High-temperature-resistant and wind-erosion-resistant composite coal mine dust suppressant material and preparation method thereof

Abstract

The invention relates to the technical field of coal mine dust suppression, in particular to a high-temperature-resistant and wind-erosion-resistant composite coal mine dust suppressant material and a preparation method thereof. The high-temperature-resistant and wind-erosion-resistant composite coal mine dust suppressant material is prepared from the following raw materials: trimethylolpropane (oxypropylene) triether, N-(3-hydroxypropyl) acrylamide, ethylene glycol dimethacrylate, a surfactant, an initiator, a humectant and water. The material aims at solving the technical problem that an existing dust suppression material is poor in film forming performance under the conditions of high temperature and wind erosion, the comprehensive effects that the excellent fluidity can still be kept even under the condition of high temperature, coal dust can be rapidly spread and wetted, and a tough and durable protective film can be formed are achieved, and tests prove that the film forming rate of the prepared material at the high temperature of 100 DEG C is 91% or above, and the material has a good application prospect. The wind erosion rate is lower than 5.5% at the wind speed of 12.8 m / s, and an efficient and reliable solution is provided for dust control of coal mines under the high-temperature condition.

Description

Technical Field

[0001] This invention relates to the field of coal mine dust suppression technology, specifically to a high-temperature resistant and wind-erosion resistant composite coal mine dust suppressant material and its preparation method. Background Technology

[0002] Coal dust pollution is a core environmental and safety challenge facing the coal mining industry. It not only causes significant losses of coal resources during mining, transportation, and storage, but also triggers irreversible respiratory diseases such as pneumoconiosis. Furthermore, it can potentially cause explosions under certain concentration conditions, posing a major danger. Simultaneously, coal dust corrodes tracks and electrical equipment, leading to locomotive overheating failures and significantly increasing operational safety hazards. With increasing coal mining depth, expanded open-pit mining scale, and upgraded long-distance transportation demands, the shortcomings of existing dust suppressants in terms of high-temperature resistance and wind erosion resistance are becoming increasingly apparent, making them unsuitable for complex operating conditions.

[0003] In response, Chinese patent application CN120718604A discloses a dust suppressant for open-pit coal mine truck transportation roads in high-temperature and dry environments and its preparation method. The dust suppressant is prepared by mixing 20-30% glucose (by mass), 0.05-0.15% penetrant, 1.5-2.5% water-retaining agent, 1.5-2.5% hygroscopic agent, and the remainder water. The dust suppressant in the above technical solution uses glucose as the main component, combined with hygroscopic and water-retaining agents, and can suppress road dust to a certain extent through wetting and moisture absorption. It also has advantages such as being environmentally friendly and low-cost. However, this type of dust suppressant mainly relies on moisture retention to achieve the dust suppression effect. The system lacks structural units that can form a stable and continuous film layer under high-temperature, dry, and strong wind disturbance conditions. Under conditions of high-temperature water loss or strong wind erosion, the dust suppression durability and resistance to disturbance still need further improvement.

[0004] Therefore, there is an urgent need to develop a new composite material for coal mine dust suppression that can maintain stable film-forming properties under high temperature conditions, while possessing high strength and high flexibility to resist wind erosion, and is cost-effective and environmentally friendly. Summary of the Invention

[0005] To address the technical problems of decreased wetting performance and poor film-forming properties of dust suppression materials under high temperature and wind erosion conditions, this invention discloses a high-temperature resistant and wind-erosion-resistant composite coal mine dust suppressant material and its preparation method. This material aims to solve the technical problems of poor film-forming properties of existing dust suppression materials under high temperature and wind erosion conditions, achieving a comprehensive effect of maintaining excellent fluidity, rapidly spreading and wetting coal dust, and forming a strong and durable protective film even under high temperature conditions. This provides an efficient and reliable solution for dust control in coal mines under high-temperature conditions.

