High-performance inorganic anti-seepage leak-repairing material, preparation method and application

Abstract

The invention provides a high-performance inorganic anti-seepage leak-repairing material, a preparation method and application, and relates to the technical field of anti-seepage leak-repairing materials.The high-performance inorganic anti-seepage leak-repairing material is prepared by selecting 1.2-1.5 low-modulus sodium silicate and halloysite nanotube-graphene oxide dispersion system to activate pretreated slag, then using 1.8-2.0 low-modulus sodium silicate and calcium sulphoaluminate-magnesium oxide expansion system to activate again, and using a high-performance inorganic anti-seepage leak-repairing material to prepare the anti-seepage leak-repairing material. And curing to obtain the high-performance inorganic anti-seepage leak-repairing material. The initial setting time of the material is less than 15 min, the 28d strength is 80-85.3 MPa, the breaking strength is 12.0-13.2 MPa, and the drying shrinkage rate is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of anti-seepage and leak repair materials, and particularly relates to a high-performance inorganic anti-seepage and leak repair material, a preparation method and an application thereof. Background Art

[0002] In underground mining projects such as geology, mines, and oil and gas fields, strata such as fractured rock formations, soft interlayers, and water-rich layers are prone to groundwater seepage, which affects the mining process. Slag-based materials have been widely used in anti-seepage and leak repair projects in underground mining due to their low cost, wide sources, and certain cementitious properties.

[0003] However, traditional slag-based materials still have many problems in practical applications. Among them, the problem that rapid setting, high strength, and crack resistance cannot be achieved simultaneously is particularly prominent. Traditional slag-based materials commonly use a single alkali activator system, relying on a highly alkaline environment to rapidly dissolve the active components of slag to achieve early setting. However, this method has obvious drawbacks: although the high alkalinity can shorten the initial setting time to 20 - 30 minutes, excessive sodium ions will hinder the polymerization of silicate ions, resulting in insufficient formation of C-S-H gel in the later stage, and the 28-day compressive strength is only 50 - 60 MPa. Moreover, during the hydration process, intense heat release and sharp changes in ion concentration will cause disordered accumulation of products, generating connected pores (pore diameter > 100 nm), and concentrated shrinkage stress, resulting in high brittleness of the material (flexural strength < 8 MPa) and a drying shrinkage rate as high as 0.08%, which cannot meet the requirements of high impermeability (< 2.0 MPa) and crack resistance simultaneously.

[0004] In recent years, some researchers have tried to improve the performance by incorporating nanomaterials (such as nano-SiO2, carbon nanotubes) or composite expansion sources. However, there are still essential defects: externally added nanoparticles are prone to agglomeration due to high surface energy, which exacerbates the loss of slurry fluidity (fluidity < 200 mm), has poor interfacial bonding with the matrix, and cannot guide the directional growth of products; single expansion sources such as sulfoaluminate can only compensate for shrinkage at specific stages (such as the early stage), and the expansion of microcracks in the later stage (width > 0.2 mm) will still reduce the impermeability. Most importantly, the existing technology cannot regulate the hydration reaction kinetics in a time-sequential manner, cannot solve the contradiction between "rapid setting requires high alkalinity" and "high strength requires continuous silicon supply", and has not established a real-time sensing mechanism for structural defects, and the service state of the material is opaque.

[0005] Therefore, there is an urgent need to develop a high-performance anti-seepage and leak repair material that can effectively balance rapid setting, high strength, and crack resistance to meet the higher requirements for anti-seepage and leak repair technology in geological mining and underground engineering. Summary of the Invention

[0006] In view of the technical problems existing in the prior art, the present invention aims to provide a high-performance inorganic anti-seepage and leak repair material, a preparation method and an application thereof.

