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Expanded delay mining hole sealing material
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A sealing material and delay type technology, applied in the field of mining sealing materials, can solve the problems of expansion loss, gas escape, etc., and achieve the effect of improving workability, low price and improving toughness
Active Publication Date: 2015-08-05
ANHUI UNIV OF SCI & TECH
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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 solidphase space, which improves the expansion rate and solves the problems of gas escape and expansion loss.
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Embodiment 1
[0020] 30% of water, 60% of cement, 0.18% of polycarboxylic acid, 0.24% of microcapsules, 6% of water-based epoxy resin, and 3% of curing agent are used by mixing the above materials according to the mass ratio.
[0021] Using the sealing material of the present invention, aluminum powder expansion agent, cement material and polyurethane material, experiments were carried out for expansion time, expansion rate and strength. See Table 1:
[0024] (1) Compared with the other two materials, this material reacts immediately when the aluminum powder is directly mixed in a strong alkali environment, the reac...
Embodiment 2
[0027] Water: 30%, cement 65%, polycarboxylic acid: 0.2%, microcapsules: 0.3%, water-based epoxy resin: 5%, curing agent: 2.5%; the above substances can be used after mixing 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. Embodiment 2: water: 30%, cement 55%, polycarboxylate: 0.3%, microcapsule: 0.3%, waterborne epoxy resin: 8%, curing agent: 4%; Above-mentioned substances can be mixed 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%, microcapsules: 0.4%, water-based epoxy resin: 6%, curing agent: 3%; the above substances can be used after mixing according to the 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 expanded delay mining hole sealing material which is prepared after modification of an expanding agent by microcapsules. The hole sealing material is prepared by aluminum powder microcapsules, water, cement, polycarboxylate superplasticizer, water-borne epoxy resins E-51 and T31 curing agents according to certain mass percentage. The aluminum powder microcapsules are prepared by water, gelatin, sodium alginate and aluminum powder in a mass ratio of 100: 2: 2: (4-6) (wt). According to the expanded delay mining hole sealing material, ineffective expansion of earlier stage of the cement is delayed so that the cement can reach certain strength and then is expanded, and coordinating growth of material strength and expansion can be guaranteed. Final expansion rate reaches 15%-25%, one-day compressive strength is 3.2Mpa, three-day strength is 20.8Mpa, seven-day strength is 45.8Mpa, and requirements of mine gas extraction drilling sealing and strength can be met. The hole sealing material and the microcapsules can be prepared and used on site in the environment of high temperature and high humidity of a mine, toxicity is absent, and the price is low.
Description
technical field [0001] The invention relates to a mine-used sealing material, in particular to an expansion-delayed sealing material suitable for drilling and sealing holes in coal mine gas drainage. Background technique [0002] Coal is the main energy source in our country. However, the mining process is also accompanied by many disasters and accidents. Gas outburst has become a prominent problem in coalmine safety production. Borehole drainage has always been the basic means of coal mine gas control. After the drilling is completed, the drilling is generally sealed, and the sealing of the drilling is a key part, and the quality of the sealing has a strong impact on the gas drainage effect. Chinese patent CN101215463 discloses a drilling sealing material, which is made of water 30-40%, ordinary silicon cement 30-40%, sodiumbicarbonate 1.4-2%, sodiumcarbonate 1.5-2%, citric acid 3.0% -3.5%, calciumcarbonate 8.0-8.5%, bentonite 8.0-8.5%, gypsum 8.0-8.5%, polyacrylamide ...
Claims
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Application Information
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