【摘要】 研究了新型混合固化剂二聚脂肪酸二异氰酸酯(DDI)/异佛尔酮二异氰酸酯(IPDI)固化端羟基聚丁二烯(HTPB)基聚氨酯的力学性能及其在PBX炸药中的应用。结果表明,当混合固化剂中DDI与IPDI的异氰酸酯基(NCO)的摩尔比为1/3时,HTPB基聚氨酯的拉伸强度和延伸率达到最大值(0.427 MPa和579.9%)。当DDI与IPDI的NCO摩尔比为1/1时,聚氨酯的压缩失效载荷最高。DDI/IPDI固化的HTPB基聚氨酯的延伸率是甲苯二异氰酸酯(TDI)固化聚氨酯的2.51倍。DDI/IPDI固化的PBX炸药的压缩率比使用TDI提高57.3%。使用DDI/IPDI时,PBX药片撞击感度试验和药片剪切试验的反应阈值提高了0.25 m以上,PBX的撞击安全性得到改善。更多还原

【Abstract】 The mechanical properties of hydroxyl terminated polyisobutylene( HTPB)-based polyurethane cured by a new mixed curing agent composed of isophorone diisocyanate( IPDI) and dimeryl diisocyanate( DDI) and its application in PBX were studied. Results show that when the molar ratio of isocyanate group( NCO) in the mixture of DDI / IPDI is 1 /3,the tensile strength and elongation of HTPB-based polyurethane reach the maximum value of 0. 427 MPa and 579. 9%. When the molar ratio of NCO in DDI and IPDI is 1 /1,the compressive failure load of polyurethane reaches the maximum. The elongation of HTPB-based polyurethane cured by DDI / IPDI is 2. 51 times greater than that of HTPB-based polyurethane cured by toluene diisocyanate( TDI). In comparison with the compression ratio of HTPB-based polyurethane cured by TDI,the compression ratio of HTPB-based polyurethane cured by DDI / IPDI increases by 57. 3%. The critical response threshold of impact sensitivity test and shear test for PBX tablets cured by DDI / IPDI increases more than 0. 25 m,indicating that the impact safety of PBX is improved.更多还原