[0006] A high-temperature resistant and wind-erosion resistant composite coal mine dust suppressant material includes the following raw materials: trimethylolpropane (oxypropylene) triether, N-(3-hydroxypropyl)acrylamide, ethylene glycol dimethacrylate, surfactant, initiator, humectant and water.

[0007] Furthermore, the high-temperature resistant and wind-erosion resistant composite coal mine dust suppressant material comprises the following raw materials in parts by weight: 0.03-0.07 parts of trimethylolpropane (oxypropylene) triether, 1-2 parts of N-(3-hydroxypropyl)acrylamide, 0.2-0.6 parts of ethylene glycol dimethacrylate, 0.1-0.2 parts of surfactant, 0.1-0.4 parts of initiator, 0.01-0.03 parts of humectant, and 200-220 parts of water.

[0008] Furthermore, the high-temperature resistant and wind-erosion resistant composite coal mine dust suppressant material comprises the following raw materials in parts by weight: 0.05 parts trimethylolpropane (oxypropylene) triether, 1.5 parts N-(3-hydroxypropyl)acrylamide, 0.5 parts ethylene glycol dimethacrylate, 0.15 parts surfactant, 0.2 parts initiator, 0.02 parts humectant, and 200 parts water.

[0009] Furthermore, the surfactant in the high-temperature resistant and wind-erosion-resistant composite coal mine dust suppressant material is sodium dodecyl sulfate.

[0010] Furthermore, the initiator of the high-temperature resistant and wind-erosion resistant composite coal mine dust suppressant material is ammonium persulfate.

[0011] Furthermore, the humectant in the high-temperature resistant and wind-erosion-resistant composite coal mine dust suppressant material is ammonium sulfate; the water is purified water.

[0012] Furthermore, the present invention also provides a method for preparing the high-temperature resistant and wind-erosion resistant composite coal mine dust suppressant material as described above, comprising the following steps: (1) Mix the surfactant and water to form a surfactant solution; (2) Under continuous stirring, add trimethylolpropane (oxypropylene) triether to the surfactant solution obtained in step (1), heat to 40-50℃ until the solution becomes transparent; then add N-(3-hydroxypropyl)acrylamide and continue stirring to ensure that the monomer is uniformly dispersed. (3) Keep the temperature at 40-50℃ and continue to add ethylene glycol dimethacrylate dropwise to step (2), and continue stirring to fully mix ethylene glycol dimethacrylate with the system; then raise the temperature of the system to 65-75℃ and add the initiator while stirring. After the initiator is added, keep the temperature and continue the reaction; after the reaction is completed, lower the temperature of the system to 40-50℃, add the humectant, and stir until completely dissolved to obtain a uniform viscous liquid; (4) Turn off the heating, stop stirring, let the system cool naturally to room temperature, filter, and obtain high temperature resistant and wind erosion resistant composite coal mine dust suppressant material.

[0013] Furthermore, the preparation method of the high-temperature resistant and wind-erosion resistant composite coal mine dust suppressant material also includes the following steps: placing trimethylolpropane (oxypropylene) triether in a vacuum drying oven at 60-70℃ for 2-3 hours to remove moisture.

[0014] Furthermore, in step (4), the product is filtered using a 100-mesh filter to remove unreacted particles or gel blocks.

