College of Safety Science and Engineering, Xi’an University of Science and Technology
School of Safety Engineering, ChinaUniversity of Mining and Technology(Xuzhou)
State Key Laboratory of Mining Response and Disaster Prevention and Control inDeep Coal Mines
College of Safety Science and Engineering, Anhui University of Science and Technology

煤矿瓦斯抽采钻孔密封材料的性能在改善钻孔密封质量、提高瓦斯抽采效率等方面起着至关重要的作用。为了改变传统水泥基钻孔密封材料在水化初期发生无效膨胀的问题,采用理论研究、物理试验与测试相结合的方式,提出了利用微胶囊技术延缓密封材料膨胀时间的方法。实验确定了以乙基纤维素 (EC) 作为囊壁材料、蒙脱石 (MMT) 为囊芯材料,以相分离法制备延迟膨胀微胶囊,并通过单因素实验与响应曲面分析法 (RSM) 得出各关键参数之间的交互作用,结果表明各关键参数对包封率的影响程度大小排序为:搅拌速率>芯壁比>聚乙烯 (PE) 用量。此外,根据 Design-Expert 软件得出微胶囊制备的最优参数为:芯壁比为 0.8,PE 用量为 1.5%、搅拌速率为 400 r/min。最后,通过自主设计的模拟钻孔密封性能实验表明:延迟膨胀密封材料相较于普通膨胀材料具有更好的密封性能,其有效密封时间可提高 60% 左右。

The performance of coal-mine gas extraction borehole sealing material plays an important role in improving the quality of sealing in gas extraction boreholes and the efficiency of gas extraction. To address the issue of the ineffective expansion of traditional cementbased sealing materials in the initial stage of hydration, microcapsule technology was proposed to delay the expansion time of sealing materials by combining theoretical research, physical experiment. The experiment determined that delayed-expansion microcapsules wereprepared by phase separation with ethyl cellulose (EC) as the capsule wall material and montmorillonite (MMT) as the core material.Moreover, according to the single factor experiment and response surface method (RSM), the interactions of various factors were determined. Experiment results showed that the significance order of the influencing factors was: stirring speed> ratio of core to wall> dosage ofpolyethylene (PE). Then, the optimal parameters for the preparation of microcapsules based on design-expert software were acquired: theratio of core to wall was 0.8, the dosage of PE was 1.5%, the stirring rate was 400 r/min. Finally, the results of self-designed simulation experiment on the borehole sealing showed that delayed expansion sealing material has better sealing performance than ordinary expansionmaterial, and its effective sealing time can be increased by about 60%.

国家自然科学基金资助项目(52174203,51974241,51734007)

张超, 范富槐, 李树刚, 等. 基于微胶囊技术的瓦斯抽采钻孔密封材料研究[J]. 煤炭科学技术, 2023, 51(4): 72-79.

ZHANG Chao, FAN Fuhuai, LI Shugang. Research on gas drainage borehole sealing material based on microcapsule technology[J].Coal Science and Technology, 2023, 51(4): 72-79.