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| Microstructure and Mechanical Property of Polyurethane/Water Glass Grouting Materials during Curing Process |
ZENG Zhipeng1,2, SONG Xiaoyan3, SUN Yong1, SONG Shuanglin1, LU Wei2( ), HE Zhenglong2() |
1.State Key Laboratory of Coal Mine Safety Technology, China Coal Technology &Engineering Group Shenyang Research Institute, Fushun 113122, China
2.College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266590, China
3.China Institute of Water Resources and Hydropower Research, Beijing 100038, China |
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Cite this article:
ZENG Zhipeng, SONG Xiaoyan, SUN Yong, SONG Shuanglin, LU Wei, HE Zhenglong. Microstructure and Mechanical Property of Polyurethane/Water Glass Grouting Materials during Curing Process. Chinese Journal of Materials Research, 2022, 36(11): 855-861.
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Abstract The microstructure and macroscopic mechanical property of polyurethane/sodium silicate grouting materials during curing process were studied by means of scanning electron microscopy, energy dispersive spectroscopy, transmission/diffuse reflectance infrared spectroscopy and mechanical testing. The results show that: within the first 7 days, the compressive strength, fracture toughness and bending strength of the polyurethane/sodium silicate grouting material increased rapidly up to 55.4 MPa, 1025.3 MPa·m1/2 and 29.4 MPa, afterwards, they slowly increased to 58 MPa, 1220.4 MPa·m1/2 and 37.4 MPa respectively; the macroscopic mechanical properties of grouting materials mainly depend on the degree of crosslinking-curing of organic phases; the curing process of the grouting material involves the continuous exchange of water, carbon dioxide and heat between the organic phase and sodium silicate, and finally forms the polyurethane/sodium silicate composite composed of polyurea/polyurethane, which was resulted from the reaction of polyisocyanate with water and polyether polyol and silicate particles cured by sodium silicate gel.
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Received: 16 August 2021
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| Fund: National Basic Research Program of China(2018YFC0807900);National Natural Science Foundation of China(52004148);Natural Science Foundation of Shandong Province(ZR2020QE127);Open Project Funding of the State Key Laboratory of Coal Mine Safety Technology(2020-KF-23-05) |
About author: HE Zhenglong, Tel: (0554)6679917, E-mail: hzl_safety@sdust.edu.cn
LU Wei, Tel: (0554)6679917, E-mail: weilu@sdust.edu.cn
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