[0015] Furthermore, the preparation method of the above-mentioned high-temperature resistant and wind-erosion resistant composite coal mine dust suppressant material includes the following steps: (1) Mix the surfactant and water and stir for 15-20 minutes until completely dissolved to form a surfactant solution; place the trimethylolpropane (oxypropylene) triether in a vacuum drying oven at 60-70℃ and dry for 2-3 hours; (2) Under continuous stirring, add the dried trimethylolpropane (oxypropylene) triether to the surfactant solution obtained in step (1), heat to 40-50℃, and stir for 30-40 min until the trimethylolpropane (oxypropylene) triether dissolves and the solution becomes transparent; then add N-(3-hydroxypropyl)acrylamide and continue stirring for 20-30 min to ensure uniform dispersion of the monomer; (3) Keep the temperature at 40-50℃ and continue to add ethylene glycol dimethacrylate dropwise to step (2), and continue stirring for 10-15 minutes to fully mix ethylene glycol dimethacrylate with the system; then raise the temperature of the system to 65-75℃ and add the initiator in 3 parts while stirring, with an interval of 10 minutes each time (ammonium persulfate is added in 3 parts at 65-75℃ to avoid the problem of "local bursting or incomplete polymerization caused by one-time addition" and effectively ensure the uniformity of the product). After the addition, keep the temperature and continue to react for 2-3 hours; after the reaction is completed, lower the temperature of the system to 40-50℃, add the humectant, and stir for 15-20 minutes until completely dissolved to obtain a uniform viscous liquid; (4) Turn off the heating and stop stirring. Let the system cool naturally to room temperature. Filter the product with a 100-mesh filter to obtain a high-temperature resistant and wind-erosion resistant composite coal mine dust suppressant material.

[0016] The raw materials selected in the preparation of the high-temperature resistant and wind-erosion-resistant composite coal mine dust suppressant material of this invention have the following characteristics: Trimethylolpropane (oxypropylene) triether has a flexible molecular chain and contains a large number of hydroxyl groups (-OH), making it a water-soluble polyether. At room temperature, it is a transparent, viscous liquid with excellent resistance to high and low temperatures. It exhibits good compatibility with water and polar monomers (such as N-(3-hydroxypropyl)acrylamide), without stratification or precipitation, effectively ensuring the homogeneity of the system. Furthermore, as a "bonding skeleton," it enhances the bonding strength of the final product, allowing the dust suppressant to adhere firmly to the dust surface after spraying, reducing wind erosion and detachment. Its temperature resistance can offset temperature shocks during the polymerization reaction, preventing structural decomposition and thus effectively participating in the reaction, thereby ensuring the stability of the dust suppressant during subsequent high-temperature dust suppression processes.

[0017] N-(3-hydroxypropyl)acrylamide is a bifunctional monomer possessing both carbon-carbon double bonds (polymerization activity) and hydroxyl and amide groups (functional groups). It exhibits excellent water solubility, readily dissolving in water and polyether solutions at room temperature. Its monomer reactivity is moderate, avoiding both incomplete polymerization due to low reactivity and localized burst polymerization due to excessive reactivity, thus facilitating polymerization control. As a core monomer in the polymerization reaction, N-(3-hydroxypropyl)acrylamide can form a long-chain backbone through double bond polymerization, providing the basic structure for three-dimensional networks. Furthermore, the polymerized product exhibits good flexibility, adapting to slight deformations in dust layers. It also demonstrates good compatibility with polyethers and crosslinking agents, allowing for uniform dispersion in the system and ensuring no localized performance differences in the final product.

[0018] Ethylene glycol dimethacrylate (EDGD) molecules contain a carbon-carbon double bond at each end, making it a typical "bifunctional crosslinking agent." It is a low-viscosity liquid at room temperature, exhibits good compatibility with monomers and polyethers, and is easily and uniformly dispersed. It possesses high chemical stability and will not decompose at the polymerization temperature of this invention. It participates in the reaction solely through its double bonds, resulting in controllable crosslinking efficiency. Furthermore, it can connect the long-chain free radicals formed by monomer polymerization, preventing disordered entanglement of the long chains and forming a regular three-dimensional network structure.

[0019] Ammonium persulfate is a thermally decomposable free radical initiator. It is a solid powder, readily soluble in water, and slowly decomposes at 60-80°C, continuously generating free radicals. Its decomposition products are ammonium ions, sulfate ions, and sulfate free radicals, containing no volatile toxic substances and thus not polluting dust suppressants or dusty environments. Furthermore, its high initiation efficiency allows for precise activation of the reaction within the polymerization temperature range, avoiding the problems of initiation failure at low temperatures and excessively rapid decomposition at high temperatures. This ensures a stable polymerization process, eliminating the need for additional catalysts in this invention. The decomposition rate can be adjusted solely through temperature control, simplifying operation and reducing preparation difficulty.

