Deep coal seam resistance-dust suppression integrated eutectic-based material and preparation method thereof

Abstract

The application discloses a deep coal seam resistance-dust suppression integrated eutectic base material and a preparation method thereof, which comprises components A and B; the component A is composed of a hydrogen bond donor and a hydrogen bond acceptor, and the molar ratio of the two is (1.5-2.5):1; the component B is composed of an antioxidant, a thickening agent and a surfactant, and the mass ratio of the three is 1:(1-6):(1-4); and the mass ratio of the components A and B is (15-25):1. Under the joint action of the above material, the material prepared by the application not only has the ability of inhibiting spontaneous combustion and dust suppression, forms a resistance-dust suppression integrated technology, does not affect the quality of raw coal, reduces the working procedure in the mine, and improves the systematicness and economy of disaster prevention and control.

Description

Technical Field

[0001] This invention belongs to the field of coal mine spontaneous combustion prevention and dust suppression technology, and particularly relates to a low eutectic base material integrating deep coal seam inhibition and dust suppression and its preparation method. Background Technology

[0002] Currently, coal mines are gradually shifting towards deeper mining, but deep mines face challenges such as high ground stress and high ground temperature. High ground stress increases the fragility and plasticity of coal and rock, leading to slow face advance and prolonged coal oxidation time. Meanwhile, mine ground temperature increases linearly with mining depth, generally exceeding 40℃. This increased surrounding rock temperature alters the coal's heat storage conditions, creating a temperature difference between the coal and the working face airflow, resulting in hot air pressure. This further exacerbates air leakage and oxygen supply, increasing the coal's oxidative heat release activity and shortening the coal seam's spontaneous combustion cycle. Simultaneously, the increased stress in the original rock and tectonic structure deepens the deformation and damage of hard rock, leading to severe coal fragility and pulverized structure characteristics. Furthermore, the increased mechanization and mining intensity make the coal face the location with the highest dust generation in underground coal mines, with initial dust concentrations reaching as high as 8000 mg / m³. 3 This exceeds half of the total dust generated underground.

[0003] Currently, these two types of disasters are mainly addressed through a separate management strategy, without establishing a complete and systematic collaborative governance system. This involves using inhibitors to prevent coal spontaneous combustion and dust suppressants to inhibit dust pollution, but this separate approach has many drawbacks. Firstly, single technologies often have limited functionality and are unable to cope with the complex and ever-changing underground environment. While halide-based inhibitors can form a liquid film on the coal surface to isolate oxygen, they suffer from drawbacks such as easy loss, equipment corrosion, and groundwater pollution. Inorganic gel-based inhibitors have problems such as poor permeability and high cost; some inhibitors even alter the molecular structure of the coal after combining with it, thus reducing coal quality. Dust suppressants are mostly surfactants or polymers, which can effectively wet dust particles, but some products have poor biodegradability, causing secondary pollution to the environment. Secondly, implementing multiple technologies in parallel is not only cumbersome and costly, but also fails to systematically solve the two major problems of dust suppression and fire prevention. Furthermore, incompatibility effects may arise due to material interactions, affecting the effectiveness of the solutions. Therefore, developing green and efficient materials that combine both chemical inhibition and dust suppression functions without affecting the quality of raw coal, and achieving the goal of systematic and synergistic governance of spontaneous combustion suppression and dust control, has become an urgent need for the green and safe development of the coal industry.

[0004] In summary, how to prepare a low-eutectic base material that integrates inhibition and dust suppression in deep coal seams, so that it not only has the ability to inhibit spontaneous combustion and reduce dust, forming an integrated inhibition and dust suppression technology, without affecting the quality of raw coal, but also reduces underground operation procedures, and improves the systematicness and economy of disaster prevention and control, meets the development needs of enterprises to reduce costs and increase efficiency, and is in line with the green and safe development orientation of the coal industry, is one of the key research directions in this industry. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the deficiencies and defects mentioned in the background art above, and to provide a low eutectic base material for deep coal seam inhibition and dust suppression and its preparation method.

[0006] To solve the above-mentioned technical problems, the technical solution proposed by this invention is as follows: A low-eutectic base material integrating deep coal seam inhibition and dust suppression, comprising components A and B; Component A consists of a hydrogen bond donor and a hydrogen bond acceptor, with a molar ratio of (1.5~2.5):1. Component B is composed of antioxidants, thickeners and surfactants in a mass ratio of 1:(1~6):(1~4). The mass ratio of component A to component B is (15~25):1.

