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

A technology of material cracks and microcapsules, which is applied to the direction of bacteria and bacteria fixed on or in the inorganic carrier, can solve the problems of biomineralization and repair of cracks in cement-based materials, and achieve good compatibility, small mechanical properties, The effect of increasing strength

Inactive Publication Date: 2018-11-16
SHANDONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 a

Method used

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

Examples

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Effect test

Embodiment 1

[0035] A method for preparing sustainable self-repairing microcapsules for plugging air leakage material cracks in coal mines. In this embodiment, the bacterial freeze-dried powder in the microcapsule core material is selected from Bacillus sarcina pasteurianus, and the substrate is selected from urea, chlorinated Calcium, yeast powder, hydroxypropyl methylcellulose and microcrystalline cellulose, and the microcapsule wall materials are calcium carbide slag, desulfurized gypsum and water glass.

[0036] 1. Accurately weigh 30g of yeast powder, 8g of hydroxypropyl methylcellulose, and 150g of microcrystalline cellulose, mix well, add 3.5g of Bacillus sarcina pasteurii into 240g of water to make it evenly dispersed, Afterwards, each 75g of calcium chloride and urea that have been weighed are dissolved in the water that is dispersed with Bacillus sarcina, and then the liquid solution is added to the uniformly mixed yeast powder, hydroxypropyl methylcellulose and microcrystalline ...

Embodiment 2

[0041] A method for preparing sustainable self-repairing microcapsules for coal mine plugging wind material cracks. In this embodiment, the bacterial freeze-dried powder in the microcapsule core material is selected from Bacillus cereus, and the substrate is selected from urea, calcium lactate, and peptone. , yeast powder, xanthan gum and microcrystalline cellulose, and the microcapsule wall materials are made of fly ash, carbide slag, desulfurized gypsum and water glass.

[0042] 1. Accurately weigh 5g of peptone, 25g of yeast powder, 5g of xanthan gum, and 150g of microcrystalline cellulose, mix well, add 3g of Bacillus cereus into 225g of water to make it evenly dispersed, and then weigh it Dissolve 75g of good calcium lactate and urea in water dispersed with Bacillus cereus, then add the liquid solution to evenly mixed peptone, yeast powder, xanthan gum and microcrystalline cellulose, stir evenly to form group, and knead the agglomerated microcapsule core material until it...

Embodiment 3

[0046] A method for preparing sustainable self-repairing microcapsules for plugging air leakage material cracks in coal mines. In this embodiment, the bacterial freeze-dried powder in the microcapsule core material is selected from Bacillus sphaericus, and the substrate is selected from urea, calcium formate, peptone, Yeast powder, xanthan gum and microcrystalline cellulose, and microcapsule wall materials are selected from fly ash, carbide slag and water glass.

[0047] 1. Accurately weigh 5.5g of peptone, 28g of yeast powder, 5.5g of xanthan gum, and 150g of microcrystalline cellulose, mix well, add 3.3g of Bacillus sphaericus into 240g of water to make it evenly dispersed, and then Dissolve 75g of calcium formate and urea that have been weighed in water dispersed with Bacillus sphaericus, then add the liquid solution to evenly mixed peptone, yeast powder, xanthan gum and microcrystalline cellulose, stir evenly to make it Agglomerate, and knead the agglomerated microcapsule ...

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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,...

Claims

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Application Information

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IPC IPC(8): C12N11/14C04B24/38
CPCC04B40/0039C04B2103/0001C12N11/14C04B24/126C04B24/383C04B22/00C04B22/145C04B22/0006C04B20/1055C04B20/1077C04B20/1085C04B28/02C04B2111/00724C12N1/20C04B18/021
Inventor 胡相明吴明跃程卫民赵艳云薛迪
Owner SHANDONG UNIV OF SCI & TECH
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