将表面改性煤矸石粉(MCG)作为填料加入到聚氨酯中,通过室温固化制备改性煤矸石粉/聚氨酯(MCG/PU)复合注浆材料。结果表明:填料的表面改性改善了复合材料的界面相容性;随着MCG含量的增加,复合材料的抗压强度和最高反应温度均有明显下降,氧指数和固化时间有所上升。当MCG含量为30%时,复合材料的极限氧指数为23.5%,最高反应温度从138.3℃下降到116.8℃,抗压强度为51.8MPa,可在2min左右完成固化。相对于聚氨酯材料,MCG/PU复合材料在兼具快速固化和较高力学强度的情况下,具有更低的反应温度和更好的阻燃性能,有望应用于对氧指数要求不高的加固场景如边坡加固及道路加固等。
The surface-modified coal gangue powder (MCG) was added to polyurethane as filler,and the modified coal gangue powder/polyurethane (MCG/PU) composite grouting material was prepared by solidification at room temperature.The results showed that the surface modification of fillers improved the interfacial compatibility of the composite material.With the increase of MCG mass fraction,the compressive strength and maximum reaction temperature of the composite material decreased obviously,while the oxygen index and curing time increased.When the MCG content was 30%,the limiting oxygen index of the composite material was 23.5%,the maximum reaction temperature was reduced from 138.3℃ to 116.8℃,the compressive strength was 51.8MPa,and the solidification could be completed in about 2 minutes.Compared with polyurethane materials,MCG/PU composite materials had a lower reaction temperature and better flame retardancy while combining rapid curing and high mechanical strength,and were expected to be applied to reinforcement scenarios with low oxygen index requirements,such as slope reinforcement and road reinforcement.
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基金资助
国家自然科学基金区域创新发展联合基金重点项目(U22A20151);山西浙大新材料与化工研究院研发项目(2021SX-TD008和2021SX-TD010);太原市关键核心技术“揭榜挂帅”项目(并财教[2024]29号);山西省“1331”工程(晋财绩[2021]1号)
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