[0020] Sodium dodecyl sulfate is a typical anionic surfactant, and its molecule contains a hydrophilic group (sulfate radical -SO4). - ")" and "lipophilic group (dodecyl long chain - C 12 H 25It is easily soluble in water, produces moderate foam, reduces the surface tension of the liquid, and improves the compatibility between different components. It can evenly disperse monomers, crosslinking agents, etc. in the water-polyether system, avoiding excessively high local concentrations. This improves the "spreadability" of the dust suppressant during spraying, reduces the contact angle between the dust suppressant and the dust surface, and allows the liquid to cover the dust faster and more evenly, reducing "missed spray" areas.

[0021] Ammonium sulfate is an inorganic salt, a solid powder, readily soluble in water, and its aqueous solution is neutral. It exhibits good compatibility with other components and will not trigger polymer degradation or precipitation. Its hygroscopicity is moderate; it can absorb moisture from the air without causing excessive viscosity in the dust suppressant. It forms a "moisturizing film" on the dust surface by absorbing moisture, slowing down the evaporation rate and preventing the dust suppressant from losing its adhesiveness after drying. The ammonium ion (NH4+) formed after dissolution... + ) and sulfate (SO4) 2- It can form weak ionic bonds with the hydroxyl and amide groups of polymers, inhibiting the shrinkage or aggregation of polymer molecular chains and ensuring that the dust suppressant does not deteriorate during long-term storage.

[0022] The synthetic reaction route equation of this invention is shown below: ; Where R· represents sulfate radical (active radical), X represents the structure other than the carbon-carbon double bond in N-(3-hydroxypropyl)acrylamide, and M· represents the product of N-(3-hydroxypropyl)acrylamide chain growth.

[0023] The reaction principle of this invention: (1) First, during the polymerization initiation stage, ammonium persulfate (initiator) decomposes at 65-75℃ to generate sulfate free radicals ( SO4 - The catalyst attacks the carbon-carbon double bonds (C=C) of N-(3-hydroxypropyl)acrylamide to form monomer radicals. These radicals continuously connect to other monomers, forming linear polymer chains. The two sets of carbon-carbon double bonds in ethylene glycol dimethacrylate react with the radicals of the two linear polymer chains, transforming the linear chains into a three-dimensional network cross-linked polymer through a "bridging effect," ultimately forming a cross-linked network. This structure gives the dust suppressant the following advantages: the network skeleton can resist wind shear, reducing dust shearing; the network pores can adsorb and lock in moisture, prolonging the dust suppression effect; the high cross-linking density of the three-dimensional network is not easily softened or decomposed at high temperatures and can withstand environments above 100°C.

[0024] (2) Secondly, the hydroxyl groups (-OH) of trimethylolpropane (oxypropylene) triether are tightly bonded to the amide groups (-CONH) in the crosslinked polymer through hydrogen bonds. This bonding method achieves a dual locking of the "bonding skeleton" and the "three-dimensional network": the hydrogen bond makes the polyether and the polymer network form a whole, avoiding the separation of components due to external forces (such as wind); the hydrogen bond can absorb some heat, inhibit the movement of polymer chains at high temperatures, and improve the high temperature resistance of the system; furthermore, the hydrogen bond also contributes to the mechanical properties, and intermolecular hydrogen bonds can also be formed between the amide groups, further enhancing the cohesive energy density of the polymer, so that the dust suppressant forms a tough cured film after drying, effectively wrapping the dust particles.

