Microcapsule for continuous self-repairing of coal mine wind plugging material crack, and preparation method thereof

Abstract

The invention provides a microcapsule for continuous self-repairing of a coal mine wind plugging material crack, and relates to the technical field of coal mine wind plugging material crack repairing.The microcapsule comprises a microcapsule core material and a microcapsule wall material, and the microcapsule core material is prepared from lyophilized bacterium powder and a substrate. Urease-producing bacteria are used to provide a method for protecting long-time survival of bacteria in a cement-based material, providing sufficient nutrients and reducing the influences of bacterium addition on the mechanical properties of the cement-based material. The microcapsule is prepared from the lyophilized bacterium powder and its substrate, and is added in the mixing process of the cement-based material, so once the concrete has a crack, the microcapsule is broken, and spores in the material are activated to perform normal metabolism and continuously induce calcium carbonate precipitation, soself-repairing of the crack in the coal mine wind plugging material is continuously achieved. The preparation method has the advantages of simplicity in operation, and realization of large-batch production.

Description

technical field [0001] The invention relates to the technical field of repairing cracks in coal mine air leakage plugging materials, in particular to a microcapsule capable of sustainably self-repairing coal mine air leakage plugging material cracks and a preparation method thereof. Background technique [0002] With the reform of coal mining technology, the application of non-coal pillar technologies such as gob-side entry retention and empty delivery entry has greatly increased the rate of air leakage in coal entryways, which has brought great difficulties to the management of spontaneously combusted coal seams. The work of plugging air leakage in coal entryways is very difficult important. At present, some commonly used spray plugging measures include cement materials, fly ash foam materials, polymer spray materials, colloids, foam materials and polymer elastomers. These materials have certain applications in different mining areas. played an important role. Among them,...

AI Technical Summary

Problems solved by technology

This method is to add urease-producing bacteria and its substrate to the cement-based material during the mixing process of the cement-based material. Due to the high alkalinity and high Ca 2+ Concentration, lack of nutrients, and pore shrinkage during hydration, it is difficult for biomineralization to be applied to crack repair of cement-based materials.

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