Coal mine roadway spraying material and preparation method thereof

Abstract

The invention discloses a coal mine roadway spraying material, relates to the technical field of new materials for mines, and comprises two layers of a base layer and a surface layer, and the base layer is made of the following raw materials in parts by weight: Portland cement 25-35 parts, pulverized coal 25-35 parts of ash, 8-12 parts of clay, 4-8 parts of latex powder, 10-15 parts of fiber reinforced materials, 0.2-0.3 parts of styrene-acrylic emulsion, 0.1-0.2 parts of polyvinyl alcohol, 1-2 parts of water glass and 35-42 parts of water, the surface layer is a polyurethane layer, which has excellent support performance, anti-corrosion and anti-leakage, and can further ensure the safe production of coal mines.

Description

technical field [0001] The invention relates to the technical field of new materials for mines, in particular to a coal mine roadway spraying material and a preparation method thereof. Background technique [0002] Coal mine strata are mostly coal rock, mudstone, sandstone or clay rock, etc., with poor mechanical properties, poor stability, easy weathering, and very easy to absorb water and deliquescence or expand. If not treated, it will easily lead to roadway instability and damage; and some The roadway needs to pass through the goaf of the coal seam, and there is a large amount of CH in the goaf 4 , CO and other harmful gases, roadway ventilation can easily lead to gas gushing out of the goaf, so it is necessary to control the air leakage problem in the roadway; in addition, the coal seam of the roadway has a high sulfur content and a high tendency of spontaneous combustion, so most mine roadways will be sprayed on the wall , the main spraying materials are concrete mate...

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Problems solved by technology

[0002] Coal mine strata are mostly coal rock, mudstone, sandstone or clay rock, etc., with poor mechanical properties, poor stability, easy weathering, and very easy to absorb water and deliquescence or expand. If not treated, it will easily lead to roadway instability and damage; and some The roadway needs to pass through the goaf of the coal seam, and there is a large amount of CH in the goaf 4 , CO and other harmful gases, roadway ventilation can easily lead to gas gushing out of the goaf, so it is necessary to control the air leakage problem in the roadway; in addition, the coal seam of the roadway has a high sulfur content and a high tendency of spontaneous combustion, so most mine roadways will be sprayed on the wall , the main spraying materials are concrete materials and chemical spraying materials. The main components of concrete materials are concrete and fly ash. In the complex environment of the roadway, the free alkali in the concrete is easy to precipitate and the surface is prone to alkali corrosion, and the waterproof performance is relatively poor, the toughness is not high, cracks are easy to appear after water loss, and the risk of air leakage is relatively high; the chemical spraying material is commonly used polymer Resin material has better air blocking effect, high cohesiveness, and certain deformability, but its use cost is relatively high, waterproof performance is poor, and the coating is greatly affected by wall dust

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