[0025] Compared with the prior art, the present invention has the following beneficial effects: (1) This invention uses trimethylolpropane (oxypropylene) triether as the bonding skeleton, instead of polyvinyl alcohol or ordinary polyether commonly used in the prior art. This results in the film formation rate of the material prepared by this invention being above 91% at a high temperature of 100°C and the wind erosion rate being below 5.5% at a wind speed of 12.8 m / s, which is something that conventional adhesives cannot achieve. The polyhydroxy structure (-OH) of the raw material of this invention can form strong hydrogen bonds with the polymer, which significantly enhances the high temperature resistance of the dust suppression material and can effectively prevent the polymer structure from being decomposed at high temperatures. Moreover, it is tightly bound to the amide group (-CONH) of the cross-linked polymer through hydrogen bonds in the system, which effectively strengthens the integrity of the bonding skeleton and the three-dimensional network. Furthermore, its hydroxyl group (-OH) can form secondary hydrogen bonds with the polar groups on the dust surface, achieving firm adhesion on the dust surface and significantly improving the peel resistance efficiency of the dust suppression film.

[0026] (2) The present invention uses N-(3-hydroxypropyl)acrylamide as a bifunctional monomer. Its carbon-carbon double bond ensures polymerization activity, while the amide group forms intermolecular hydrogen bonds with the hydroxyl groups of trimethylolpropane (oxypropylene) triether, which solves the problem that existing monomers cannot achieve both polymerization activity and flexibility. At the same time, it breaks through the limitations of existing technologies that use single free radical polymerization, which have single product performance, are difficult to meet multiple needs, have low polymerization efficiency, produce many by-products, and are sensitive to reaction conditions and are easy to get out of control. The mechanism of free radical polymerization and hydrogen bonding proposed in this invention utilizes the carbon-carbon double bond (C=C) and amide group (-CONH) on the molecular chain of the functional monomer N-(3-hydroxypropyl)acrylamide. This provides efficient reaction sites for free radical polymerization and can form intermolecular hydrogen bonds with the hydroxyl groups of polyether. Simultaneously, it cross-links with the bifunctional groups of ethylene glycol dimethacrylate to construct a high-density three-dimensional network structure. This high-density three-dimensional network structure can effectively encapsulate dust particles and lock in moisture, forming a tough, wear-resistant, and high-temperature resistant polymer solidified layer. It can effectively resist wind shear damage, prevent dust from being re-raised, and extend the dust suppression time. At the same time, the flexibility of the monomer polymerization product ensures the adaptability of the dust suppression film to the deformation of the dust layer. Furthermore, the high-density cross-linked three-dimensional network structure is not easily softened or decomposed at high temperatures and can withstand environments above 100°C.

[0027] (3) The high-temperature resistant and wind-erosion resistant composite coal mine dust suppressant material prepared by the present invention achieves long chain construction and cross-linked network formation through free radical polymerization, and completes synergistic reinforcement between components by means of hydrogen bonding. The product has both high adhesion and structural stability. Relying on the moisturizing effect of ammonium sulfate and the dispersing and wetting effect of sodium dodecyl sulfate, the material can still maintain good fluidity, spreadability and long-lasting dust suppression performance in high temperature and windy environment. The dual effect of three-dimensional network and hydrogen bonding makes its dust suppression film have both mechanical strength and thermal stability, which can inhibit dust diffusion for a long time and greatly reduce the frequency of operation and overall cost of industrial dust control.

[0028] In summary, the high-temperature resistant and wind-erosion-resistant dust suppression material prepared by the method of this invention has many advantages, such as high film strength, good temperature resistance and wind erosion resistance, and long dust suppression effect. Attached Figure Description

[0029] Figure 1 This is a flowchart of the preparation process of the present invention; Figure 2 These are comparative results of wind erosion resistance experiments for Examples 1-9 and Comparative Examples 1-4; Figure 3 This is a high-temperature resistance test diagram for Example 8 and Comparative Examples 1-4; Figure 4The diagram shows the synthetic reaction route of this invention, where R· is a sulfate radical (active radical), X represents the structure other than the carbon-carbon double bond in N-(3-hydroxypropyl)acrylamide, and M· represents the product of N-(3-hydroxypropyl)acrylamide chain growth. Detailed Implementation

[0030] The present invention will be further described below through specific embodiments, but this is not a limitation of the present invention. Those skilled in the art can make various modifications or improvements based on the basic idea of ​​the present invention, but as long as they do not depart from the basic idea of ​​the present invention, they are all within the protection scope of the present invention.

