低蓄热聚氨酯–超细水泥注浆材料的制备和性能研究

Study on the Preparation and Performance of Low Thermal Storage Polyurethane-Ultrafine Cement Grouting Materials

摘要: 针对深部高温矿井裂隙水渗流加剧热害的问题，本研究旨在开发一种兼具良好可注性、力学强度与隔热功能的新型注浆材料。通过正交试验系统研究了水灰比、聚氨酯掺量和减水剂用量对低蓄热聚氨酯与超细水泥浆液性能的影响。结果表明，影响材料综合性能的主次因素顺序为：水灰比 > 聚氨酯掺量 > 减水剂。确定最佳配比方案为水灰比0.25、聚氨酯添加量5 wt%和减水剂添加量0.1 wt%。XRD和SEM分析表明，相变材料(CPCMs)成功被引入到水泥基体中，聚氨酯与水反应生成凝胶体与水化硅酸钙(C-S-H)等产物形成互传网络结构，该结构显著提升了材料的致密性和耐久性。本研究为高温矿井注浆工程提供了一种性能优化的复合材料解决方案。

Abstract: To address the intensified thermal hazard caused by fissure water seepage in deep high-temperature mines, this study aims to develop a novel grouting material that integrates excellent injectability, mechanical strength, and thermal insulation properties. Through orthogonal experiments, the effects of water-cement ratio, polyurethane content, and water-reducing agent dosage on the performance of a low-heat-accumulation polyurethane and ultrafine cement slurry were systematically investigated. The results indicate that the order of significance of factors affecting the overall performance of the material is: water-cement ratio > polyurethane content > water-reducing agent. The optimal mix proportion was determined as follows: water-cement ratio of 0.25, polyurethane content of 5 wt%, and water-reducing agent dosage of 0.1 wt%. XRD and SEM analyses demonstrate that the phase change materials (PCMs) were successfully incorporated into the cement matrix. The reaction between polyurethane and water produced gel-like substances, which formed an interpenetrating network structure with hydration products such as calcium silicate hydrate (C-S-H), significantly enhancing the material’s compactness and durability. This research provides a composite material solution with optimized performance for grouting engineering in high-temperature mining environments.