[0007] One of the purposes of the present invention is to provide a preparation method of a high-performance inorganic anti-seepage and leak repair material, including: Activating slag to obtain pretreated slag; Mixing sodium silicate solution with a modulus of 1.2 - 1.5, halloysite nanotube-graphene oxide dispersion system and pretreated slag evenly to obtain a first slurry; Injecting sodium silicate solution with a modulus of 1.8 - 2.0 and calcium sulfoaluminate-magnesium oxide expansion system into the first slurry and mixing evenly to obtain a second slurry; Curing the second slurry to obtain a high-performance inorganic anti-seepage and leak repair material. Preferably, the halloysite nanotube-graphene oxide dispersion system includes halloysite nanotubes and graphene oxide, and the mass ratio of halloysite nanotubes to graphene oxide is 3:1 - 8:1.

[0008] Preferably, the diameter of the halloysite nanotubes is 50 - 70 nm, and the aspect ratio is 10:1.

[0009] Preferably, the thickness of the graphene oxide is 1 - 3 nm, the sheet diameter is 5 - 10 μm, and the oxygen content is 40%.

[0010] Preferably, the calcium sulfoaluminate-magnesium oxide expansion system includes calcium sulfoaluminate and magnesium oxide, and the mass ratio of calcium sulfoaluminate to magnesium oxide is 2:1 - 4:1.

[0011] Preferably, the particle size of the calcium sulfoaluminate is less than 10 μm, and the particle size of the magnesium oxide is less than 5 μm.

[0012] Preferably, activating slag to obtain pretreated slag includes: Grinding the slag to a specific surface area of 600 - 800 m² / kg to obtain ground slag; Mixing the ground slag and sodium sulfate to obtain pretreated slag.

[0013] Preferably, the mass ratio of sodium sulfate to slag is 1:100 - 3:100.

[0014] Another purpose of the present invention is to provide a high-performance inorganic anti-seepage and leak repair material prepared by the above-mentioned preparation method.

[0015] Another purpose of the present invention is to provide an application of the above-mentioned high-performance inorganic anti-seepage and leak repair material in the anti-seepage and leak repair project of underground mining.

[0016] The beneficial effects of the present invention: The present invention first selects sodium silicate with a low modulus of 1.2 - 1.5 and halloysite nanotube-graphene oxide dispersion system to activate and pretreat slag, and then uses sodium silicate with a modulus of 1.8 - 2.0 and calcium sulfoaluminate-magnesium oxide expansion system to activate again. After curing, a high-performance inorganic anti-seepage and leak repair material is obtained. The initial setting time of this material is less than 15 minutes, the 28-day strength is 80 - 85.3 MPa, the flexural strength is 12.0 - 13.2 MPa, and the drying shrinkage rate is reduced. Detailed implementation mode

[0017] According to the first aspect of the present invention, a preparation method of a high-performance inorganic anti-seepage and leak repair material is provided, including: Activating slag to obtain pretreated slag; Mixing a sodium silicate solution with a modulus of 1.2 - 1.5, a halloysite nanotube-graphene oxide dispersion system and the pretreated slag evenly to obtain a first slurry; Injecting a sodium silicate solution with a modulus of 1.8 - 2.0 and a calcium sulfoaluminate-magnesium oxide expansion system into the first slurry and mixing evenly to obtain a second slurry; Curing the second slurry to obtain a high-performance inorganic anti-seepage and leak repair material. In the present invention, in the sodium silicate solution (Na2O·1.2SiO2) with a modulus of 1.2 - 1.5, the concentration of Na + is high, the concentration of SiO3 2- is low, and the high-alkaline environment with pH≈13.5 rapidly dissolves Ca 2+ , Al 3+ , Si 4+ and other plasma in the slag, triggering the initial reaction: Ca 2+ +Al(OH)4 − +OH − →C-A-H (CaO-Al2O3-H2O, early gel), forming an initial skeleton structure, with the initial setting time less than 15 minutes, and at the same time the slurry still maintains high fluidity (260 mm). After the initial setting, sodium silicate with a modulus of 1.8 - 2.0 (Na2O·2.0SiO2) is injected. Its high SiO3 2- concentration combines with the Ca 2+ released in the early stage, continuously generating a high-polymerization-degree C-S-H gel: Ca 2+ +SiO3 2-→C-S-H, (CaO-SiO2-H2O), which has longer silicon-oxygen chains and higher crosslinking degree. The proportion of C-S-H gel increases and the gel density increases; halloysite nanotubes (HNTs) are rich in hydroxyl groups on the surface and serve as heterogeneous nucleation sites, reducing the nucleation barrier of C-S-H and accelerating the precipitation of the gel phase. HNTs are arranged staggered, converting capillary pores (100 nm) into gel pores (<10 nm), and the porosity decreases; the oxygen-containing functional groups (-OH, -COOH) on the surface of graphene oxide (GO) form coordination bonds with Ca on the surface of slag particles 2+ to optimize the structure of the interfacial transition zone (ITZ), reduce the porosity of the ITZ, and increase the compressive strength of the material to 80 - 85 MPa.