[0031] Unless otherwise specified, the methods used in the following examples and comparative examples are all prior art; reagents not specifically mentioned are conventional reagents, all of which can be purchased from conventional reagent manufacturers and distributors. Information such as some raw material manufacturers and CAS numbers is as follows: Trimethylolpropane (oxypropylene) triether, purchased from Shanghai Maclean Biochemical Technology Co., Ltd., model: T723197, average molecular weight range is generally 400~20000 g / mol, CAS number: 25723-16-4. N-(3-hydroxypropyl)acrylamide, purchased from Alpha (Zhengzhou) Chemical Co., Ltd., model: A817994 (Alpha), CAS number: 44817-99-4; Ethylene glycol dimethacrylate, purchased from Sigma-Aldrich, model number: 335681 (Sigma-Aldrich), CAS number: 97-90-5.

[0032] Sodium dodecyl sulfate, CAS No.: 151-21-3; Ammonium persulfate, CAS No.: 7727-54-0; Ammonium sulfate, CAS No.: 7783-20-2.

[0033] This invention discloses a high-temperature resistant and wind-erosion-resistant composite coal mine dust suppressant material. The raw materials used include 1-2g N-(3-hydroxypropyl)acrylamide; 0.2-0.6g ethylene glycol dimethacrylate; 0.03-0.07g trimethylolpropane (oxypropylene) triether; 0.1-0.2g sodium dodecyl sulfate surfactant; 0.1-0.4g ammonium persulfate initiator; 0.01-0.03g ammonium sulfate humectant; and 200g distilled water. The raw material dosages of the high-temperature resistant and wind-erosion-resistant composite coal mine dust suppressant materials in Examples 1-9 of this invention are shown in the table below: Table 1. Raw material usage in Examples 1-9 of the present invention.

[0034] like Figure 1 The preparation process flow diagram of this invention is shown. In the preparation process of this invention, sodium dodecyl sulfate is first added to distilled water and stirred until completely dissolved to form a surfactant solution. Then, pre-treated trimethylolpropane (oxypropylene) triether is added to the surfactant solution, and the temperature is raised to 40-50°C. The mixture is stirred until a transparent solution is formed. Subsequently, N-(3-hydroxypropyl)acrylamide is added and stirred for 20-30 minutes to allow the monomer to diffuse into the transparent solution. The temperature is maintained at 40-50°C, and ethylene glycol dimethacrylate is added and stirred to obtain a crosslinking agent mixed system solution. The system is then heated to 65-75°C while stirring, and ammonium persulfate is added in three portions, with an interval of 10 minutes between each addition. The reaction is maintained at this temperature for 2-3 hours after the addition is completed to obtain a mixed solution. The system temperature is then lowered to 40-50°C, and ammonium sulfate is added again and stirred to obtain a uniform viscous liquid. Finally, the system is allowed to cool naturally to room temperature, and the product is filtered through a 100-mesh filter to obtain a high-temperature resistant and wind-erosion resistant composite dust suppressant material.