[0007] As a further improvement, the hydrogen bond donor is one of lactic acid, citric acid, glycerol, and glucose.

[0008] As a further improvement, the hydrogen bond acceptor is one of choline chloride, betaine, proline, or an amino acid.

[0009] As a further improvement, the antioxidant is one or a mixture of several of ferulic acid, ascorbic acid, tea polyphenols, anthocyanins, and luteolin.

[0010] As a further improvement, the thickener is one or a mixture of two of sodium alginate, hydroxypropyl methylcellulose, and sodium carboxymethyl cellulose.

[0011] As a further improvement, the surfactant is one of sodium dodecylbenzenesulfonate, sodium dodecyl sulfate, and sodium α-alkenylsulfonate.

[0012] The present invention also provides a method for preparing the integrated deep coal seam inhibition-dust suppression low eutectic base material, comprising the following steps: (1) Dry mix the hydrogen bond donor and hydrogen bond acceptor until homogeneous, then add water to dissolve them to obtain a solution of component A; (2) Dry mix the antioxidant, thickener and surfactant evenly to obtain component B; (3) Add component B to the solution of component A, stir until it becomes a uniform liquid mixture, and obtain the deep coal seam inhibition-dust suppression integrated low eutectic base material.

[0013] As a further improvement, in step (1), water is added at a water-cement ratio of (5~8):1.

[0014] As a further improvement, after adding water in step (1), the mixture is placed in an environment of 85~95°C until it becomes a homogeneous liquid mixture.

[0015] As a further improvement, after stirring evenly in step (3), the mixture is placed in an environment of 85~95℃.

[0016] This invention employs a combination of materials to form an integrated low-eutectic solvent for deep coal seam inhibition and dust suppression. Hydrogen bond donors and acceptors are the basic components forming the low-eutectic solvent. The aqueous low-eutectic solvent acts as a liquid carrier for natural antioxidants, and the addition of these natural antioxidants enhances the strength of the hydrogen bond network within the aqueous low-eutectic solvent, resulting in excellent inhibition properties. Surfactants enhance the material's impregnation ability; their superior penetration and wetting capabilities promote better penetration into the coal seam. Thickeners increase the material's viscosity, enhancing its adhesion after contact with the coal seam, thus providing excellent dust suppression performance. Through the combined action of these materials, the material produced by this invention not only inhibits spontaneous combustion and reduces dust, forming an integrated inhibition-dust suppression technology without affecting the quality of raw coal, but also reduces underground operation procedures, improves the systematicness and economy of disaster prevention and control, meets the development needs of enterprises for cost reduction and efficiency improvement, and aligns with the green and safe development direction of the coal industry.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) This invention has highly efficient inhibition performance. After the hydrogen bond donor and hydrogen bond acceptor fuse to form a eutectic solvent, it serves as a carrier for natural antioxidants. The polar functional groups such as hydroxyl and phenolic hydroxyl groups in the natural antioxidant molecules can act as additional hydrogen bond donors or acceptors, interacting with the original hydrogen bond donors and acceptors in the eutectic solvent to form a more dense and stable three-dimensional hydrogen bond network structure at the molecular level. The addition of thickener and surfactant makes it easier for the material to penetrate into the coal seam and firmly adhere to the coal surface, forming a stable barrier layer. By slowing down the evaporation of water and reducing the oxygen dissolution rate, the contact between coal and oxygen is reduced. At the same time, the hydrogen bond donor in the material interacts strongly with the active hydrogen bond sites on the surface of coal molecules to form a stable hydrogen bond complex. This not only occupies the active adsorption sites on the coal surface and blocks the direct contact between free radicals on the coal surface and oxygen molecules, but also fundamentally inhibits the chemical adsorption process of oxygen by coal, blocking the occurrence of the exothermic oxidation reaction, thus achieving the purpose of inhibition.

[0018] (2) This invention can effectively prevent spontaneous combustion for a long time. When the temperature in the goaf rises, it will cause a large number of hydrogen bond networks in the eutectic matrix material to break. The breaking of hydrogen bonds will absorb a large amount of heat and release a large amount of moisture, thus terminating the heating process. At this time, some of the broken hydrogen bonds will rearrange with the active hydrogen bond sites on the surface of the coal to form a more stable structure. When the hydrogen bond network is completely broken, the eutectic matrix material will release antioxidants. Some antioxidants will undergo a reduction reaction, consuming some oxygen, and some antioxidants will release hydrogen atoms to undergo an oxidation reaction to produce peroxides, interrupting the chain reaction and giving it the ability to continuously prevent spontaneous combustion.

