Bionic self-healing material for air leakage stoppage in coal mine

Abstract

The invention relates to a bionic self-healing material for air leakage stoppage in a coal mine. The bionic self-healing material comprises a fast-setting expanding material, microcapsules containing a healing agent, and a catalyst, wherein the fast-setting expanding material comprises several of a cement clinker, coal ash, steel slag, mountain flour, salty mud, carbide slag, an expanding agent, a water reducing agent and sand, and each microcapsule is composed of a wall material (polymer resin) and a core material (the healing agent); the wall material of each microcapsule is at least one of urea resin, melamino-formaldehyde resin, melamine urea-formaldehyde resin and polyurethane, the healing agent is at least one of olefins containing double bonds, such as polyurethane prepolymer, isocyanate, phenolic resin, epoxy resin, styrene, acrylics and dicyclopentadiene (DCPD), and the catalyst is at least one of Grubbs catalyst, dibutyltin dilaurate and amines. The bionic self-healing material for air leakage stoppage in the coal mine disclosed by the invention has the advantages of being automatic in detection and healing, moderate in expansion, fast to set, good in conveying performance, strong in setting performance, green and environmentally friendly, and low in price.

Description

Technical field [0001] The present invention relates to the technical field of coal mine wind blocking materials, in particular to a coal mine wind blocking bionic self-healing material. Background technique [0002] Coal spontaneous combustion is one of the major hidden dangers of coal mine safety in our country. Fires caused by spontaneous combustion of coal not only cause a large number of casualties and serious economic losses, but also cause large-scale environmental pollution, vegetation destruction, and soil desertification. Air leakage is one of the important reasons for spontaneous combustion of coal. Filling and plugging the air leakage is the key technology to prevent spontaneous combustion of coal seams. Therefore, the research and development of economical, practical, green and environmentally-friendly wind blocking materials is of great significance for improving the level of coal fire prevention and extinguishing and ensuring safe coal production. [0003] At prese...

AI Technical Summary

Problems solved by technology

These filling and plugging materials play an important role in ensuring the safe production of mines, but there are still some problems: as the volume of gypsum slurry shrinks after dehydration, it is easy to cause poor sealing; the water glass-ammonium salt gel will release during use. Toxic gas pollutes the underground environment; materials such as ammonia-free gel, composite colloid, and colloidal mud solve the problem of ammonia pollution, but the sealing effect of these gel materials has a time limit, and the volume of the material shrinks after dehydration, resulting in Cracks cannot be permanently sealed; materials such as foam cement and solidified fly ash are low in cost, but their compression resistance is weak, and cracks are easy to form, forming air leakage channels

[0004] Air leakage plugging materials will inevitably produce a large number of micro-cracks under the action of mine pressure. If these cracks cannot be found and repaired in time, they will connect the goaf and form air leakage channels, which will easily lead to spontaneous combustion of coal seams in the goaf

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