[0035] Example 1 (1) Add 200g of purified water to a four-necked flask, and slowly add 0.15g of sodium dodecyl sulfate while stirring. Stir for 15 minutes until completely dissolved to form a uniform surfactant solution. (2) Under continuous stirring, 0.03 g of trimethylolpropane (oxypropylene) triether was slowly added to the flask, the temperature was raised to 40°C, and the mixture was stirred for 30 min until the polyether was completely dissolved and the solution was transparent; then 1 g of N-(3-hydroxypropyl)acrylamide was added and the mixture was stirred for 20 min to ensure that the monomer was evenly dispersed. (3) Maintain the temperature at 40℃ and add 0.4g of ethylene glycol dimethacrylate dropwise to the flask. After the addition is complete, continue stirring for 10min to ensure the crosslinking agent is fully mixed with the system. Raise the temperature of the system to 65℃ and add 0.1g of ammonium persulfate in three portions, 10min apart, while stirring. After the addition is complete, maintain the temperature at 65℃ and stir for 2-3 hours. After the reaction is complete, lower the temperature of the system to 40℃, add 0.02g of ammonium sulfate, and stir for 15min until completely dissolved. At this point, the system is a homogeneous viscous liquid. (4) Turn off the heating and stop stirring, and let the system cool naturally to room temperature; filter the product with a 100-mesh filter to remove any possible small amount of unreacted particles or gel blocks, and finally obtain a high-temperature resistant and wind-erosion resistant composite dust suppressant material.

[0036] Example 2 (1) Add 200g of purified water to a four-necked flask, and slowly add 0.15g of sodium dodecyl sulfate while stirring. Stir for 17 minutes until completely dissolved to form a uniform surfactant solution. (2) Under continuous stirring, 0.03 g of trimethylolpropane (oxypropylene) triether was slowly added to the flask, the temperature was raised to 45°C, and the mixture was stirred for 35 min until the polyether was completely dissolved and the solution was transparent; then 1.5 g of N-(3-hydroxypropyl)acrylamide was added and the mixture was stirred for another 25 min to ensure that the monomer was evenly dispersed. (3) Maintaining the temperature at 45°C, add 0.5g of ethylene glycol dimethacrylate dropwise to the flask. After the addition is complete, continue stirring for 12 minutes to ensure the crosslinking agent is fully mixed with the system. Raise the temperature of the system to 70°C, and add 0.2g of ammonium persulfate in three portions, 10 minutes apart, while stirring. After the addition is complete, maintain the temperature at 70°C and stir for 2.5 hours. After the reaction is complete, lower the temperature of the system to 45°C, add 0.02g of ammonium sulfate, and stir for 18 minutes until completely dissolved. At this point, the system is a homogeneous viscous liquid. (4) Turn off the heating and stop stirring, and let the system cool naturally to room temperature; filter the product with a 100-mesh filter to remove any possible small amount of unreacted particles or gel blocks, and finally obtain a high-temperature resistant and wind-erosion resistant composite dust suppressant material.

[0037] Example 3 (1) Add 200g of purified water to a four-necked flask, and slowly add 0.15g of sodium dodecyl sulfate while stirring. Stir for 20 minutes until completely dissolved to form a uniform surfactant solution. (2) Under continuous stirring, 0.03 g of trimethylolpropane (oxypropylene) triether was slowly added to the flask, the temperature was raised to 50°C, and the mixture was stirred for 40 min until the polyether was completely dissolved and the solution was transparent; then 2.0 g of N-(3-hydroxypropyl)acrylamide was added and the mixture was stirred for another 30 min to ensure that the monomer was evenly dispersed. (3) Maintaining the temperature at 50°C, add 0.6 g of ethylene glycol dimethacrylate dropwise to the flask. After the addition is complete, continue stirring for 15 min to ensure the crosslinking agent is fully mixed with the system. Raise the temperature of the system to 75°C, and add 0.3 g of ammonium persulfate in three portions with 10 min intervals each, while stirring. After the addition is complete, maintain the temperature at 75°C and stir for 3 hours. After the reaction is complete, lower the temperature of the system to 50°C, add 0.02 g of ammonium sulfate, and stir for 20 min until completely dissolved. At this point, the system is a homogeneous viscous liquid. (4) Turn off the heating and stop stirring, and let the system cool naturally to room temperature; filter the product with a 100-mesh filter to remove any possible small amount of unreacted particles or gel blocks, and finally obtain a high-temperature resistant and wind-erosion resistant composite dust suppressant material.

