), and X‐ray photoelectron spectrometry (XPS) were employed to characterize the samples, and the role of HP‐1 in the coating process was discussed. The impact sensitivity, friction sensitivity, and the thermal stability of unprocessed and coated RDX were investigated, and the explosion heat of samples was also estimated. Results indicate that HP‐1 improves the wetting ability of the liquid coating material on RDX surface and reinforces the connection between RDX and the coating material. By surface coating, the impact and friction sensitivity of RDX decrease obviously; the drop height (H50) is increased from 37.2 to 58.4 cm, and the friction probability is reduced from 92 to 38%. The activation energy (E) and the self‐ignition temperature increase by 10457.38 J⋅mol−1 and 1.8 K, respectively. The explosion heat is reduced merely by 0.93%. 相似文献
12.
Yan Bao Ruyue Guo Qiaoling Kang Chao Liu Wenbo Zhang Qian Zhu 《Ceramics International》2021,47(17):24597-24606
Size-controllable double-shell hollow TiO2@SiO2 spheres (DHTSs) were fabricated using a simple sol-gel reaction. The size of DHTSs was controlled by using PS spheres with different size as templates. Moreover, DHTSs was also incorporated into waterborne polyurethane (WPU) matrix to prepare WPU/DHTSs composite film as glass coating. The effect of the diameter of DHTSs on the transparency, thermal insulation and UV-shielding properties of WPU/DHTSs composite film were investigated in detail. And the results revealed that the composite film with 230 nm-sized DHTSs exhibited the optimum performance. In addition, the temperature rise rate in the chamber fitted with the glass coated by WPU/DHTSs composite film (26%) was lower than that fitted with the common glass without coated by anything (48%). Therefore, the transparent coating with excellent thermal insulation and good UV-shielding properties will become a potential energy saving building glass coating. 相似文献
13.
采用端羟基聚丁二烯(HTPB)通过2种不同方法包覆RDX,对比样品的性能测试结果,研究了HTPB的含量及工艺条件对包覆效果的影响。结果表明,影响悬浮法包覆效果的主要因素是HTPB质量分数,且其质量分数增大可以明显改善包覆效果;减小撞击感度,HTPB的四氯化碳溶液的滴加速度对包覆效果无显著影响;溶剂蒸发法中采用TDI与HTPB同时加入包覆效果好,HTPB所占比例同样是影响包覆效果的主要因素。 相似文献
14.