[0018] In the present invention, the tubular structure of HNTs guides the axial growth of C-S-H to form a "tube bundle reinforcement", solving the problem of easy brittle fracture of traditional materials due to disordered structure. HNTs form a three-dimensional skeleton in the gel phase and prevent crack propagation through the bridging effect; GO sheets form a nanoscale network structure in the hydration products and bridge microcracks through hydrogen bonding and mechanical interlocking; the early C-A-H framework and the later C-S-H gel form a "soft-hard alternating" structure to avoid stress concentration and improve the crack resistance. When the width of microcracks ≤ 0.1 μm, the hydroxyl groups on the surface of HNTs combine with the unreacted Ca 2+ / SiO3 2- to trigger the local regeneration of C-S-H, close the cracks and reduce the crack width, and improve the flexural strength.

[0019] In the present invention, calcium sulfoaluminate (CSA) reacts with water within 1 - 7 days to generate ettringite (AFt), with a volume expansion of 0.1 - 0.2%, offsetting the plastic shrinkage. MgO hydrates to generate Mg(OH)2 within 7 - 28 days, with a volume expansion of 0.05 - 0.1%, compensating for the drying and reducing the shrinkage rate. The two-dimensional structure of GO restricts the directional growth of hydration products, reducing the drying shrinkage rate, and forms a synergistic compensation with the calcium sulfoaluminate-magnesium oxide expansion source.

[0020] In a preferred embodiment of the present invention, the halloysite nanotube-graphene oxide dispersion system includes halloysite nanotubes and graphene oxide, and the mass ratio of halloysite nanotubes to graphene oxide is 3:1 - 8:1.

[0021] A mass ratio of halloysite nanotubes (HNTs) to graphene oxide (GO) of 3:1 can ensure that GO forms a permeable network and the nucleation density of HNTs is sufficient. A mass ratio of HNTs to GO of 8:1 can avoid problems such as a sharp increase in the solution viscosity and a decrease in fluidity caused by excessive HNTs. Different ratios are beneficial for ultrasonic energy matching and Zeta potential regulation. For example, when the ratio is 5:1, the surface charges of the two are complementary and the suspension has good stability. Within this ratio range, the compressive strength, resistance humidity sensitivity, and fluidity can be synergistically optimized, while outside this range, the performance drops sharply. When the ratio is lower than 3:1, insufficient GO content may not be able to form an effective permeable network, and too few HNTs lead to insufficient nucleation density, affecting the orientation of hydration products. When the ratio is higher than 8:1, excessive HNTs will cause a too high specific surface area, a sharp increase in solution viscosity, and a decrease in fluidity.

[0022] In a preferred embodiment of the present invention, the diameter of the halloysite nanotubes is 50 - 70 nm, and the aspect ratio is 10:1.

[0023] In the present invention, a diameter of 50 - 70 nm for the halloysite nanotubes can ensure a high specific surface area of the nanotubes to expose abundant hydroxyl (-OH) nucleation sites, while avoiding the agglomeration problem caused by too small a diameter (<50 nm) to ensure uniform dispersion. The relatively long tube body (700 - 1000 nm) can penetrate multiple gel phase units, disperse stress through the bridging effect, and the moderate aspect ratio of 10:1 takes into account the processing fluidity, avoids a sharp increase in the slurry viscosity, and enhances the directional guiding ability. The size matches the gap between slag particles and the growth scale of C-S-H gel, forming an "nanotube - gel" interpenetrating network, which improves the flexural strength and reduces the critical crack width.

