聚氨酯是聚氨基甲酸酯的简称。它具有质轻、防潮、隔热、保温、吸音、抗腐、绝缘、密封性好、粘结性强、凝固快等性能。封孔是煤矿抽放瓦斯中一项重要的技术工艺。封孔好坏直接影响到抽放瓦斯量和抽放效率。为了做到严密封孔,多抽瓦斯,因 Polyurethane is a short form of polyurethane. It has light, moisture, heat insulation, thermal insulation, sound-absorbing, anti-corrosion, insulation, sealing, bonding, fast solidification performance. Sealing is an important technology in coal mine gas drainage. Sealing a good or bad directly affects the amount of gas drainage and drainage efficiency. In order to achieve a tight seal, more gas, because