[0019] (3) This invention has long-lasting dust suppression performance. By adding surfactants, the molecular arrangement on the surface of the material is changed, improving the wettability and penetration ability of the material, making it easier for the material to penetrate into micro-cracks; while thickeners can increase the viscosity of the material, and at the same time, the hydrogen bond donors in the material form strong hydrogen bond interactions with the active hydrogen bond sites on the surface of coal molecules, making the material firmly bonded to the coal body. During the mining operation, the dust generated is quickly wetted, agglomerated, and settled by the moisture released by the breaking of the hydrogen bond network in the material, greatly reducing the amount of dust at the working face, thereby improving the working environment.

[0020] (4) This invention can systematically and synergistically control dust and coal spontaneous combustion. By forming a three-dimensional hydrogen bond network through strong hydrogen bond interaction between the low eutectic base material and the active hydrogen bond sites on the surface of coal molecules, a large amount of moisture and antioxidants are stored. Combined with the auxiliary effect of additives, after the material is injected into the coal seam before mining, it can penetrate deep into the coal seam fissures and strongly adhere to the coal surface. During mining, the internal structure of some low eutectic materials attached to the coal surface breaks, releasing moisture to quickly wet, agglomerate, and settle the coal dust, thus achieving the purpose of dust suppression. After mining, the low eutectic base material attached to the residual coal forms an oxygen barrier layer and occupies the active adsorption sites on the coal surface, blocking the occurrence of oxidation reaction and achieving the purpose of inhibition. Even if the ambient temperature of the goaf rises, the hydrogen bonds in the low eutectic base material break, releasing moisture to absorb a large amount of heat and lowering the ambient temperature. At the same time, the released antioxidants react with oxygen in the environment, interrupting the chain reaction of coal oxidation and achieving the goal of inhibiting spontaneous combustion. Through a systematic approach to controlling the entire process of dust suppression, efficient chemical inhibition, and long-term suppression of spontaneous combustion, the incompatibility between materials is eliminated, achieving the goal of systematic and collaborative management of dust and coal spontaneous combustion. Simultaneously, it reduces underground work procedures and lowers labor costs, achieving cost reduction and efficiency improvement, aligning with current development prospects.

[0021] (5) This invention will not affect the combustion quality of raw coal. The hydrogen bond donors in the material interact strongly with the active hydrogen bond sites on the surface of coal molecules, forming a hydrogen bond network. Hydrogen bonds are not ordinary intermolecular forces in the traditional sense, but a type of directional weak interaction that combines electrostatic interaction and some covalent characteristics. Its interaction strength is higher than van der Waals forces, and it is different from irreversible chemical bonds. Therefore, the material can be stably adsorbed onto the surface of the coal through hydrogen bonds, and can be broken and dissociated by washing with water without changing the macromolecular structure of the raw coal. Therefore, this material will not affect the calorific value, combustion efficiency and other key indicators of raw coal, and can effectively maintain the economic benefits of coal resource mining while ensuring the effectiveness of disaster prevention and control.

[0022] (6) This invention meets the requirements of safety, environmental protection, greenness, and pollution-free operation in underground mines. Currently, most inhibitors are mainly synthetic chemical inhibitors, which generally have drawbacks such as irritating odor, corrosiveness, ecotoxicity, or difficulty in degradation, making them difficult or even impossible to use in underground environments. However, the hydrogen bond donors and acceptors used in this material are all green, environmentally friendly, non-toxic, biodegradable, and environmentally friendly materials. The antioxidants are all naturally extracted antioxidants, and the small amounts of thickeners and surfactants added are also non-toxic and biodegradable, meeting the urgent needs of the current coal industry for green and safe development. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the invention. Detailed Implementation

[0025] To facilitate understanding of the present invention, the present invention will be described more fully and in detail below with reference to the accompanying drawings and preferred embodiments, but the scope of protection of the present invention is not limited to the following specific embodiments.

[0026] Unless otherwise defined, all technical terms used herein have the same meaning as commonly understood by those skilled in the art. The technical terms used herein are for the purpose of describing particular embodiments only and are not intended to limit the scope of the invention.

