Qin Chuanrui, Lu Wei, He Zhenglong, Qi Guansheng, Li Jinliang, Hu Xiangming
State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao 266590, China.
College of Mining and Safety Engineering, Shandong University of Science and Technology, Qingdao 266590, China.
Polymers (Basel). 2019 Apr 24;11(4):741. doi: 10.3390/polym11040741.
In view of the accidents such as rock mass breakage, roof fall and coal slide in coal mines, polyurethane/mesoscopic fly ash (PU/MFA) reinforcement materials were produced from polymethylene polyphenylene isocyanate (PAPI), the polyether polyol, flame retardant, and MFA using stannous octanate as a catalyst. 3-Glycidoxypropyltrimethoxysilane (GPTMS) was grafted on MFA surface, aiming to improve the mechanical properties of PU/MFA composites. The analyses of infrared spectroscopy and compression resistance reveal that the GPTMS can be successfully attached to the surface of MFA, and the optimum modification dosage of GPTMS to MFA is 2.5 wt % (weight percent). On this basis, the effect of GPTMS on the mechanical properties of PU/MFA reinforcement materials during the curing process was systematically investigated through a compression test, a fracture toughness test, a three-point bending test, a bond property test, and a dynamic mechanics analysis. The results show that the compression property, fracture toughness, maximum flexural strength, and bond strength of PU/MFA composites increase by 21.6%, 10.1%, 8.8%, and 19.3%, respectively, compared with the values before the modification. Furthermore, the analyses of scanning electron microscope and dynamic mechanics suggest that the coupling agent GPTMS can successfully improve the mechanical properties of PU/MFA composites because it eliminates the stress concentration and exerts a positive effect on the crosslink density and hardness of PU/MFA composites.
针对煤矿中出现的岩体破碎、冒顶和煤体滑坡等事故，以聚亚甲基多苯基异氰酸酯（PAPI）、聚醚多元醇、阻燃剂和介观粉煤灰（MFA）为原料，以辛酸亚锡为催化剂制备了聚氨酯/介观粉煤灰（PU/MFA）增强材料。将3-缩水甘油氧基丙基三甲氧基硅烷（GPTMS）接枝到MFA表面，旨在提高PU/MFA复合材料的力学性能。红外光谱和抗压分析表明，GPTMS能成功附着在MFA表面，GPTMS对MFA的最佳改性用量为2.5 wt%（重量百分比）。在此基础上，通过压缩试验、断裂韧性试验、三点弯曲试验、粘结性能试验和动态力学分析，系统研究了GPTMS在固化过程中对PU/MFA增强材料力学性能的影响。结果表明，与改性前相比，PU/MFA复合材料的压缩性能、断裂韧性、最大弯曲强度和粘结强度分别提高了21.6%、10.1%、8.8%和19.3%。此外，扫描电子显微镜和动态力学分析表明，偶联剂GPTMS能够成功改善PU/MFA复合材料的力学性能，因为它消除了应力集中，对PU/MFA复合材料的交联密度和硬度产生了积极影响。
