High-strength low-heat-release mining flame-retardant grouting reinforcement material and preparation method thereof

Abstract

The invention discloses a high-strength low-heat-release mining flame-retardant grouting reinforcement material and a preparation method thereof. The flame-retardant grouting reinforcement material is obtained through mixing and solidifying a component A and a component B which are two low-viscosity liquids, the component A is obtained through mixing 60-80 parts of an isocyanate prepolymer, 10-38 parts of a flame retardant and 2-3 parts of an antistatic agent, and the component B is obtained through mixing 30-40 parts of polyether polyol, 0.1-0.5 parts of a catalyst, 10-25 parts of a diluting agent, 10-30 parts of an epoxy resin and 10-25 parts of a phenolic resin. The flame-retardant grouting reinforcement material has a low reaction heat release during solidification and has a highest reaction temperature of below 110DEG C, the obtained reinforcement has a high strength and a good caking property with coal rocks, the bonding strength, the sand consolidating strength and the compressive strength of the material are not below 30MPa, not below 8MPa and not below 60MPa, and the grouting reinforcement material has an obviously higher flame retardation property than a simple polyurethane grouting material.

Description

1. Technical field [0001] The invention relates to a high-strength and low-exothermic flame-retardant grouting reinforcement material for mines and a preparation method thereof, which is particularly suitable for reinforcement of coal and rock masses under thick loose aquifers. 2. Background technology [0002] There is a layer of loose aquifer composed of non-cemented sandy soil and glutenite at the bottom of the Quaternary thick topsoil layer in many coal mines in East China, North China and other mining areas. On the interface, the second is high water pressure. Affected by the combined effect of mining mine pressure and high water pressure, coal mining face is prone to disaster-causing accidents such as frame crushing and water inrush. At present, the coal mine industry mainly adopts chemical grouting reinforcement technology, which uses air pressure to inject chemical grouting materials evenly into the coal and rock mass with cracks. The slurry cements the coal and roc...

AI Technical Summary

Problems solved by technology

Although the solidification time of polyurethane grouting materials can be adjusted, compared with other organic grouting materials, it has great advantages in adhesive performance and compressive strength, but its isocyanate reacts violently with water under the aquifer and foams violently. As a result, the strength of the consolidated body is low, the heat of reaction is large, the maximum reaction temperature is high, and the flame retardancy is reduced; and the excessive heat of reaction will cause the water in the underground mine to vaporize and form water mist, which will affect the normal production operation; It will change the physical and chemical properties of coal, or even deteriorate

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