[0027] Unless otherwise specified, all raw materials, reagents, instruments and equipment used in this invention can be purchased from the market or prepared by existing methods.

[0028] In some specific embodiments, the deep coal seam inhibition-dust suppression integrated low eutectic base material of the present invention includes components A and B.

[0029] Component A consists of a hydrogen bond donor and a hydrogen bond acceptor in a molar ratio of (1.5~2.5):1, preferably 2:1. The hydrogen bond donor is one of lactic acid, citric acid, glycerol, and glucose. The hydrogen bond acceptor is one of choline chloride, betaine, proline, and an amino acid.

[0030] Component B is composed of an antioxidant, a thickener, and a surfactant in a mass ratio of 1:(1~6):(1~4), preferably 1:3:2. The antioxidant is one or a mixture of several of ferulic acid, ascorbic acid, tea polyphenols, anthocyanins, and luteolin. The thickener is one or a mixture of two of sodium alginate, hydroxypropyl methylcellulose, and sodium carboxymethyl cellulose. The surfactant is one of sodium dodecylbenzene sulfonate, sodium dodecyl sulfate, and sodium α-alkenyl sulfonate.

[0031] The mass ratio of components A to B is (15~25):1, preferably 20:1.

[0032] The preparation method of the above-mentioned deep coal seam integrated inhibition-dust suppression low eutectic base material includes the following specific steps: (1) Preparation of component A: Dry mix the hydrogen bond donor and hydrogen bond acceptor to ensure uniform mixing. Add pure water at a water-cement ratio of (5~8):1 (mass ratio) and place in an environment of 85~95℃ until it becomes a uniform liquid mixture to obtain a solution of component A.

[0033] (2) Preparation of component B: Dry mix the antioxidant, thickener and surfactant until they are evenly mixed.

[0034] (3) Pour the uniformly mixed component B into the solution of component A, which has become a liquid homogeneous mixture. After stirring evenly, place it in an environment of 85~95℃ until it becomes a homogeneous liquid mixture, and obtain the low eutectic base material for deep coal seam inhibition-dust suppression.

[0035] Example 1: Preparation of component A: Citric acid was selected as the hydrogen bond donor and proline as the hydrogen bond acceptor. They were weighed and placed in a dry mixer at a molar ratio of 2:1 and stirred for a certain period of time to ensure uniform mixing. After stirring, the mixture was placed in a high-temperature resistant container and pure water was added at a water-cement ratio of 7:1. Then, the container was placed in an oven at a temperature of 90°C. After the mixture became a uniform liquid mixture, it was removed and set aside for later use.

[0036] Preparation of Component B: Weigh the antioxidant (ferulic acid and luteolin, mass ratio 1:1), thickener (sodium alginate and sodium carboxymethyl cellulose, mass ratio 1:3), and surfactant (sodium dodecyl sulfate) into a dry mixer at a mass ratio of 1:3:1 and stir for a certain period of time until they are evenly mixed. Then weigh the corresponding Component B according to the mass ratio of Component A to Component B of 20:1 and set it aside for later use.

[0037] The uniformly mixed component B was poured into the solution of component A, which had become a homogeneous liquid mixture. After stirring evenly, the mixture was placed in an oven at 90°C until it became a homogeneous liquid mixture, thus obtaining a low-eutectic base material integrating inhibition and dust suppression in deep coal seams. Subsequently, tests were conducted on inhibition rate, dust generation rate, and water retention rate. Specific data are shown in Table 1.

[0038] Example 2: Preparation of component A: Citric acid was selected as the hydrogen bond donor and proline as the hydrogen bond acceptor. They were weighed and placed in a dry mixer at a molar ratio of 2:1 and stirred for a certain period of time to ensure uniform mixing. After stirring, the mixture was placed in a high-temperature resistant container and pure water was added at a water-cement ratio of 7:1. Then, the container was placed in an oven at a temperature of 90°C. After the mixture became a uniform liquid mixture, it was removed and set aside for later use.

[0039] Preparation of Component B: Weigh the antioxidant (ferulic acid and luteolin, mass ratio 1:1), thickener (sodium alginate and sodium carboxymethyl cellulose, mass ratio 1:3), and surfactant (sodium dodecyl sulfate) into a dry mixer at a mass ratio of 1:1.5:1 and stir for a certain period of time until they are evenly mixed. Then weigh the corresponding Component B according to the mass ratio of Component A to Component B of 20:1 and set it aside for later use.

