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以硅酸钠为硅源,通过对硅酸钠水解形成纳米SiO_2(nano SiO_2)的过程进行调控,得到含无定形nano SiO_2(nano A-SiO_2)、球状nano SiO_2(nano S-SiO_2)和层状六角形nano SiO_2(nano LH-SiO_2)的水溶胶。以异氰酸酯和高亲水性聚醚多元醇为原料,合成亲水性聚氨酯(HPU)预聚体,并实现其与硅溶胶的原位反应,制备nano SiO_2/HPU注浆复合材料。通过ATR-FTIR、TEM、SEM及力学性能测试,对nano SiO_2/HPU的结构和性能进行表征与测试。结果表明,成功实现了聚乙二醇(PEG)对硅酸钠水解生成nano SiO_2过程的调控,并且不同形态结构的nano SiO_2粒子对nano SiO_2/HPU注浆复合材料的力学性能影响不同。其中,nano S-SiO_2/HPU具有更高的压缩强度,nano LH-SiO_2/HPU具有更强的韧性。
By using sodium silicate as the silicon source, the process of hydrolyzing sodium silicate to form nano SiO 2 is controlled to obtain the nano-SiO 2 containing nano A-SiO 2, nano S-SiO 2 and the layer Aqueous hexagonal nano-SiO 2 (nano LH-SiO 2) hydrosol. HPH prepolymer was synthesized from isocyanates and highly hydrophilic polyether polyols and the in situ reaction with silica sol was carried out to prepare nano SiO 2 / HPU grouting composites. The structure and properties of nano SiO_2 / HPU were characterized and tested by ATR-FTIR, TEM, SEM and mechanical properties testing. The results showed that PEG was effective in controlling the hydrolysis of sodium silicate to nano SiO 2, and the effect of nano SiO 2 particles with different morphologies on the mechanical properties of nano SiO 2 / HPU grouting composites was different. Among them, nano S-SiO 2 / HPU has higher compressive strength and nano LH-SiO 2 / HPU has stronger toughness.