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.
[1] Naudts. Irreversible changes in the grouting industry caused by polyurethane grouting[C]// An Overview of 30 years of polyurethane Grouting. Grouting and ground Treatment- Proceedings of 3rd International specialty Conference on Grouting and Treatment, 2003. [2] XIANG X J, QIAN J W, YANG W Y, et al. Synthesis and properties of nanosilica-reinforced polyurethane for grouting[J]. Journal of Applied Polymer Science, 2006, 100: 4333-4337. [3] PHUA S L, YANG Li-ping, TOH C L, et al. Reinforcement of polyether polyurethane with dopamine-modified clay: the role of interfacial hydrogen bonding[J]. Appl Mater Interfaces, 2012(4): 4571-4578. [4] ZHANG Li-hui, ZHANG Hong, GUO Jin-shan. Synthesis and properties of uv-curable polyester-based waterborne polyurethane/functionalized silica composites and morphology of their nanostructured films[J]. Industrial & Engineering Chemistry Research, 2012, 51: 8434-8441. [5] 朱 锦, 李雅迪, 孙晓红, 等.以TDI为扩链剂合成亲水性聚氨酯注浆堵水材料研究[J]. 中国建筑防水, 2014, 12: 23-26. (ZHU Jin, LI Ya-di, SUN Xiao-hong, et al. Study on synthesis of hydrophilic polyurethane grouting and water-blocking material with TDI as chain extender[J]. China Building Waterproofing, 2014, 12: 23-26. (in Chinese))