Development of new type of polyurethane grouting material and its application in coal seam water prevention and control
In order to reduce the cost of polyurethane grouting material,nano modifier CAG-1 was used as inorganic filler,combined with polyether polyol PTMG,toluene diisocyanate TDI,diphenylmethane diisocyanate MDI,tris(2-chloropropyl)phosphate TCPP,and dime-thyl methylphosphonate DMMP.A new type of polyurethane grouting material was developed using stannous octanoate as catalyst and citric acid as retarder,and the effect of nano modifier CAG-1 on the performance of a new polyurethane grouting material was investiga-ted.The results show that the higher the mass fraction of nano modifier CAG-1 is,the greater the density,viscosity and nonvolatile con-tent of the new polyurethane grouting material are,the longer the gel time and water inclusion property are,the smaller the foaming rate and water swelling rate are,and the compressive strength"first rises and then decreases"with the increase of the mass fraction of CAG-1.The best mass fraction of CAG-1 is recommended to be 5％.At this time,the new polyurethane grouting material prepared has good comprehensive performance.The on-site application results show that the use of new polyurethane grouting materials for diversion grou-ting and water blocking measures in 5 coal mine wells has achieved good water blocking effects,with water blocking rates reaching over 90％and a significant decrease in water inflow.The application effect is good.
mine wellwater prevention and controlgrouting materialpolyurethanenano modifier
万方数据
维普