[0024] In a preferred embodiment of the present invention, the thickness of the graphene oxide is 1 - 3 nm, the sheet diameter is 5 - 10 μm, and the oxygen content is 40%.

[0025] In a preferred embodiment of the present invention, the calcium sulfoaluminate - magnesium oxide expansion system includes calcium sulfoaluminate and magnesium oxide, and the mass ratio of calcium sulfoaluminate to magnesium oxide is 2:1 - 4:1.

[0026] In the present invention, when the mass ratio of calcium sulfoaluminate to magnesium oxide is 2:1 to 4:1, CSA can initiate early expansion within 3 - 12 hours, provide an expansion rate of 0.08% - 0.15% within 3 - 7 days to inhibit plastic shrinkage, and MgO initiates late expansion at 14 - 28 days, generating an expansion rate of 0.03% - 0.08% (at 60d) within 28 - 90 days to compensate for late shrinkage, avoiding stress concentration caused by too high MgO content in the later stage or excessive early expansion due to too high CSA ratio, which makes the structure loose and affects the formation of C-S-H gel in the later stage. This range is adapted to the process and can achieve uniform dispersion through conventional dry mixing. When the ratio is lower than 2:1, the low MgO content may not fully exert the late expansion compensation effect, and additional CSA may be required to compensate for early shrinkage, resulting in a poor cost-benefit ratio; when the ratio is higher than 4:1, the too high CSA ratio leads to an increase in the early expansion rate, the structure becomes loose, the porosity increases, and at the same time, too much Ca 2+ affects the formation of C-S-H gel in the later stage, the 28d strength decreases, the mixing time needs to be extended to increase energy consumption, and the impermeability pressure and volume stability will deteriorate non-linearly.

[0027] In a preferred embodiment of the present invention, the particle size of calcium sulfoaluminate is less than 10 μm, and the particle size of the magnesium oxide is less than 5 μm.

[0028] In the present invention, a particle size of calcium sulfoaluminate (CSA) ≤ 10 μm ensures its rapid hydration to form ettringite (expansion rate of 0.1 - 0.2% within 1 - 7 days), timely compensating for plastic shrinkage; a particle size of magnesium oxide (MgO) ≤ 5 μm regulates the hydration rate by increasing the specific surface area (expansion rate of 0.05 - 0.1% within 7 - 28 days), achieving a progressive combination of late expansion and the matrix, and avoiding crack initiation caused by stress mutation. The particle size difference matches the requirements of staged shrinkage compensation, synergistically improving volume stability.

[0029] In a preferred embodiment of the present invention, activating slag to obtain pretreated slag includes: Grinding the slag to a specific surface area of 600 - 800 m² / kg to obtain ground slag; Mixing the ground slag and sodium sulfate to obtain pretreated slag.

[0030] In the present invention, the specific surface area of the slag is 600 - 800 m² / kg, exposing more active sites and greatly increasing the surface reaction activity of the particles. Adding sodium sulfate pretreatment, sodium sulfate reacts with the aluminum phase in the slag to form ettringite (AFt), releasing Ca 2+ and SO4 2 , destroying the vitreous structure of the slag, promoting the dissolution of Al 3+ and Si 4+ , and accelerating early hydration.

[0031] In a preferred embodiment of the present invention, the mass ratio of sodium sulfate to slag is 1:100 to 3:100.

