Research progress on modification of polyurethane grouting materials for coal mines

LI Yang; CHEN Guifeng; WANG Yuchao; YU Xiaofeng; LI Shuolin

doi:10.3969/j.issn.1007-7677.2025.01.002

Abstract：Polyurethane grouting material for coal mine,as a kind of organic polymer material widely used in coal min-ing,is used in the field of coal mine safety such as grouting reinforcement,water plugging and filling,etc.However,the existing polyurethane grouting material has shortcomings such as insufficient mechanical properties,poor flame re-tardant effect,and easy to cause fire by too high curing temperature in the underground application,etc.,which urgent-ly needs to be modified in order to enhance its application effect in the field of coal mine.The modification of polyure-thane grouting material is urgently needed to improve its application effect in coal mine field.In order to explore the safety problems faced by polyurethane grouting materials in underground applications,the modification methods of poly-urethane grouting materials were summarized systematically in recent years from the aspects of enhancing the mechanical properties,improving the flame retardant effect,lowering the curing temperature,and look forward to the direction of future research on modification of polyurethane grouting materials.At present,although the modification of polyurethane grouting materials can effectively improve the defects of single polyurethane grouting materials and perfect performance,all kinds of methods have their own advantages and disadvantages.The future development of polyurethane grouting ma-terial modification research should focus on the field of raw materials.Environmentally friendly raw materials(e.g.bio-mass,etc.)from a wide range of sources and at low cost can be selected to prepare polyols to replace traditional petrole-um-based polyols.The use of chemical copolymerization and other polymer material modification technology,the intro-duction of flame retardant elements into its molecular structure,the formation of synergistic superposition effect with the addition of flame retardant to achieve dual flame retardancy,and ultimately reach a balance between high strength,high flame retardancy and low curing temperature,to help improve the performance of material and expansion of applications.