[0040] The uniformly mixed component B was poured into the solution of component A, which had become a homogeneous liquid mixture. After stirring evenly, the mixture was placed in an oven at 90°C until it became a homogeneous liquid mixture, thus obtaining a low-eutectic base material integrating inhibition and dust suppression in deep coal seams. Subsequently, tests were conducted on inhibition rate, dust generation rate, and water retention rate. Specific data are shown in Table 1.

[0041] Example 3: Preparation of component A: Citric acid was selected as the hydrogen bond donor and proline as the hydrogen bond acceptor. They were weighed and placed in a dry mixer at a molar ratio of 2:1 and stirred for a certain period of time to ensure uniform mixing. After stirring, the mixture was placed in a high-temperature resistant container and pure water was added at a water-cement ratio of 7:1. Then, the container was placed in an oven at a temperature of 90°C. After the mixture became a uniform liquid mixture, it was removed and set aside for later use.

[0042] Preparation of Component B: Weigh the antioxidant (ferulic acid and luteolin, mass ratio 1:1), thickener (sodium alginate and sodium carboxymethyl cellulose, mass ratio 1:3), and surfactant (sodium dodecyl sulfate) into a dry mixer at a mass ratio of 1:1:1 and mix for a certain period of time until they are evenly mixed. Then weigh the corresponding Component B according to the mass ratio of Component A to Component B of 20:1 and set it aside for later use.

[0043] The uniformly mixed component B was poured into the solution of component A, which had become a homogeneous liquid mixture. After stirring evenly, the mixture was placed in an oven at 90°C until it became a homogeneous liquid mixture, thus obtaining a low-eutectic base material integrating inhibition and dust suppression in deep coal seams. Subsequently, tests were conducted on inhibition rate, dust generation rate, and water retention rate. Specific data are shown in Table 1.

[0044] Example 4: Preparation of component A: Citric acid was selected as the hydrogen bond donor and proline as the hydrogen bond acceptor. They were weighed and placed in a dry mixer at a molar ratio of 2:1 and stirred for a certain period of time to ensure uniform mixing. After stirring, the mixture was placed in a high-temperature resistant container and pure water was added at a water-cement ratio of 7:1. Then, the container was placed in an oven at a temperature of 90°C. After the mixture became a uniform liquid mixture, it was removed and set aside for later use.

[0045] Preparation of Component B: Weigh the antioxidant (ferulic acid and luteolin, mass ratio 1:1), thickener (sodium alginate and sodium carboxymethyl cellulose, mass ratio 1:3), and surfactant (sodium dodecyl sulfate) into a dry mixer at a mass ratio of 1:3:2 and stir for a certain period of time until they are evenly mixed. Then weigh the corresponding Component B according to the mass ratio of Component A to Component B of 20:1 and set aside for later use.

[0046] The uniformly mixed component B was poured into the solution of component A, which had become a homogeneous liquid mixture. After stirring evenly, the mixture was placed in an oven at 90°C until it became a homogeneous liquid mixture, thus obtaining a low-eutectic base material integrating inhibition and dust suppression in deep coal seams. Subsequently, tests were conducted on inhibition rate, dust generation rate, and water retention rate. Specific data are shown in Table 1.

[0047] Example 5: Preparation of component A: Citric acid was selected as the hydrogen bond donor and proline as the hydrogen bond acceptor. They were weighed and placed in a dry mixer at a molar ratio of 2:1 and stirred for a certain period of time to ensure uniform mixing. After stirring, the mixture was placed in a high-temperature resistant container and pure water was added at a water-cement ratio of 7:1. Then, the container was placed in an oven at a temperature of 90°C. After the mixture became a uniform liquid mixture, it was removed and set aside for later use.

[0048] Preparation of Component B: Weigh the antioxidant (ferulic acid and luteolin, mass ratio 1:1), thickener (sodium alginate and sodium carboxymethyl cellulose, mass ratio 1:3), and surfactant (sodium dodecyl sulfate) into a dry mixer at a mass ratio of 0.5:3:2 and stir for a certain period of time until they are evenly mixed. Then weigh the corresponding Component B according to the mass ratio of Component A to Component B of 20:1 and set it aside for later use.

