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A kind of expansion delay type mine sealing material

A sealing material and delay type technology, which is applied in the field of mining sealing materials, can solve the problems of gas escape, expansion loss, etc., and achieve the effect of low price, improved workability, and good filling of micro-cracks

Active Publication Date: 2017-12-01
ANHUI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The expansion agent is encapsulated by the microencapsulation method, and the aluminum powder does not participate in the reaction at the initial stage of cement hydration under the protection of the capsule wall, so as to overcome the shortcomings of the aluminum powder being directly mixed with the reaction too fast, a large amount of gas escapes, and a through hole is produced; while the encapsulation The final aluminum powder is slowly released to participate in the reaction. At this time, the cement has a certain strength, and the gas generated by the reaction is enclosed in the solid phase space, which improves the expansion rate and solves the problems of gas escape and expansion loss.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Water 30%, cement 60%, polycarboxylic acid 0.18%, microcapsule 0.24%, water-based epoxy resin 6%, curing agent 3%, the above-mentioned materials are mixed and used in a mass ratio.

[0021] Using the sealing material, aluminum powder expansion agent, cement material and polyurethane material of the present invention, the expansion time, expansion rate and strength are tested. See Table 1:

[0022]

Expansion time

Expansion times

7-day compressive strength

Material of the invention

After 4h delay, expand for 8h

15％

43.8Mpa

Aluminum powder expansion agent cement

Expansion 5h

25％

22.5Mpa

Polyurethane material

Expansion 0.025h

1000％

2.8Mpa

[0023] Analysis table one shows:

[0024] (1) Compared with the other two materials, this material is directly mixed with aluminum powder and reacts immediately in a strong alkali environment. The reaction time is short, and the gas generated is easy to escape, the expansion ratio is larger, and the larger pores are easily gener...

Embodiment 2

[0027] Water: 30%, cement 65%, polycarboxylic acid: 0.2%, microcapsule: 0.3%, water-based epoxy resin: 5%, curing agent: 2.5%; it can be used after mixing the above substances according to the mass percentage, and the expansion is delayed The time is 4.50 hours, the expansion ratio is 20%, and the 7-day compressive strength is 38.5MPa. Example 2: Water: 30%, cement 55%, polycarboxylic acid: 0.3%, microcapsule: 0.3%, water-based epoxy resin: 8%, curing agent: 4%; just mix the above substances according to mass percentage In use, the expansion delay time is 5.0 hours, the expansion ratio is 18%, and the 7-day compressive strength is 45.6MPa.

Embodiment 3

[0029] Water: 35%, cement: 60%, polycarboxylic acid: 0.1%, microcapsule: 0.4%, water-based epoxy resin: 6%, curing agent: 3%; the above substances can be used after being mixed according to mass percentage. The delay time is 4.8 hours, the expansion ratio is 22%, and the 7-day compressive strength is 40.5MPa.

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Abstract

The invention relates to an expansion-delayed mining sealing material prepared after the expansion agent is modified by microcapsules. The sealing material is composed of aluminum powder microcapsules, water, cement, polycarboxylate water reducer, water-based epoxy resin E ‑51, T31 curing agent, prepared according to a certain mass percentage. The aluminum powder microcapsules are prepared according to the mass ratio of water, gelatin, sodium alginate and aluminum powder being 100:2:2:4-6 (wt). The hole-sealing material of the present invention delays the invalid expansion of cement in the early stage and expands after the cement reaches a certain strength, thereby ensuring the coordinated development of material strength and expansion. The final expansion rate reaches 15-25%, the 1-day compressive strength is 3.2Mpa, the 3-day strength is 20.8Mpa, and the 7-day strength is 45.8Mpa, which can meet the requirements of mine gas drainage drilling hole sealing and strength. In addition, the sealing material and the microcapsules can be prepared and used on site under the high-temperature and high-humidity environment of a mine, and are non-toxic and low in price.

Description

Technical field [0001] The invention relates to a sealing material for mines, in particular to an expansion delay type sealing material suitable for drilling and sealing of coal mine gas extraction. Background technique [0002] Coal is the main energy source in our country. However, during the mining process, many disasters and accidents have occurred. Gas outburst has become a prominent problem in coal mine safety production. Drilling and drainage has always been a basic method for coal mine gas management. After drilling the hole, it is generally necessary to seal the hole, and the hole sealing is the key part, and the quality of the hole sealing seriously affects the effect of gas drainage. Chinese patent CN101215463 discloses a drilling sealing material, which is composed of 30-40% water, 30-40% ordinary silicon cement, 1.4-2% sodium bicarbonate, 1.5-2% sodium carbonate, and 3.0% citric acid. -3.5%, calcium carbonate 8.0-8.5%, bentonite 8.0-8.5%, gypsum 8.0-8.5%, polyacryla...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04
Inventor 刘健刘泽功王小婷吴海龙娄亚北郭林杰
Owner ANHUI UNIV OF SCI & TECH