A high-toughness corrosion-resistant mine wall spraying material, a preparation method thereof and application thereof

Abstract

The application discloses a kind of high toughness corrosion-resistant mine wall spraying material, its preparation method and application, belong to mine wall spraying material technical field.The spraying material, by mass fraction from following raw materials:inorganic cementing material 20~40%, functional filler 5~10%, polymer glue powder 15~35%, accelerator 0.5~5%, flame retardant 4~10%, polyvinyl alcohol 0.1~5%, water 10~40%.The mine wall spraying material can reach the requirement on six key performance indicators of toughness, adhesion, rapid construction, corrosion resistance, efficient flame retardation and excellent antistatic, especially in toughness, remarkable excellent technical effect is obtained, and its high mechanical strength is also guaranteed, so as to show good application prospect and value in the field of mine wall spraying material technology.

Description

Technical Field

[0001] This invention belongs to the technical field of mining wall spraying materials, specifically relating to a high-toughness and corrosion-resistant mining wall spraying material, its preparation method and application. Background Technology

[0002] In the construction and maintenance of mines, tunnels, and underground engineering projects, rapidly constructing sealing structures, filling fissures in surrounding rock, and sealing leakage channels are key technologies for preventing gas accumulation, spontaneous combustion of combustibles, and structural corrosion. Traditional methods, such as building brick or stone sealing walls or spraying ordinary concrete, can achieve a certain degree of sealing, but after curing, they form rigid structures that are prone to cracking due to changes in geological stress, engineering disturbances, or temperature fluctuations, leading to seal failure. Furthermore, underground engineering environments commonly contain high humidity and are rich in harmful ions (such as Cl-). - SO4 2- Problems such as acidic media can easily cause chemical corrosion to cement-based materials, which not only reduces their durability, but may also exacerbate gas leakage and safety hazards due to the degradation of material properties.

[0003] In recent years, some polymer-based spraying materials have emerged in related fields, introducing flexible components to improve crack resistance. However, they still have significant limitations in practical engineering: on the one hand, most materials struggle to balance flexibility and mechanical strength, often sacrificing tensile and compressive strength to increase elongation, making them unsuitable for continuous deformation stress environments; on the other hand, the corrosion resistance of existing materials is generally insufficient, making it difficult to withstand the erosion of complex underground chemical environments over long periods. Furthermore, they also have certain defects in terms of workability, such as excessively long surface drying time affecting the continuity of operations, or excessively rapid curing leading to poor interlayer adhesion when spraying large areas.

[0004] Therefore, developing a spraying material for underground engineering that combines high flexibility, high mechanical strength, excellent corrosion resistance, suitable construction time window, and flame retardant and antistatic functions is of great engineering and technical significance for improving the long-term reliability of sealing structures and ensuring the safe and stable operation of various underground spaces. Summary of the Invention

[0005] This invention provides a high-toughness, corrosion-resistant spray coating material for mining walls, which is composed of the following raw materials by mass fraction: The composition consists of 20-40% inorganic cementitious materials, 5-10% functional fillers, 15-35% polymer powder, 0.5-5% quick-setting agent, 4-10% flame retardant, 0.1-5% polyvinyl alcohol, and 10-40% water.

[0006] In one specific implementation, the high-toughness and corrosion-resistant mining wall spraying material is composed of the following raw materials by mass fraction: The composition consists of 30% inorganic cementitious materials, 6% functional fillers, 30% polymer powder, 1% quick-setting agent, 7.2% flame retardant, 0.8% polyvinyl alcohol, and 25% water.

[0007] In the above technical solution, the inorganic cementitious material is at least one of aluminate cement, sulfoaluminate cement, and phosphate cement.

[0008] In the above technical solution, the functional filler is at least one of nano-silica, silicon carbide powder, nano-calcium carbonate, and diamond powder; preferably, it is nano-silica and silicon carbide powder, with a mass ratio of 1:1.

[0009] In the above technical solution, the polymer powder is at least one of acrylic powder, vinyl acetate-ethylene copolymer powder, epoxy resin powder, butadiene and styrene copolymer powder; preferably acrylic powder and vinyl acetate-ethylene copolymer powder, with a mass ratio of 1:1.

[0010] In the above technical solution, the quick-setting agent is at least one of sodium hydroxide, sodium carbonate, calcium formate, and sodium sulfate.