[0049] The uniformly mixed component B was poured into the solution of component A, which had become a homogeneous liquid mixture. After stirring evenly, the mixture was placed in an oven at 90°C until it became a homogeneous liquid mixture, thus obtaining a low-eutectic base material integrating inhibition and dust suppression in deep coal seams. Subsequently, tests were conducted on inhibition rate, dust generation rate, and water retention rate. Specific data are shown in Table 1.

[0050] Example 6: Preparation of component A: Citric acid was selected as the hydrogen bond donor and proline as the hydrogen bond acceptor. They were weighed and placed in a dry mixer at a molar ratio of 2:1 and stirred for a certain period of time to ensure uniform mixing. After stirring, the mixture was placed in a high-temperature resistant container and pure water was added at a water-cement ratio of 7:1. Then, the container was placed in an oven at a temperature of 90°C. After the mixture became a uniform liquid mixture, it was removed and set aside for later use.

[0051] Preparation of Component B: Weigh the antioxidant (ferulic acid and luteolin, mass ratio 1:1), thickener (sodium alginate and sodium carboxymethyl cellulose, mass ratio 1:3), and surfactant (sodium dodecyl sulfate) into a dry mixer at a mass ratio of 2:3:2 and mix for a certain period of time until they are evenly mixed. Then weigh the corresponding Component B according to the mass ratio of Component A to Component B of 20:1 and set aside for later use.

[0052] The uniformly mixed component B was poured into the solution of component A, which had become a homogeneous liquid mixture. After stirring evenly, the mixture was placed in an oven at 90°C until it became a homogeneous liquid mixture, thus obtaining a low-eutectic base material integrating inhibition and dust suppression in deep coal seams. Subsequently, tests were conducted on inhibition rate, dust generation rate, and water retention rate. Specific data are shown in Table 1.

[0053] Comparative Example 1: Preparation of component A: Citric acid was selected as the hydrogen bond donor and proline as the hydrogen bond acceptor. They were weighed and placed in a dry mixer at a molar ratio of 2:1 and stirred for a certain period of time to ensure uniform mixing. After stirring, the mixture was placed in a high-temperature resistant container and pure water was added at a water-cement ratio of 7:1. Then, the container was placed in an oven at a temperature of 90°C. After the mixture became a uniform liquid mixture, it was removed and set aside for later use.

[0054] Preparation of component B: Without adding antioxidants, weigh the thickener (sodium alginate and sodium carboxymethyl cellulose, mass ratio 1:3) and surfactant (sodium dodecyl sulfate) into a dry mixer at a mass ratio of 3:2 and stir for a certain period of time until they are evenly mixed. Then weigh the corresponding component B according to the mass ratio of component A to component B of 20:1 and set it aside for later use.

[0055] The uniformly mixed component B was poured into the solution of component A, which had become a homogeneous liquid mixture. After stirring evenly, the mixture was placed in an oven at 90°C until it became a homogeneous liquid mixture, thus obtaining a low-eutectic base material integrating inhibition and dust suppression in deep coal seams. Subsequently, tests were conducted on inhibition rate, dust generation rate, and water retention rate. Specific data are shown in Table 1.

[0056] Comparative Example 2: Preparation of component A: Citric acid was selected as the hydrogen bond donor and proline as the hydrogen bond acceptor. They were weighed and placed in a dry mixer at a molar ratio of 2:1 and stirred for a certain period of time to ensure uniform mixing. After stirring, the mixture was placed in a high-temperature resistant container and pure water was added at a water-cement ratio of 7:1. Then, the container was placed in an oven at a temperature of 90°C. After the mixture became a uniform liquid mixture, it was removed and set aside for later use.

[0057] Preparation of component B: Without adding thickener, weigh the antioxidant (ferulic acid and luteolin, mass ratio 1:1) and surfactant (sodium dodecyl sulfate) into a dry mixer at a mass ratio of 2:2 and stir for a certain period of time until they are evenly mixed. Then weigh the corresponding component B according to the mass ratio of component A to component B of 20:1 and set it aside for later use.

[0058] The uniformly mixed component B was poured into the solution of component A, which had become a homogeneous liquid mixture. After stirring evenly, the mixture was placed in an oven at 90°C until it became a homogeneous liquid mixture, thus obtaining a low-eutectic base material integrating inhibition and dust suppression in deep coal seams. Subsequently, tests were conducted on inhibition rate, dust generation rate, and water retention rate. Specific data are shown in Table 1.

