Hou Kai, Wang Shuai, Yao Xin, Yao Shun, Zhou Xinxing, Ma Jianchao, Wang Pengfei, Feng Guorui
College of Mining Engineering, Taiyuan University of Technology, Taiyuan 030024, China.
Key Laboratory of Shanxi Province for Mine Rock Strata Control and Disaster Prevention, Taiyuan University of Technology, Taiyuan 030024, China.
Polymers (Basel). 2023 Nov 17;15(22):4449. doi: 10.3390/polym15224449.
When it comes to grouting in coal mines, polyurethane (PU) is often utilized. However, it is of vital importance to consistently improve the mineral PU, considering the significant amount of environmental deterioration to which it is prone. Laboratory experiments were used to model various coal mine conditions. Additionally, a workable technique for PU strengthening using ultrasonic waves was proposed. Compression tests and scanning electron microscopy (SEM) were used to describe the PU-gangue material's induration characteristics. The results showed that ultrasound has a positive impact on PU's mechanical strength. The final strength of the PU was significantly impacted by the size of the coal gangue particles, the amount of dust, and the amount of water. The induration made of gangue and PU with the same mass but differing particle sizes was noticeably different in its compressive strength. The strengthening mechanism showed that the average size of the rigid foam after the ultrasound treatment was smaller, and the 'honeycomb'-structured space in the inner section was more compact, resulting in the rigid PU foam having a higher compressive strength after ultrasound treatment. Furthermore, the dust content and water content of coal mines need to be controlled within a specific range to ensure the effective use of PU grouting materials.
在煤矿注浆方面，常使用聚氨酯（PU）。然而，鉴于其容易导致大量环境恶化问题，持续改进矿物PU至关重要。利用实验室实验模拟各种煤矿条件。此外，还提出了一种可行的利用超声波强化PU的技术。采用压缩试验和扫描电子显微镜（SEM）来描述PU - 煤矸石材料的硬结特性。结果表明，超声波对PU的机械强度有积极影响。PU的最终强度受煤矸石颗粒大小、粉尘量和水量的显著影响。由相同质量但不同粒径的煤矸石和PU制成的硬结物，其抗压强度明显不同。强化机制表明，超声波处理后硬质泡沫的平均尺寸较小，内部“蜂窝”结构空间更紧凑，导致超声波处理后的硬质PU泡沫具有更高的抗压强度。此外，需要将煤矿的粉尘含量和含水量控制在特定范围内，以确保PU注浆材料的有效使用。