[0011] In the above technical solution, the flame retardant is at least one of melamine, barium metaborate, decabromodiphenyl ethane, and antimony trioxide.

[0012] This invention provides a method for preparing the above-mentioned high-toughness and corrosion-resistant mining wall spraying material, the steps of which are as follows: Inorganic cementitious materials, functional fillers, polymer powder, quick-setting agent, flame retardant, and polyvinyl alcohol are mixed and stirred evenly. Then water is added and stirred evenly to obtain the spraying material.

[0013] This invention provides the application of the above-mentioned high-toughness and corrosion-resistant mining wall spraying material in the rapid construction of sealing structures, filling of surrounding rock fissures, or sealing of leakage channels.

[0014] The beneficial effects of this invention are as follows: The wall spraying material prepared by this invention can meet the requirements of six key performance indicators: toughness, adhesion, rapid construction, corrosion resistance, high flame retardancy and excellent antistatic properties. In particular, it has achieved remarkable technical results in toughness, while also ensuring its high mechanical strength. Thus, it shows good application prospects and value in the field of mining wall spraying materials technology. Attached Figure Description

[0015] Figure 1 Photograph of the coating formed by the sprayed material.

[0016] Figure 2 Images show the actual application of spray coating materials. Detailed Implementation

[0017] The materials used in this invention are as follows: Aluminate cement, model CA50-A600, was purchased from Longquan High Alumina Melting Material Plant in Xinmi City, Henan Province; acrylic adhesive powder (8566) was purchased from Shanghai Qinhe Chemical Co., Ltd.; vinyl acetate-ethylene copolymer adhesive powder (model 7350M) was purchased from Shandong Yousuo Chemical Technology Co., Ltd.; polyvinyl alcohol (model 23-99(H), degree of polymerization 2426) was purchased from Anhui Wanwei High-Tech Materials Co., Ltd.

[0018] In this invention, the methods for testing various properties of the spraying material are as follows: 1. Tensile strength and elongation at break Apply the coating according to GB / T 16777—2008 "Test Methods for Waterproof Coatings for Buildings". After standard curing for 4 days, remove the coating and cut dumbbell-shaped specimens conforming to GB / T528. Mark parallel lines at 25mm intervals on each specimen. Measure the thickness at three points (midpoint and both ends) of the marked lines using a thickness gauge, and take the arithmetic mean as the specimen thickness. Input the measured thickness into the tensile testing machine's computer system. Adjust the clamp spacing of the tensile testing machine to approximately 70mm. Clamp the specimen on the testing machine and attach the extensometers at 25mm intervals, ensuring the centerline of the specimen's length is aligned with the center of the testing machine clamps. Stretch at a tensile speed of 200mm / min until fracture. Record the tensile strength and elongation at break data on the tensile testing machine's computer.

[0019] 2. Bond strength Before the test, the prepared mortar blocks, tools, and coatings should be left to stand for at least 24 hours under standard test conditions. Take five mortar blocks, remove the surface laitance with sandpaper, mix the samples according to the required ratio, stir for 5 minutes, and apply to the molded surface. The coating thickness should be 0.5–1.0 mm (it can be applied in two coats, with an interval not exceeding 24 hours). Then, cure the prepared specimens as required, without demolding, and prepare five specimens. After curing, use high-strength adhesive to attach the tensile clamp to the coating surface of the specimens, carefully removing any excess adhesive around the edges. Cure horizontally for 24 hours under standard test conditions. Then, cut the coating along the edge of the clamp down to the substrate, making the test area 40 × 40 mm.

[0020] 3. Surface drying time Before the test, the aluminum plate, tools, and coating should be placed under standard test conditions for at least 24 hours. Under standard test conditions, use a wire bar coater to apply the thoroughly mixed sample onto the aluminum plate to prepare a coating film, with a coating area of ​​100×50mm. Record the coating completion time. After standing for a period of time, wipe your fingers clean with anhydrous ethanol, and lightly touch the coating surface with your fingers within a range of at least 10mm from the edge of the specimen. If no coating adheres to your fingers, it is considered surface dry. Record the time; the time from the start to the end of the test is the surface drying time.

