TY - JOUR A2 - Castaño, Victor M. AU - Shen, Jianjun AU - Ren, Baihui AU - Liu, Weitao AU - Gao, Chuanpeng AU - Hu, Yingying AU - Cao, Qing PY - 2020 DA - 2020/12/23 TI -放热，发泡优化，SP - 2849609 VL - 2020 AB -采空区封堵墙充填材料的力学性能研究但在严重的采动应力作用下，采空区的密封壁易发生裂缝或断裂，导致采空区漏水漏风。以聚醚多元醇、催化剂、表面活性剂、扩链剂和增塑剂为B组分，研究了聚亚甲基多苯基多异氰酸酯(PAPI)和亚甲基二苯基二异氰酸酯(MDI)的组合，以优化其放热、发泡、研究了改性聚氨酯(PU)作为采空区封堵墙充填材料的力学性能。首先，采用动态采集系统对不同聚醚多元醇含量样品的反应温度进行监测;其次，研究了聚醚多元醇、催化剂和表面活性剂对发泡性能的影响;然后进行单轴压缩试验，获得压缩性能;最后，用扫描电子显微镜(SEM)观察了单轴压缩后的微观结构。结果表明，纯化学浆体的抗压强度和变形性能优于化学浆体与砂土组合。 The optimal mass ratio of polyether triols, polyether tetraols, catalysts, surfactants, chain extenders, and plasticizers is 11 : 9 : 1.0 : 0.5 : 1.2: 6 in component B due to the maximum reaction temperature of 121.4°C, the expansion ratio of 2.6, and the compressive strength of 7.97 MPa at the strain of 10% in this study. The research provides a solution for the construction of the sealing wall, which is of great significance to safety production in an underground coal mine. SN - 1687-8434 UR - https://doi.org/10.1155/2020/2849609 DO - 10.1155/2020/2849609 JF - Advances in Materials Science and Engineering PB - Hindawi KW - ER -