[0032] In the present invention, the preparation method of the high-performance inorganic anti-seepage and leakage repair material specifically includes: Grind the slag to a specific surface area of 600 - 800 m² / kg to obtain ground slag; Mix the ground slag and sodium sulfate to obtain pretreated slag; Prepare a sodium silicate solution with a modulus of 1.2 - 1.5 and a sodium silicate solution with a modulus of 1.8 - 2.0 for standby; Add halloysite nanotubes and graphene oxide to deionized water with a water-to-solid ratio of 0.3, and perform ultrasonic treatment for 30 minutes to form a uniform suspension, obtaining a halloysite nanotube - graphene oxide dispersion system; Dry-mix calcium sulfoaluminate and magnesium oxide to ensure uniform compounding, obtaining a calcium sulfoaluminate - magnesium oxide expansion system; Mix the sodium silicate solution with a modulus of 1.2 - 1.5, the halloysite nanotube - graphene oxide dispersion system, and the pretreated slag evenly to obtain a first slurry; Inject the sodium silicate solution with a modulus of 1.8 - 2.0 into the first slurry with a high-pressure grouting pump, and at the same time add the calcium sulfoaluminate - magnesium oxide expansion system, and mix evenly to obtain a second slurry; Cure the second slurry to obtain a high-performance inorganic anti-seepage and leakage repair material.

[0033] According to the second aspect of the present invention, there is provided a high-performance inorganic anti-seepage and leakage repair material prepared by the preparation method as described above.

[0034] According to the third aspect of the present invention, there is provided an application of the described high-performance inorganic anti-seepage and leakage repair material in the anti-seepage and leakage repair project of underground mining.

[0035] Example 1 Grind the slag to a specific surface area of 680 m² / kg to obtain ground slag; Mix 100 parts of the ground slag and 2 parts of sodium sulfate to obtain pretreated slag; Prepare a sodium silicate solution with a modulus of 1.2 and a sodium silicate solution with a modulus of 1.8 for standby; Add 1.5 parts of halloysite nanotubes and 0.3 parts of graphene oxide to deionized water with a water-to-solid ratio of 0.3, and perform ultrasonic treatment for 30 minutes to form a uniform suspension, obtaining a halloysite nanotube - graphene oxide dispersion system; Dry-mix 3 parts of calcium sulfoaluminate and 1 part of magnesium oxide to ensure uniform compounding, obtaining a calcium sulfoaluminate - magnesium oxide expansion system; Mix 8 parts of sodium silicate solution with a modulus of 1.2, halloysite nanotube-graphene oxide dispersion system and pretreated slag evenly to obtain the first slurry; Inject 5 parts of sodium silicate solution with a modulus of 1.8 into the first slurry with a high-pressure grouting pump, and at the same time add a calcium sulfoaluminate-magnesium oxide expansion system, and mix evenly to obtain the second slurry; Carry out standard wet curing on the second slurry for 28 days to obtain the high-performance inorganic anti-seepage and leak repair material of Example 1.

[0036] Example 2 Except for the following steps, the rest of the operation steps and parameters are the same as those in Example 1.

[0037] Add 2 parts of halloysite nanotubes and 0.5 part of graphene oxide to deionized water, with a water-solid ratio of 0.3, and ultrasonically treat for 30 minutes to form a uniform suspension to obtain a halloysite nanotube-graphene oxide dispersion system; Dry-mix 4 parts of calcium sulfoaluminate and 1 part of magnesium oxide to ensure uniform compounding to obtain a calcium sulfoaluminate-magnesium oxide expansion system; Mix 10 parts of sodium silicate solution with a modulus of 1.5, halloysite nanotube-graphene oxide dispersion system and pretreated slag evenly to obtain the first slurry; Inject 6 parts of sodium silicate solution with a modulus of 2.0 into the first slurry with a high-pressure grouting pump, and at the same time add a calcium sulfoaluminate-magnesium oxide expansion system, and mix evenly to obtain the second slurry; Carry out standard wet curing on the second slurry for 28 days to obtain the high-performance inorganic anti-seepage and leak repair material of Example 2.

[0038] Example 3 Except for the following steps, the rest of the operation steps and parameters are the same as those in Example 1.