[0059] Comparative Example 3: Preparation of component A: Citric acid was selected as the hydrogen bond donor and proline as the hydrogen bond acceptor. They were weighed and placed in a dry mixer at a molar ratio of 2:1 and stirred for a certain period of time to ensure uniform mixing. After stirring, the mixture was placed in a high-temperature resistant container and pure water was added at a water-cement ratio of 7:1. Then, the container was placed in an oven at a temperature of 90°C. After the mixture became a uniform liquid mixture, it was removed and set aside for later use.

[0060] Preparation of Component B: Without adding surfactants, weigh the antioxidant (ferulic acid and luteolin, mass ratio 1:1) and thickener (sodium alginate and sodium carboxymethyl cellulose, mass ratio 1:3) into a dry mixer and stir for a certain period of time until they are evenly mixed. Then weigh the corresponding Component B according to the mass ratio of Component A to Component B of 20:1 and set it aside for later use.

[0061] The uniformly mixed component B was poured into the solution of component A, which had become a homogeneous liquid mixture. After stirring evenly, the mixture was placed in an oven at 90°C until it became a homogeneous liquid mixture, thus obtaining a low-eutectic base material integrating inhibition and dust suppression in deep coal seams. Subsequently, tests were conducted on inhibition rate, dust generation rate, and water retention rate. Specific data are shown in Table 1.

[0062] The test methods for the material's inhibition rate, dust generation rate, and water retention rate are as follows: (1) Resistance test The ZHCD-1 coal mine fire prevention and extinguishing material inhibition performance tester was used for testing. This instrument mainly consists of a gas supply system, a programmed temperature rise system, gas acquisition and analysis, and control software, and can directly test the inhibition rate of materials.

[0063] (2) Dust generation rate test The dust generation characteristics of coal and rock were tested using the laboratory testing method proposed by the Coal Research Institute: The processed coal sample was tested for dust generation rate by using a free-falling hammer from a fixed height to break the coal sample. The resulting coal dust was collected through a 200-mesh sieve, and its mass was measured and recorded as m. The mass of the original coal sample was recorded as M. The formula for calculating the dust generation rate is as follows:

[0064] Take coal samples that have been sieved to 2-5 mesh, weighing 50g for each group. One group is left untreated, while the other group is soaked in a different material for 48 hours. After processing, place the coal samples at the bottom of a dust generation tester. Raise the drop hammer to its highest point and allow it to fall freely for 10 consecutive drops. After every 5 drops, pour the coal sample through a 200-mesh sieve for sieving to obtain the dust generation amount. Calculate the dust generation rate of the coal sample by substituting the measured dust mass and the original coal sample mass into the formula.

[0065] (3) Water retention rate test The experiment used a WGZ-type precision forced-air drying oven to heat the two slurries within a temperature range of RT+10℃ to 300℃. No airflow was set in this experiment. An analytical balance was used to weigh the slurries before and after heating to measure their mass changes. To obtain the material's mass change with time and temperature, the water retention rate of the slurry was calculated by dividing the difference in slurry mass with temperature over a certain time period by the initial slurry mass. The formula is as follows:

[0066] In the formula, The water retention rate of the slurry, expressed as % %. The initial mass of the material is expressed in grams (g). This indicates the remaining mass of the slurry after a certain period of time, expressed in grams.

[0067] Prepare 80g of the material and place it in a drying oven for 36 hours. Considering that the critical temperature for spontaneous combustion of coal is between 60℃ and 80℃, the experiment was conducted at a constant temperature of 70℃ to observe and investigate the water retention of the material.

[0068] Table 1 Test data for each embodiment and comparative example

[0069] As shown in Table 1, comparing Examples 1 to 3, it can be observed that increasing the amount of thickener improves the inhibition rate and reduces the dust generation rate of the material, but has little effect on the water retention rate. In comparison, Example 1 exhibits a better integrated inhibition and dust suppression effect. Comparing Examples 1, 4, and 5, it can be found that increasing the amount of surfactant improves the inhibition rate, reduces the dust generation rate, and increases the water retention rate. However, excessive addition does not continuously improve the material performance, indicating that surfactants can better enable the material to penetrate the coal body. Example 4 exhibits better performance. Comparing Examples 4 and 6, it can be found that increasing the amount of antioxidant improves the inhibition rate and increases the water retention rate, but has little effect on the dust generation rate. Increasing the amount of antioxidant leads to a significant increase in cost, without achieving a substantial improvement in effect. Therefore, Example 4 has superior, economical, and efficient inhibition and dust suppression performance.

