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以异氰酸酯和高亲水性聚醚多元醇为原料,合成了亲水性聚氨酯预聚体浆液,并利用硅酸钠为硅源和预聚体反应,原位制备了纳米二氧化硅增强亲水性聚氨酯注浆材料固结体。应用FTIR-ATR、XRD和TEM对固结体的结构与性能进行了测试与表征,探讨了原位生成的纳米二氧化硅对亲水性聚氨酯注浆材料固结体性能的影响。结果表明,原位生成的纳米二氧化硅均匀的分散在聚氨酯中,并与聚氨酯网络以化学键方式结合,提高了固结体的力学性能。经过井下堵水中试工程试验以及后续的观察,纳米二氧化硅增强聚氨酯复合材料具有较高的实际堵水效率。
Using isocyanates and highly hydrophilic polyether polyols as raw materials, a hydrophilic polyurethane prepolymer slurry was synthesized. Using sodium silicate as a silicon source and prepolymer reaction, a nano-silica reinforced hydrophilic Polyurethane grouting material consolidation. The structure and properties of the composites were tested by FTIR-ATR, XRD and TEM. The effects of the in-situ nanosilica on the properties of the hydrated polyurethane grouts were investigated. The results show that the in-situ nano-silica is uniformly dispersed in the polyurethane and chemically bonded with the polyurethane network to improve the mechanical properties of the consolidated body. After underground plugging pilot project test and follow-up observation, nano-silica reinforced polyurethane composite material has a high actual water plugging efficiency.