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改性丙烯酸微裂隙堵水固砂注浆材料的制备与性能

Preparation and performance of modified acrylic sand consolidation and water blocking grouting material

  • 摘要: 针对传统无机水泥基灌浆材料在封堵细微孔隙方面的局限性以及化学灌浆材料(如聚氨酯和环氧树脂)在耐久性、成本和环境影响方面的不足,开发了一种新型改性丙烯酸灌浆材料,该注浆材料不仅渗透力强、可灌性好,而且成本低廉。研究了缓凝剂用量和反应温度对改性丙烯酸盐灌浆材料凝胶时间的影响,以期优化配方以适应不同的工程条件。通过调整乳液质量分数,评估了浆液的固砂体抗压强度、断裂伸长率和贮存稳定性,并确定了最佳乳液质量分数为20%。此外,比较了不同玻璃化转变温度的丙烯酸乳液对灌浆材料性能的影响,以扩展其应用范围。结果表明:在含水砂层条件下,当浆液含水量低于89%时,固砂堵水效果最佳。在不同pH值的水环境中,浆液的反应速率在酸性环境下较慢,而在碱性环境下最快。制备的改性丙烯酸灌浆材料能够有效地进行固砂堵漏,确保封堵后的砂岩保持优异的抗压强度,为煤矿安全开采提供了一种新的技术途径。

     

    Abstract: A new kind of modified acrylic grouting material has been developed to address the limitations of traditional inorganic cement-based grouting materials in sealing fine pores, as well as the shortcomings of chemical grouting materials such as polyurethane and epoxy resin in terms of durability, cost, and environmental impact. This grouting material not only has strong permeability and good groutability, but also has low cost. The effects of retarder dosage and reaction temperature on the gel time of modified acrylate grouting material were studied in order to optimize the formula to adapt to different engineering conditions. By adjusting the mass fraction of lotion, the compressive strength, elongation at break and storage stability of sand consolidation body of slurry were evaluated, and the optimal mass fraction of lotion was determined to be 20%. In addition, the influence of acrylic lotion with different glass transition temperature on the properties of grouting materials was compared to expand its application range. The results show that under the condition of water bearing sand layer, the best sand consolidation and water blocking effect is achieved when the water content of the slurry is below 89%. In water environments with different pH values, the reaction rate of the slurry is slower in acidic environments and fastest in alkaline environments. The prepared modified acrylic grouting material can effectively fix sand and seal leaks, ensuring that the sealed sandstone maintains excellent compressive strength, providing a new technological approach for safe mining in coal mines.

     

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