CHINESE JOURNAL OF ENERGETIC MATERIALS
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黏结剂对喷雾干燥FOX-7基PBXs的性能影响
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1.宁波工程学院,材料与化学工程学院,安全工程学院,浙江 宁波 315211;2.中北大学环境与安全工程学院,山西 太原030051;3.山西省超细粉体工程技术研究中心,山西 太原 030051

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2021年浙江省教育厅一般科研项目(Y202147546);宁波工程学院2021年科研启动金(2022KQ15)


Effect of Binders on Properties of FOX-7 based PBXs by Spray Drying
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1.School of Materials and Chemical Engineering, School of Safety Engineering, Ningbo University of Technology, Ningbo 315211, China.;2.School of Environment and Safety Engineering, North University of China, Taiyuan 030051, China.;3.Shanxi Engineering Technology Research Center for Ultrafine Powder, North University of China, Taiyuan 030051, China

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    摘要:

    为研究喷雾干燥制备高聚物粘结炸药(Polymer Bonded Explosives, PBXs)的包覆机理和黏结剂种类及含量对PBXs性能的影响,分别以聚酯型热塑性聚氨酯(Estane 5703)、氟树脂(F2314)、氟橡胶(F2602)和丙烯酸酯橡胶(ACM)为黏结剂,采用喷雾干燥技术制备细化FOX-7和含有不同黏结剂种类和含量的1,1-二氨基-2,2-二硝基乙烯(FOX-7)基PBXs。分别采用场发射扫描电子显微镜(FE-SEM)、X射线衍射仪(XRD)、差示扫描量热仪(DSC)、撞击感度测试仪测试样品的表面形貌、晶型、热分解特性和撞击感度,研究黏结剂种类和含量对FOX-7基PBXs性能影响。结果表明,喷雾干燥包覆样品晶型均为α-FOX-7;Estane 5703包覆样品拥有最佳的球形度、表面光滑度和机械安全性,但表观活化能降低10.61%,F2602包覆样品的热稳定性好,二者作为黏结剂均可有效降低FOX-7的撞击感度;黏结剂含量为3%~5%时,FOX-7基PBXs造型粉颗粒表面光滑,包覆黏结效果好;黏结剂含量为5%时,FOX-7基PBXs安全性能最佳。由FOX-7在熔融态下PBXs的微观形貌,分析喷雾干燥制备PBXs中黏结剂的包覆结构和降感机理,对比细化FOX-7和PBXs的撞击感度和表面元素原子比及化学态变化对其进行验证。

    Abstract:

    To figure out the coating mechanism of polymer bonded explosives (PBXs) prepared by spray drying and the effects of binders types and contents on the performance of PBXs, refined 1,1-diamino-2,2-dinitroethylene (FOX-7) and FOX-7 based PBXs with different binder types and contents were prepared by spray drying at the presence of poly ester urethane elastomer (Estane 5703), fluororesin (F2314), fluorine rubber (F2602) and acrylic rubber (ACM) as binders, respectively. The surface morphology, crystalline states , thermal decomposition properties and impact sensitivity of the samples were characterized by field emission scanning electron microscopy (FE-SEM), X-ray diffractometer (XRD), differential scanning calorimeter (DSC) and impact sensitivity instrument, respectively. The results indicated that the crystalline state of the resulting samples was α-type. The FOX-7 based PBXs composited by Estane 5703 had the best sphericity, surface smoothness and mechanical safety, while the apparent activation energy decreased by 10.61%. The PBXs composited by F2602 exhibits satisfactory thermal stability. Both binders can effectively reduce the impact sensitivity of FOX-7. When the compounded binders containing Estane 5703 and F2602 at the mass ratio of 4∶1 content was 3%-5%, the surface of FOX-7-based PBXs particles is smooth and the adhesive effect is attractive. When the compounded binder content was 5%, the resulting FOX-7-based PBXs possess excellent safety performance. The compositing structure and desensitization mechanism of binders in PBXs obtained by spray drying were analyzed from the microscopic morphology of FOX-7 in molten state. And the comparative analysis of impact sensitivity, atomic ratio of surface elements and chemical state changes between refined FOX-7 and resulting PBXs was carried out to verify them.

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引用本文

杨玥,李小东,董子文,等.黏结剂对喷雾干燥FOX-7基PBXs的性能影响[J].含能材料, 2023, 31(5):457-466. DOI:10.11943/CJEM2022261.
YANG Yue, LI Xiao-dong, DONG Zi-wen, et al. Effect of Binders on Properties of FOX-7 based PBXs by Spray Drying[J]. Chinese Journal of Energetic Materials, 2023, 31(5):457-466. DOI:10.11943/CJEM2022261.

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  • 收稿日期: 2022-10-17
  • 最后修改日期: 2023-05-15
  • 录用日期: 2023-05-12
  • 在线发布日期: 2023-05-15
  • 出版日期: 2023-05-25