[0039] Add 1 part of halloysite nanotubes and 0.2 part of graphene oxide to deionized water, with a water-solid ratio of 0.3, and ultrasonically treat for 30 minutes to form a uniform suspension to obtain a halloysite nanotube-graphene oxide dispersion system; Dry-mix 3.5 parts of calcium sulfoaluminate and 1 part of magnesium oxide to ensure uniform compounding to obtain a calcium sulfoaluminate-magnesium oxide expansion system; Mix 9 parts of sodium silicate solution with a modulus of 1.3, halloysite nanotube-graphene oxide dispersion system and pretreated slag evenly to obtain the first slurry; Inject 5.5 parts of sodium silicate solution with a modulus of 1.9 into the first slurry with a high-pressure grouting pump, and at the same time add a calcium sulfoaluminate-magnesium oxide expansion system, and mix evenly to obtain the second slurry; Carry out standard wet curing on the second slurry for 28 days to obtain the high-performance inorganic anti-seepage and leak repair material of Example 3.

[0040] Example 4 Except for the following steps, the remaining operation steps and parameters are the same as those in Example 1.

[0041] Grind the slag to a specific surface area of 720 m² / kg to obtain ground slag. Mix 100 parts of ground slag and 2.5 parts of sodium sulfate to obtain pretreated slag. Add 2.5 parts of halloysite nanotubes and 0.4 parts of graphene oxide to deionized water with a water-to-solid ratio of 0.3, and ultrasonically treat for 30 minutes to form a uniform suspension, obtaining a halloysite nanotube-graphene oxide dispersion system. Dry-mix 3.2 parts of calcium sulfoaluminate and 1 part of magnesium oxide to ensure uniform compounding, obtaining a calcium sulfoaluminate-magnesium oxide expansion system. Mix 9.5 parts of sodium silicate solution with a modulus of 1.4, the halloysite nanotube-graphene oxide dispersion system, and the pretreated slag evenly to obtain a first slurry. Inject 5 parts of sodium silicate solution with a modulus of 1.9 into the first slurry with a high-pressure grouting pump, and at the same time add the calcium sulfoaluminate-magnesium oxide expansion system, and mix evenly to obtain a second slurry. Standard wet-cure the second slurry for 28 days to obtain the high-performance inorganic anti-seepage and leak-repairing material of Example 4.

[0042] Example 5 Except for the following steps, the remaining operation steps and parameters are the same as those in Example 1.

[0043] Add 1.8 parts of halloysite nanotubes and 0.35 parts of graphene oxide to deionized water with a water-to-solid ratio of 0.3, and ultrasonically treat for 30 minutes to form a uniform suspension, obtaining a halloysite nanotube-graphene oxide dispersion system. Dry-mix 3.8 parts of calcium sulfoaluminate and 1 part of magnesium oxide to ensure uniform compounding, obtaining a calcium sulfoaluminate-magnesium oxide expansion system. Mix 7 parts of sodium silicate solution with a modulus of 1.2, the halloysite nanotube-graphene oxide dispersion system, and the pretreated slag evenly to obtain a first slurry. Inject 6 parts of sodium silicate solution with a modulus of 2.0 into the first slurry with a high-pressure grouting pump, and at the same time add the calcium sulfoaluminate-magnesium oxide expansion system, and mix evenly to obtain a second slurry. Standard wet-cure the second slurry for 28 days to obtain the high-performance inorganic anti-seepage and leak-repairing material of Example 5.

[0044] Example 6 Except for the following steps, the remaining operation steps and parameters are the same as those in Example 1.

[0045] Add 1.2 parts of halloysite nanotubes and 0.25 parts of graphene oxide to deionized water with a water-to-solid ratio of 0.3, and ultrasonically treat for 30 minutes to form a uniform suspension, obtaining a halloysite nanotube-graphene oxide dispersion system. Dry mix 3 parts of calcium sulfoaluminate and 1 part of magnesium oxide to ensure uniform compounding, obtaining a calcium sulfoaluminate-magnesium oxide expansion system; Mix 11 parts of sodium silicate solution with a modulus of 1.5, halloysite nanotube-graphene oxide dispersion system and pretreated slag evenly to obtain a first slurry; In the first slurry, inject 4.5 parts of sodium silicate solution with a modulus of 1.8 using a high-pressure grouting pump, and at the same time add the calcium sulfoaluminate-magnesium oxide expansion system, and mix evenly to obtain a second slurry; Standard wet cure the second slurry for 28 days to obtain the high-performance inorganic anti-seepage and leak repair material of Example 6.

