Zhang Xuanning, Wang Ende, Ma Sishun, Zhang Deqing
Department of Geology, College of Resources and Civil Engineering, Northeastern University, Shenyang 110819, China.
Materials (Basel). 2024 Aug 28;17(17):4245. doi: 10.3390/ma17174245.
With the increasing drilling depth of mines, the cross-complexity of fissures in the rock body, and the frequent occurrence of sudden water surges, polymer slurry, with its advantages of good permeability and strong water plugging, is increasingly used in mine grouting projects. Additional research is needed in order to further improve the grouting performance of polymer slurry, ensure the safety of mining operations, and reduce the grouting cost. In this paper, a polymer composite grouting material was prepared with diphenyl methyl diisocyanate, polyether polyol, and fly ash, as the main raw materials, with coupling agent and catalyst as auxiliary reagents. The performance of the composite grouting material in terms of mechanical properties, thermal stability, hydrophobicity, and bonding was explored. This study's findings indicated that incorporating fly ash led to notable enhancements in the thermal stability and water resistance of the polymer slurry. Furthermore, the introduction of fly ash notably raised the starting degradation temperature of the polymer, boosted the water contact angle of the composite material, and reduced the density and reaction temperature of the composite material. In addition, the catalyst and coupling agent as auxiliary reagents affected the polymers in terms of mechanical properties; in this paper, dibutyltin dilaurate was used as the catalyst, and organosilanes were used as the coupling agent. The catalyst successfully sped up the polymer's gel time, however, an excessive quantity of catalyst compromised the polymer's mechanical characteristics. The addition of organosilanes has a positive effect on the dynamic mechanical properties of the composites, fracture toughness, compression, bending, and bond strength. The research can offer a theoretical direction for creating polymer mixtures in mine grouting projects.
随着矿山开采深度的增加，岩体裂隙交叉复杂程度提高，突水事故频发，具有良好渗透性和强堵水性能的聚合物浆液在矿山注浆工程中的应用越来越广泛。为进一步提高聚合物浆液的注浆性能、保障开采作业安全并降低注浆成本，仍需开展更多研究。本文以二苯基甲基二异氰酸酯、聚醚多元醇和粉煤灰为主要原料，以偶联剂和催化剂为辅助试剂，制备了一种聚合物复合注浆材料。探究了该复合注浆材料在力学性能、热稳定性、疏水性和粘结性方面的性能。研究结果表明，掺入粉煤灰可显著提高聚合物浆液的热稳定性和耐水性。此外，粉煤灰的引入显著提高了聚合物的起始降解温度，增大了复合材料的水接触角，并降低了复合材料的密度和反应温度。另外，作为辅助试剂的催化剂和偶联剂对聚合物的力学性能有影响；本文中，二月桂酸二丁基锡用作催化剂，有机硅烷用作偶联剂。催化剂成功加快了聚合物的凝胶时间，然而，过量的催化剂会损害聚合物的力学性能。有机硅烷的添加对复合材料的动态力学性能、断裂韧性、抗压、抗弯和粘结强度有积极影响。该研究可为矿山注浆工程中聚合物混合料的制备提供理论指导。
