硅烷偶联剂对矿用聚氨酯/粉煤灰加固材料压缩强度的影响

Effect of Silane Coupling Agent on Compressive Strength of Min-used Polyurethane/Fly Ash Reinforced Materials

针对煤矿井下岩体破碎,冒顶片帮等事故的发生,以聚醚多元醇、多亚甲基多苯基异氰酸酯、粉煤灰(FA)、阻燃剂TCPP、硅烷偶联剂(MPS)为基本原料,通过原味聚合法制备出聚氨酯/粉煤灰(PU/FA)加固材料。在此基础上,探究了最优的粉煤灰掺量及3-甲基丙烯酰氧基丙基三甲氧基硅烷(MPS)添加剂量。在最优条件下,通过扫描电镜和粒度分析仪,分别研究了PU/FA复合材料的微观形貌及粒度分布并进行对比。同时,研究了不同养护时间下PU、PU/FA-0%和PU/FA-2.5%对加固材料压缩强度的影响。结果表明:粉煤灰能有效填入聚氨酯基体中且当掺量为20%强度最优,添加2.5%的MPS不仅能有效促进粉煤灰颗粒的细化及在聚氨酯基体中的分散,还能进一步改善无机粉煤灰与有机聚氨酯两相间的界面性质与交联密度。

For the occurrence of accidents such as crushing of rock mass under the coal mine and roof caving and rib spalling,the polyether polyol,polymethylene polyphenyl isocyanate,fly ash,flame retardant TCPP,silane coupling agent are used as the basic raw materials,and the original polymerization is carried out.The Polyurethane and fly ash reinforcing material was prepared by the original flavor polymerization method.On this basis,the optimal amount of fly ash and the amount of 3-methacryloxy-propyl trimethoxy silane(MPS)additive were explored.Under the optimal conditions,the microstructure and particle size distribution of PU/FA composites were studied and compared by scanning electron microscopy and particle size analyzer.At the same time,the effects of compressive strength on PU,PU/FA-0%and PU/FA-2.5%reinforcement materials under different curing time were studied.The results show that the fly ash can be effectively filled into the polyurethane matrix and the strength is optimal when the content is 20%.Adding 2.5%MPS can not only effectively promote the refinement of the fly ash particles and the dispersion in the polyurethane matrix.It can further improve the interfacial properties and crosslink density between the inorganic fly ash and the organic polyurethane.