A bionic self-healing material for air leakage plugging in coal mines

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 invention relates to the technical field of coal mine air leakage plugging materials, in particular to a coal mine air leakage plugging bionic self-healing material. Background technique [0002] Coal spontaneous combustion is one of the major hidden dangers of coal mine safety production in my country. Fires caused by coal spontaneous combustion not only cause a large number of casualties and serious economic losses, but also cause large-scale environmental pollution, vegetation destruction, soil desertification and other problems. Air leakage is one of the important causes of coal spontaneous combustion, and filling and plugging air leakage is a key technology to prevent coal seam spontaneous combustion. Therefore, it is of great significance to develop economical, practical, green and environment-friendly wind blocking materials to improve the fire prevention and extinguishing level of coal and ensure the safe production of coal. [0003] At p...

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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