用于3D打印的光固化聚醚改性HTPB固体推进剂配方研究

Formulation research on UV-curable polyether modified HTPB solid propellant for 3D printing

3D打印技术在复杂结构推进剂药柱的制备方面具有显著优势,并且能够提升制备效率和安全性。在HTPB固体推进剂配方中添加新型光固化聚醚粘合剂进行改性,得到3D打印药浆,并采用防爆3D打印设备制备出复杂结构光固化聚醚推进剂药柱。采用DSC表征分别添加推进剂组分AP和Al的聚醚光固化粘合剂混合物分解温度,以验证聚醚光固化粘合剂与AP和Al的相容性;通过紫外光源、固化深度选择、推进剂挤出试验和粘度测试确定光固化聚醚HTPB固体推进剂配方;采用拉伸试验、孔隙率试验和密度试验表征3D打印光固化聚醚固体推进剂药柱性能,结果表明:光固化聚醚粘合剂与AP和Al的相容性较好,3D打印光固化聚醚HTPB固体推进剂药柱的拉伸强度为0.299 MPa,最大伸长率为22.4%,孔隙率为6.8%,密度为1.62 g/cm^(3)。

3D printing technology has significant advantages in the preparation of solid propellant grain with a complex structure and can improve manufacturing efficiency and process safety.The modified HTPB propellant slurry used for 3D-printing was prepared by adding a new UV-curable polyether adhesive,and the UV-curable polyether HTPB propellant grains with complex structures were fabricated by an explo-sion-proof 3D printer.In order to characterize the compatibility between the UV-curable polyether adhesive and AP or Al,the decomposition temperature of the UV-curable polyether adhesive with the addition of AP or Al was tested by DSC.The UV-curable polyether modified HTPB propellant formulations were determined by using the UV light source tests,the UV-curable depth tests,and propellant extrusion tests.The properties of UV-curable polyether propellant grains were characterized by tensile tests,porosity tests,density tests and viscosity test.The re-sults show that the UV-curable polyether adhesive is quite compatible to AP and Al;the tensile strength,the maximum elongation,the porosi-ty and the density of the 3D printed UV-curable polyether HTPB propellant grains are 0.299 MPa,22.4%,6.8%and 1.62g/cm^(3),respectively.