Properties of nanosilica-reinforced polyurethane by in-situ preparation and its application in polyurethane grouting
LI Ya-di1, LI Jia-jin1, CHEN Ding-ding1, FAN Ren-xiang1, SANG Guo-long1, NI Jian-ming2, DING Yun-sheng1,3
1. Institute of Polymer Materials and Chemical Engineering, School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei 230009, China; 2. Huaibei Mining ( Group)Co., Ltd., Huaibei 235000, China; 3. Key Laboratory of Advanced Functional Materials and Devices, Hefei 230009, China
Abstract：The prepolymer of hydrophilic polyurethane is synthesized by diisocyanate and polyether polyol, and then the polyurethane prepolymer blends with sodium silicate solution to prepare nanosilica-reinforced hydrophilic polyurethane composites (HPU/nano-SiO2) via in-situ reactions. The FTIR-ATR and X-ray diffraction (XRD) are employed to confirm the existence of the nano-SiO2 and its chemical bond to HPU chain, and the size and dispersion of nano-SiO2 in HPU matrix are investigated by transmission electron microscopy (TEM). The gel time of the mixture consisting of HPU prepolymer and sodium silicate solutions and the mechanical properties of HPU/nano-SiO2 composites are also tested. The results show that the particles of nano-SiO2 disperse homogeneously in the HPU matrix, and the nano-SiO2 combines with HPU chains by chemical bonds to form HPU/nano-SiO2 composites. What’s more, the gel time of HPU and sodium silicate solution blend increases compared to that of the blend of HPU and water, and the compression strength of HPU/nano-SiO2 is improved effectively than that of pristine HPU, so the HPU prepolymer can react with sodium silicate solutions to produce the nanosilica reinforced hydrophilic polyurethane grout, which has high ability and efficiency to form adequate plugs for underground water though the plugging project of coal mine.
李雅迪, 李嘉晋, 陈丁丁, 范仁祥, 桑国龙, 倪建明, 丁运生. 纳米二氧化硅原位增强亲水性聚氨酯注浆材料的制备与性能研究[J]. 岩土工程学报, 2016, 38(zk1): 83-86.
LI Ya-di, LI Jia-jin, CHEN Ding-ding, FAN Ren-xiang, SANG Guo-long, NI Jian-ming, DING Yun-sheng. Properties of nanosilica-reinforced polyurethane by in-situ preparation and its application in polyurethane grouting. Chinese J. Geot. Eng., 2016, 38(zk1): 83-86.
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