[0070] To investigate the synergistic effect between the components, three sets of comparative experiments were conducted and compared with Example 4. In Comparative Example 1, no antioxidant was added, resulting in a 16.83% decrease in inhibition rate, a 31.3% increase in dust generation rate, and a 58.59% decrease in water retention rate. This was mainly because the lack of antioxidant weakened the material's oxidation and reduction properties, making it difficult to interrupt the chain reaction of coal oxidation, and also reduced the material's water-holding capacity, leading to less water release from the broken three-dimensional hydrogen bond network. In Comparative Example 2, no thickener was added, resulting in a 14.37% decrease in inhibition rate, a 70.48% increase in dust generation rate, and a 46.17% decrease in water retention rate. This was mainly due to a reduced ability of the material to firmly adhere to the coal surface, making it difficult for the formed barrier layer to stably cover the coal surface, thus reducing dust suppression and inhibition performance. In Comparative Example 3, no surfactant was added, resulting in a 9.78% decrease in inhibition rate, a 111.45% increase in dust generation rate, and a 50.4% decrease in water retention rate. This was mainly due to a reduced wettability and penetration ability of the material, making it difficult for the material to penetrate into micro-cracks, thus reducing the material's performance.

[0071] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention in any way. Therefore, any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention should fall within the protection scope of the present invention.

Claims

1. A low-eutectic based material integrating deep coal seam inhibition and dust suppression, characterized in that, It includes components A and B; Component A consists of a hydrogen bond donor and a hydrogen bond acceptor, with a molar ratio of (1.5~2.5):

1. Component B is composed of antioxidants, thickeners and surfactants in a mass ratio of 1:(1~6):(1~4). The mass ratio of component A to component B is (15~25):

1.

2. The low-eutectic based material for integrated dust inhibition and dust suppression in deep coal seams according to claim 1, characterized in that, The hydrogen bond donor is one of lactic acid, citric acid, glycerol, or glucose.

3. The low-eutectic based material for integrated dust inhibition and dust suppression in deep coal seams according to claim 1, characterized in that, The hydrogen bond acceptor is one of choline chloride, betaine, proline, or an amino acid.

4. The low-eutectic based material for integrated dust inhibition and dust suppression in deep coal seams according to claim 1, characterized in that, The antioxidant is one or a mixture of several of the following: ferulic acid, ascorbic acid, tea polyphenols, anthocyanins, and luteolin.

5. The low-eutectic based material for integrated dust inhibition and inhibition in deep coal seams according to claim 1, characterized in that, The thickener is one or a mixture of two of sodium alginate, hydroxypropyl methylcellulose, and sodium carboxymethyl cellulose.

6. The low-eutectic based material for integrated dust inhibition and dust suppression in deep coal seams according to claim 1, characterized in that, The surfactant is one of sodium dodecylbenzenesulfonate, sodium dodecyl sulfate, and sodium α-olefin sulfonate.

7. A method for preparing a low-eutectic based material integrating inhibition and dust suppression in deep coal seams as described in any one of claims 1 to 6, characterized in that, The steps include the following: (1) Dry mix the hydrogen bond donor and hydrogen bond acceptor until homogeneous, then add water to dissolve them to obtain a solution of component A; (2) Dry mix the antioxidant, thickener and surfactant evenly to obtain component B; (3) Add component B to the solution of component A, stir until it becomes a uniform liquid mixture, and obtain the deep coal seam inhibition-dust suppression integrated low eutectic base material.

8. The method for preparing the integrated low-eutectic base material for deep coal seam inhibition and dust suppression according to claim 7, characterized in that, Step (1) Add water according to the water-cement ratio (5~8):

1.

9. The method for preparing the integrated low-eutectic base material for deep coal seam inhibition and dust suppression according to claim 7, characterized in that, After adding water in step (1), place it in an environment of 85~95℃ until it becomes a homogeneous liquid mixture.

10. The method for preparing the integrated low-eutectic base material for deep coal seam inhibition and dust suppression according to claim 7, characterized in that, After stirring evenly, place it in an environment of 85~95℃.

Images