[0021] 4. Flame retardant properties Flame retardancy test (alcohol torch test procedure): First, mark a line 280 mm from the ignition end on the wide surface of the specimen. Then, insert the specimen into the holder, suspending it vertically with its lowest point 50 mm from the center of the alcohol torch nozzle, and tilt the alcohol torch at a 45° angle. The test is conducted in a combustion chamber under low light. Ignite the alcohol torch and adjust its flame height to 150–180 mm, with fuel consumption of 2.55 ± 0.15 mL / min. The burning time should be at least 5 seconds and no more than 60 seconds, based on the specimen igniting. After ignition, remove the unextinguished alcohol torch and, from this point, use a stopwatch to measure the flaming and extinguished burning times of the specimen and the dripping material, as well as the flame spread length.

[0022] Flame retardancy test (alcohol lamp test procedure): First, mark a line 280 mm from the ignition end on the wide surface of the specimen. Then, insert the specimen into the holder. If dripping from the specimen affects the test results, the alcohol lamp should be tilted at 20°, and the vertical distance from the bottom of the specimen to the center of the alcohol lamp head should be 19 mm. The test is conducted in a combustion chamber under low light. Light the alcohol lamp and adjust its flame height to 32 mm. The specimen is positioned in the center of the flame, with its leading edge aligned with the outer edge of the flame and perpendicular to the door of the combustion chamber, so that both sides of the specimen can be observed.

[0023] Place the specimen in a flame and ignite it. The ignition time depends on the thickness and hardness of the specimen, and is between 5 and 90 seconds (based on the time it takes for the specimen to ignite). Remove the unextinguished alcohol lamp and, from that point on, use a stopwatch to measure the flaming and non-flaming burning times of the specimen and the dripping material, as well as the flame spread length.

[0024] 5. Antistatic properties - surface resistance test Place the prepared specimen on an insulating plate slightly larger than the specimen, with the side with conductive adhesive (liquid) facing up. Clean the electrode base surface and place it on the adhesive-coated surface of the specimen. Connect the outer electrode to the grounding terminal or low-voltage terminal of the tester, and the inner electrode to the high-voltage terminal. After charging for 1 minute, measure the surface resistance. Then repeat the above test on the other side of the specimen and record the measured data.

[0025] In this invention, aluminate cement, as the core of rapid hardening, provides early strength, while hydration products endow the material base with high-temperature resistance and chemical corrosion resistance. Nano-silica, as an ultrafine active filler and structural reinforcing agent, undergoes a "volcanic ash reaction" with calcium hydroxide released during the hydration of aluminate cement, effectively sealing capillary pores. Polymer powder, as a toughening network and bonding core, disperses and re-emulsifies in the cement paste, ultimately forming a continuous, flexible, three-dimensional polymer film network. This organic network interpenetrates and interweaves with the aforementioned inorganic cementitious matrix, forming an "organic-inorganic interpenetrating network structure," which is the fundamental reason for the material's high toughness. Silicon carbide powder significantly improves the material's surface wear resistance and its ability to resist high-speed airflow and material erosion. Barium metaborate releases borate ions, forming a protective film in an alkaline environment, inhibiting corrosion of metals and providing some anti-mildew effect. Calcium formate, as a highly efficient early-strength agent, significantly promotes the early hydration of aluminate cement in low-temperature and humid environments, ensuring the material can rapidly build strength. Polyvinyl alcohol ensures that the slurry does not drip or separate during spraying, and prevents water loss too quickly, ensuring that the cement is fully hydrated and the polymer forms a complete film.

[0026] Other materials used in this invention, unless otherwise stated, are commercially available. Other terms used in this invention, unless otherwise specified, generally have the meanings commonly understood by those skilled in the art. The invention is further described in detail below with reference to specific embodiments and data. The following embodiments are merely illustrative and not intended to limit the scope of the invention in any way.

[0027] Example 1 A high-toughness, corrosion-resistant, airtight spray coating material is composed of the following raw materials by mass fraction: The composition consists of 30% inorganic cementitious materials, 6% functional fillers, 30% polymer powder, 1% quick-setting agent, 7.2% flame retardant, 0.8% polyvinyl alcohol, and 25% water.

[0028] The inorganic cementitious material is aluminate cement, model CA50-A600; the functional filler is nano-silica and silicon carbide powder, with a mass ratio of 1:1; the polymer powder is acrylic powder and vinyl acetate-ethylene copolymer powder, with a mass ratio of 1:1; the quick-setting agent is calcium formate; and the flame retardant is barium metaborate.

