以硅酸钠为硅源,通过对硅酸钠水解形成纳米SiO2(nano SiO2)的过程进行调控,得到含无定形nano SiO2(nano A-SiO2)、球状nano SiO2(nano S-SiO2)和层状六角形nano SiO2(nano LH-SiO2)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 SiO2/HPU注浆复合材料.通过ATR-FTIR、TEM、SEM及力学性能测试,对nano SiO2/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 SiO2过程的调控,并且不同形态结构的nano SiO2粒子对nano SiO2/HPU注浆复合材料的力学性能影响不同.其中,nano S-SiO2/HPU具有更高的压缩强度,nano LH-SiO2/HPU具有更强的韧性.
Three kinds of SiO2 sols containing amorphous nano-silica (nano A-SiO2),spherical nano-silica (nano S-SiO2),and layered hexagonal nano-silica (nano LH-SiO2) particles were controllably synthesized by tailoring the hydrolysis of sodium silicate.By in-situ reaction between SiO2 sols and hydrophilic polyurethane (HPU) prepolymer,synthesizing from diisocyanate and polyether polyol,a series of nano-silica modified hydrophilic polyurethane composites (nano SiO2/HPU) were obtained.The structure and properties of HPU and nano SiO2/HPU were characterized by ATR-FTIR,TEM,SEM and mechanical properties.The results show that PEG plays a regulating role in the formation of nano-silica particles in SiO2 sol,and the morphology of nano-silica particles affects the mechanical properties of nano SiO2/HPU grouting composites differently.Specifically,nano S-SiO2/HPU exhibits higher compression strength,and nano LH-SiO2/HPU possesses better toughness.
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