[0046] Comparative Example 1 Mix the sodium silicate solution with a modulus of 1.5, halloysite nanotube-graphene oxide dispersion system and pretreated slag evenly to obtain a first slurry, and then add the calcium sulfoaluminate-magnesium oxide expansion system and mix evenly to obtain a second slurry; Standard wet cure the second slurry for 28 days to obtain the high-performance inorganic anti-seepage and leak repair material of Comparative Example 1.

[0047] The remaining steps and parameters are the same as those in Example 1.

[0048] Comparative Example 2 Do not add the halloysite nanotube-graphene oxide dispersion system, and the remaining steps and parameters are the same as those in Example 1.

[0049] Comparative Example 3 Use 4 parts of single calcium sulfoaluminate to replace the calcium sulfoaluminate-magnesium oxide expansion system, and the rest is the same as in Example 1.

[0050] Performance test The initial setting time is tested according to the standard of 《GB / T 1346-2011》; The compressive strength and flexural strength are tested according to the standard of 《GB / T 17671-1999》; The anti-seepage pressure is tested according to the standard of 《GB / T 23440-2009 》; The shrinkage rate is tested according to the standard of 《GB / T 50082-2009 》.

[0051] The test results are shown in Table 1: Table 1 Performance test results

[0052] The comprehensive performance of the material prepared by the embodiment through gradient activator timing regulation, nano-material directional enhancement and double expansion source synergistic compensation is significantly better than that of the comparative example, the initial setting time is significantly shortened, the strength and anti-seepage pressure are significantly improved; the shrinkage rate is significantly reduced. It effectively takes into account the rapid setting, high strength and crack resistance performance.

Claims

1. A preparation method of a high-performance inorganic anti-seepage and leak repair material, characterized in that, The method includes: Activating slag to obtain pretreated slag; Mixing a sodium silicate solution with a modulus of 1.2 - 1.5, a halloysite nanotube - graphene oxide dispersion system, and the pretreated slag evenly to obtain a first slurry; Injecting a sodium silicate solution with a modulus of 1.8 - 2.0 and a calcium sulfoaluminate - magnesium oxide expansion system into the first slurry and mixing evenly to obtain a second slurry; Curing the second slurry to obtain a high - performance inorganic anti - seepage and leak - plugging material.

2. The preparation method according to claim 1, wherein The halloysite nanotube - graphene oxide dispersion system includes halloysite nanotubes and graphene oxide, and the mass ratio of halloysite nanotubes to graphene oxide is 3:1 - 8:

1.

3. The preparation method according to claim 2, characterized in that, The diameter of the halloysite nanotubes is 50 - 70 nm, and the aspect ratio is 10:

1.

4. The preparation method according to claim 2, characterized in that, The thickness of the graphene oxide is 1 - 3 nm, the sheet diameter is 5 - 10 μm, and the oxygen content is 40%.

5. The preparation method according to claim 1, characterized in that, The calcium sulfoaluminate - magnesium oxide expansion system includes calcium sulfoaluminate and magnesium oxide, and the mass ratio of calcium sulfoaluminate to magnesium oxide is 2:1 - 4:

1.

6. The preparation method according to claim 5, characterized in that, The particle size of the calcium sulfoaluminate is less than 10 μm, and the particle size of the magnesium oxide is less than 5 μm.

7. The preparation method according to claim 1, characterized in that, Activating the slag to obtain pretreated slag includes: Grinding the slag to a specific surface area of 600 - 800 m² / kg to obtain ground slag; Mixing the ground slag and sodium sulfate to obtain pretreated slag.

8. The preparation method according to claim 7, characterized in that, The mass ratio of sodium sulfate to slag is 1:100 - 3:

100.

9. A high - performance inorganic anti - seepage and leak - plugging material prepared by the preparation method according to any one of claims 1 - 8.

10. An application of the high - performance inorganic anti - seepage and leak - plugging material according to claim 9 in the anti - seepage and leak - plugging project of underground mining.

Images