[0029] The above-mentioned high-toughness, corrosion-resistant, and airtight spray coating material is prepared by the following method: Inorganic cementitious materials, functional fillers, polymer powder, quick-setting agent, flame retardant, and polyvinyl alcohol are added to a mixer and stirred at 140 rpm for 1 minute until the powder is completely mixed. Then water is added and stirred at 140 rpm for 1 minute, then at 285 rpm for 4 minutes until a uniform slurry is formed, thus obtaining the spraying material.

[0030] In practical applications, a mixing and grinding machine can be used to spray the coating onto the target substrate using a one-line spraying method, allowing it to quickly react and solidify to form a flexible, sealed layer. Figure 1 As shown.

[0031] The performance parameters of the spraying material are shown in Table 1.

[0032] Table 1 Performance parameters of spray coating materials In Table 1 above, the acid corrosion resistance test was performed by soaking in 10% citric acid for 48 hours, 10% sulfuric acid for 48 hours, and 10% acetic acid for 48 hours, respectively; the chloride ion permeation flux was determined by the flux method.

[0033] Example 2 (PVA 0.7%) A high-toughness, corrosion-resistant, airtight spray coating material is composed of the following raw materials by mass fraction: The composition includes 30.1% inorganic cementitious materials, 6% functional fillers, 30% polymer powder, 1% quick-setting agent, 7.2% flame retardant, 0.7% polyvinyl alcohol, and 25% water.

[0034] The inorganic cementitious material is aluminate cement, model CA50-A600; the functional filler is nano-silica and silicon carbide powder, with a mass ratio of 1:1; the polymer powder is acrylic powder and vinyl acetate-ethylene copolymer powder, with a mass ratio of 1:1; the quick-setting agent is calcium formate; and the flame retardant is barium metaborate.

[0035] Example 3 (PVA 0.9%) A high-toughness, corrosion-resistant, airtight spray coating material is composed of the following raw materials by mass fraction: The composition includes 29.9% inorganic cementitious materials, 6% functional fillers, 30% polymer powder, 1% quick-setting agent, 7.2% flame retardant, 0.9% polyvinyl alcohol, and 25% water.

[0036] The inorganic cementitious material is aluminate cement, model CA50-A600; the functional filler is nano-silica and silicon carbide powder, with a mass ratio of 1:1; the polymer powder is acrylic powder and vinyl acetate-ethylene copolymer powder, with a mass ratio of 1:1; the quick-setting agent is calcium formate; and the flame retardant is barium metaborate.

[0037] Comparative Example 1 (PVA 0.6%) A spray coating material, by mass fraction, is composed of the following raw materials: The composition consists of 30.2% inorganic cementitious materials, 6% functional fillers, 30% polymer powder, 1% quick-setting agent, 7.2% flame retardant, 0.6% polyvinyl alcohol, and 25% water.

[0038] The inorganic cementitious material is aluminate cement, model CA50-A600; the functional filler is nano-silica and silicon carbide powder, with a mass ratio of 1:1; the polymer powder is acrylic powder and vinyl acetate-ethylene copolymer powder, with a mass ratio of 1:1; the quick-setting agent is calcium formate; and the flame retardant is barium metaborate.

[0039] Comparative Example 2 (PVA 1%) A spray coating material, by mass fraction, is composed of the following raw materials: Inorganic cementitious materials 29.8%, functional fillers 6%, polymer powder 30%, quick-setting agent 1%, flame retardant 7.2%, polyvinyl alcohol 1%, water 25%.

[0040] The inorganic cementitious material is aluminate cement, model CA50-A600; the functional filler is nano-silica and silicon carbide powder, with a mass ratio of 1:1; the polymer powder is acrylic powder and vinyl acetate-ethylene copolymer powder, with a mass ratio of 1:1; the quick-setting agent is calcium formate; and the flame retardant is barium metaborate.

[0041] Comparative Example 3 (lacking functional fillers) A spray coating material, by mass fraction, is composed of the following raw materials: The composition consists of 36% inorganic cementitious materials, 30% polymer powder, 1% quick-setting agent, 7.2% flame retardant, 0.8% polyvinyl alcohol, and 25% water.

[0042] The inorganic cementitious material is aluminate cement, model CA50-A600; the polymer powder is acrylic powder and vinyl acetate-ethylene copolymer powder, with a mass ratio of 1:1; the quick-setting agent is calcium formate; and the flame retardant is barium metaborate.

