摘要
以甲苯二异氰酸酯和亲水性聚醚为原料,纳米SiO_(2)为改性填料,通过预聚体法制备了不同纳米SiO_(2)掺杂量的聚氨酯注浆材料,研究了纳米SiO_(2)掺杂量对聚氨酯注浆材料形貌结构、凝胶时间、发泡率和抗压强度等性能的影响。结果表明,纳米SiO_(2)表面的羟基基团和NCO基团发生了反应,形成键合,降低了NCO基团吸收峰的强度;纳米SiO_(2)的掺杂改善了聚氨酯注浆材料的完整性,孔径分布变均匀;随着纳米SiO_(2)掺杂量的增加,聚氨酯注浆材料的黏度、发泡率和抗压强度均先升高后降低,凝胶时间和保水性时间均先减小后增大,而固含量持续增大。当纳米SiO_(2)的掺杂量为0.6%(质量分数)时,黏度、发泡率和抗压强度达到最大值,分别为1545.2 mPa·s、1164.3%和0.118 MPa,凝胶时间和保水性时间达到最短,分别为115和127 s。综合可知,掺杂0.6%(质量分数)纳米SiO_(2)的聚氨酯注浆材料各项性能最优,在防渗止漏、填充孔隙和提高建筑物整体能方面具有巨大的应用潜力。
Polyurethane grouting materials with different doping amounts of nano-SiO_(2) were prepared by prepolymer method with toluene diisocyanate and hydrophilic polyether as raw materials and nano-SiO_(2) as modified filler.The effects of nano-SiO_(2) content on the morphology,gelation time,foaming rate and compressive strength of polyurethane grouting materials were studied.The results showed that the hydroxyl group on the surface of nano-SiO_(2) reacted with NCO group to form bond,which reduced the intensity of NCO group absorption peak.The doping of nano-SiO_(2) improved the integrity of polyurethane grouting material,and the pore size distribution became uniform.With the increase of SiO_(2) content,the viscosity,foaming rate and compressive strength of polyurethane grouting materials increased first and then decreased,and the gel time and water retention time decreased first and then increased,while the solid content increased continuously.When the doping amount of nano-SiO_(2) was 0.6wt%,the viscosity,foaming rate and compressive strength reached the maximum value of 145.2 mPa·s,164.3%and 0.118 MPa respectively,and the gel time and water retention time reached the shortest,115 and 127 s respectively.It can be seen that the polyurethane grouting material doped with 0.6 wt%nano-SiO_(2) had the best performance,and great application potential in anti-seepage and leakage stopping,filling pores and improving the overall energy of buildings.
作者
师丽
SHI Li(School of Civil Engineering,Yulin University,Yulin 719000,China)
出处
《功能材料》
CAS
CSCD
北大核心
2022年第8期8221-8225,共5页
Journal of Functional Materials
基金
国家自然科学基金项目(51868075)
陕西省教育厅专项科研计划项目(18JK0910)
榆林市高新区科技计划项目(CXY-2021-47)。
