Nanometer material for plugging coal mines

Abstract

The invention discloses a nanometer material for plugging coal mines. The nanometer material consists of tricalcium aluminate, sodium nitrite, silicon dioxide, a propionate copolymerization solution, an adhesive and an additive. The nanometer material has a firm structure, is wide in application range and high in safety and can be used for anti-weathering coating of coal rocks of the coal mines, fissure filling, the cementation of loosened surrounding rocks, the anticorrosion of anchor belt nets of tunnels, the spraying and plugging of the surrounding rocks and the anti-oxidation spontaneous combustion of coal walls.

Description

technical field [0001] The invention relates to a coal mine roadway, in particular to a coal mine plugging nanometer material. Background technique [0002] At present, shotcrete is mainly used in coal mine roadways, but after decades of on-site observation and research, the main problems of shotcrete are as follows: (1) shotcrete has a large amount of rebound, poor environment and high cost; (2) shotcrete cannot be blocked Water spraying in the surrounding rock; (3) Due to the large size of the coarse aggregate, the shotcrete cannot fill the pores and cracks in the surrounding rock to make it a whole; (4) The shotcrete has poor compactness, and at the same time it is A large number of capillary gaps will be generated, which cannot prevent the intrusion of deliquescent air, carbon monoxide, hydrogen sulfide and chloride ions and other harmful gases in the roadway, so that the spray layer will not have an effective anti-corrosion effect on the anchor belt net; (5) when the ro...

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Problems solved by technology

[0002] At present, shotcrete is mainly used in coal mine roadways, but after decades of on-site observation and research, the main problems of shotcrete are as follows: (1) shotcrete has a large amount of rebound, poor environment and high cost; (2) shotcrete cannot be blocked Water spraying in the surrounding rock; (3) Due to the large size of the coarse aggregate, the shotcrete cannot fill the pores and cracks in the surrounding rock to make it a whole; (4) The shotcrete has poor compactness, and at the same time it is A large number of capillary gaps will be generated, which cannot prevent the intrusion of deliquescent air, carbon monoxide, hydrogen sulfide and chloride ions and other harmful gases in the roadway, so that the spray layer will not have an effective anti-corrosion effect on the anchor belt net; (5) when the roadway is supported , because the metal mesh and steel belt are in close contact with the surrounding rock, and the sprayed concrete layer is outside, once the surrounding rock is deformed or the dangerous rock moves, the metal mesh and steel belt are easy to crack the sprayed layer, so that the sprayed concrete layer cannot reach (6) The cohesive force between shotcrete and coal wall in coal roadway is small, and the weight of sprayed layer is easy to become the load suspended by metal mesh and steel belt, thus increasing the deflection deformation of metal mesh and steel belt, resulting in The shotcrete cannot achieve the purpose of supporting the surrounding rock and preventing weathering; (7) After the shotcrete in the coal roadway is thicker, the coal quality will be greatly affected when the working face is mined