[0043] Comparative Example 4 (polymer powder dosage halved) A high-toughness, corrosion-resistant, airtight spray coating material is composed of the following raw materials by mass fraction: The composition consists of 45% inorganic cementitious materials, 6% functional fillers, 15% polymer powder, 1% quick-setting agent, 7.2% flame retardant, 0.8% polyvinyl alcohol, and 25% water.

[0044] The inorganic cementitious material is aluminate cement, model CA50-A600; the functional filler is nano-silica and silicon carbide powder, with a mass ratio of 1:1; the polymer powder is acrylic powder and vinyl acetate-ethylene copolymer powder, with a mass ratio of 1:1; the quick-setting agent is calcium formate; and the flame retardant is barium metaborate.

[0045] Comparative Example 5 (lacking accelerator) A high-toughness, corrosion-resistant, airtight spray coating material is composed of the following raw materials by mass fraction: The composition consists of 31% inorganic cementitious materials, 6% functional fillers, 30% polymer powder, 7.2% flame retardant, 0.8% polyvinyl alcohol, and 25% water.

[0046] The inorganic cementitious material is aluminate cement, model CA50-A600; the functional filler is nano-silica and silicon carbide powder, with a mass ratio of 1:1; the polymer powder is acrylic powder and vinyl acetate-ethylene copolymer powder, with a mass ratio of 1:1; the flame retardant is barium metaborate.

[0047] Comparative Example 6 (flame retardant dosage halved) A high-toughness, corrosion-resistant, airtight spray coating material is composed of the following raw materials by mass fraction: The composition includes 33.6% inorganic cementitious materials, 6% functional fillers, 30% polymer powder, 1% quick-setting agent, 3.6% flame retardant, 0.8% polyvinyl alcohol, and 25% water.

[0048] The inorganic cementitious material is aluminate cement, model CA50-A600; the functional filler is nano-silica and silicon carbide powder, with a mass ratio of 1:1; the polymer powder is acrylic powder and vinyl acetate-ethylene copolymer powder, with a mass ratio of 1:1; the quick-setting agent is calcium formate; and the flame retardant is barium metaborate.

[0049] The performance parameters of the above-mentioned spraying materials are shown in Table 2.

[0050] Table 2 Comparison and Analysis of Performance Parameters of Various Spraying Materials As shown in Table 2: The spraying material of Example 1 has a surface drying time of 35 minutes, an elongation at break of 50%, and a tensile strength of 5.8 MPa, exhibiting excellent performance.

[0051] Compared with the sprayed material of Example 1, the elongation at break decreased to 28%, the tensile strength decreased to 5.1 MPa, and the bonding strength decreased to 0.85 MPa. This indicates that the amount of PVA used was insufficient, and it was unable to effectively construct a flexible network and a strong interfacial bonding layer throughout the entire system, and the material was too rigid.

[0052] The elongation at break of the sprayed material in Comparative Example 2 dropped sharply to 18.2%, and the material became brittle. This was due to the excessive self-aggregation of PVA molecules, which disrupted the continuity of the polymer film and led to brittleness.

[0053] Compared to the sprayed material in Example 3, most of its mechanical properties failed to meet the standards, and its elongation at break dropped sharply. This indicates that nano-silica and similar materials are indispensable functional fillers. As functional components, they play a key role in synergistic reinforcement, improving flame retardancy, and significantly enhancing antistatic properties, and their effects are irreplaceable.

[0054] The coating material in Comparative Example 4 failed to meet most of its mechanical properties. This indicates that the polymer powder was insufficient, making it impossible to form a complete flexible "skeleton".

[0055] The surface drying time of the sprayed material in Comparative Example 5 was greater than 60 minutes. Accelerators are crucial for controlling workability; without the addition of calcium formate, the surface drying time exceeds 60 minutes, failing to meet the requirements for rapid downhole construction. Although its flexibility and strength remain good, the excessively long setting time is unacceptable for engineering applications.

[0056] The spraying material in Comparative Example 6 did not meet the flame retardant requirements. Sufficient flame retardant dosage is necessary to ensure the highest flame retardant rating.

[0057] In summary, the spraying material prepared by this invention meets the requirements in six key performance indicators: toughness, adhesion, rapid application, corrosion resistance, high flame retardancy, and excellent antistatic properties. In particular, it achieves remarkable technical results in toughness while also ensuring high mechanical strength.

[0058] Application examples The prepared high-toughness, corrosion-resistant, and airtight spray coating material was applied to the coal mine project of Shanxi Hengtai Queen Coal Industry. Figure 2 It is known that the spraying material can effectively cover the anchor mesh and metal components, achieving a complete seal on the surface of the metal components and coal and rock mass, preventing the anchor mesh and metal components from rusting and weathering, preventing the leakage of toxic and harmful media, and effectively preventing the surface cracking, air leakage and spontaneous combustion of flammable or high-temperature coal and rock masses.

[0059] In summary, the coating material formulation of this invention achieves multi-level and multi-scale synergy through ingenious component design: Nano- to micro-scale synergy: Nano-silica fills the finest pores and participates in chemical reactions, while silicon carbide micropowder enhances and toughens at the micro-scale. Together, they construct an extremely dense inorganic framework with gradient enhancement from the nano to the micro-scale.

[0060] Organic-inorganic network synergy: A high proportion of compounded polymer powders forms a flexible network that runs through the entire inorganic framework, achieving a balance between rigidity and flexibility. The rigid framework provides strength and support, while the flexible network provides toughness and crack resistance. The two complement each other, enabling the material to possess excellent mechanical properties of high compressive strength and high tensile strength.

[0061] Synergistic effect of early and long-term performance: Calcium formate and PVA ensure ease of construction and rapid early strength development; while the pozzolanic reaction of nano-silica and the long-term anti-corrosion effect of barium metaborate ensure the long-term strength growth and durability of the material.

[0062] Synergistic Functional Enhancement: Silicon carbide focuses on physical wear resistance and high-temperature stability, while barium metaborate focuses on chemical corrosion prevention and flame retardancy. Together, they enhance the overall protective life of the material in harsh downhole conditions from both physical and chemical dimensions.

[0063] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A high-toughness, corrosion-resistant mining wall spraying material, characterized in that, Composed of the following raw materials by mass fraction: The composition consists of 20-40% inorganic cementitious materials, 5-10% functional fillers, 15-35% polymer powder, 0.5-5% quick-setting agent, 4-10% flame retardant, 0.1-5% polyvinyl alcohol, and 10-40% water.

2. The high-toughness and corrosion-resistant mining wall spraying material according to claim 1, characterized in that, The high-toughness, corrosion-resistant, airtight spray coating material is composed of the following raw materials by mass fraction: The composition consists of 30% inorganic cementitious materials, 6% functional fillers, 30% polymer powder, 1% quick-setting agent, 7.2% flame retardant, 0.8% polyvinyl alcohol, and 25% water.

3. The high-toughness and corrosion-resistant mining wall spraying material according to claim 1, characterized in that, The inorganic cementitious material is at least one of aluminate cement, sulfoaluminate cement, and phosphate cement.

4. The high-toughness and corrosion-resistant mining wall spraying material according to claim 1, characterized in that, The functional filler is at least one of nano-silica, silicon carbide powder, nano-calcium carbonate, and diamond powder.

5. The high-toughness and corrosion-resistant mining wall spraying material according to claim 1, characterized in that, The polymer powder is at least one of acrylic powder, vinyl acetate-ethylene copolymer powder, epoxy resin powder, butadiene and styrene copolymer powder.

6. The high-toughness and corrosion-resistant mining wall spraying material according to claim 5, characterized in that, The polymer powder is acrylic powder and vinyl acetate-ethylene copolymer powder, with a mass ratio of 1:

1.

7. The high-toughness and corrosion-resistant mining wall spraying material according to claim 1, characterized in that, The quick-setting agent is at least one of sodium hydroxide, sodium carbonate, calcium formate, and sodium sulfate.

8. The high-toughness and corrosion-resistant mining wall spraying material according to claim 1, characterized in that, The flame retardant is at least one of melamine, barium metaborate, decabromodiphenyl ethane, and antimony trioxide.

9. The preparation method of the high-toughness and corrosion-resistant mining wall spraying material according to claim 1, characterized in that, The steps are as follows: Inorganic cementitious materials, functional fillers, polymer powder, quick-setting agent, flame retardant, and polyvinyl alcohol are mixed and stirred evenly. Then water is added and stirred evenly to obtain the spraying material.

10. The application of the high-toughness and corrosion-resistant mining wall spraying material of claim 1 in the rapid construction of sealing structures, filling of surrounding rock fissures, or sealing of leakage channels.

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