[0038] Example 4 (1) Add 200g of purified water to a four-necked flask, and slowly add 0.15g of sodium dodecyl sulfate while stirring. Stir for 15 minutes until completely dissolved to form a uniform surfactant solution. (2) Under continuous stirring, 0.04 g of trimethylolpropane (oxypropylene) triether was slowly added to the flask, the temperature was raised to 40°C, and the mixture was stirred for 30 min until the polyether was completely dissolved and the solution was transparent; then 1.0 g of N-(3-hydroxypropyl)acrylamide was added and the mixture was stirred for 20 min to ensure that the monomer was evenly dispersed. (3) Maintaining the temperature at 40°C, add 0.5 g of ethylene glycol dimethacrylate dropwise to the flask. After the addition is complete, continue stirring for 10 min to ensure the crosslinking agent is fully mixed with the system. Raise the temperature of the system to 65°C, and add 0.4 g of ammonium persulfate in three portions, 10 min apart, while stirring. After the addition is complete, maintain the temperature at 65°C and stir for 2 hours. After the reaction is complete, lower the temperature of the system to 40°C, add 0.02 g of ammonium sulfate, and stir for 15 min until completely dissolved. At this point, the system is a homogeneous viscous liquid. (4) Turn off the heating and stop stirring, and let the system cool naturally to room temperature; filter the product with a 100-mesh filter to remove any possible small amount of unreacted particles or gel blocks, and finally obtain a high-temperature resistant and wind-erosion resistant composite dust suppressant material.

[0039] Example 5 (1) Add 200g of purified water to a four-necked flask, and slowly add 0.15g of sodium dodecyl sulfate while stirring. Stir for 18 minutes until completely dissolved to form a uniform surfactant solution. (2) Under continuous stirring, 0.04 g of trimethylolpropane (oxypropylene) triether was slowly added to the flask, the temperature was raised to 45°C, and the mixture was stirred for 35 min until the polyether was completely dissolved and the solution was transparent; then 1.5 g of N-(3-hydroxypropyl)acrylamide was added and the mixture was stirred for another 35 min to ensure that the monomer was evenly dispersed. (3) Maintaining the temperature at 45°C, add 0.6 g of ethylene glycol dimethacrylate dropwise to the flask. After the addition is complete, continue stirring for 13 min to ensure the crosslinking agent is fully mixed with the system. Raise the temperature of the system to 70°C, and add 0.2 g of ammonium persulfate in three portions, 10 min apart, while stirring. After the addition is complete, maintain the temperature at 70°C and stir for 2.5 hours. After the reaction is complete, lower the temperature of the system to 45°C, add 0.02 g of ammonium sulfate, and stir for 17 min until completely dissolved. At this point, the system is a homogeneous viscous liquid. (4) Turn off the heating and stop stirring, and let the system cool naturally to room temperature; filter the product with a 100-mesh filter to remove any possible small amount of unreacted particles or gel blocks, and finally obtain a high-temperature resistant and wind-erosion resistant composite dust suppressant material.

[0040] Example 6 (1) Add 200g of purified water to a four-necked flask, and slowly add 0.15g of sodium dodecyl sulfate while stirring. Stir for 20 minutes until completely dissolved to form a uniform surfactant solution. (2) Under continuous stirring, 0.04 g of trimethylolpropane (oxypropylene) triether was slowly added to the flask, the temperature was raised to 50°C, and the mixture was stirred for 40 min until the polyether was completely dissolved and the solution was transparent; then 2.0 g of N-(3-hydroxypropyl)acrylamide was added and the mixture was stirred for another 30 min to ensure that the monomer was evenly dispersed. (3) Maintaining the temperature at 50°C, add 0.4 g of ethylene glycol dimethacrylate dropwise to the flask. After the addition is complete, continue stirring for 15 min to ensure the crosslinking agent is fully mixed with the system. Raise the temperature of the system to 75°C, and add 0.3 g of ammonium persulfate in three portions, 10 min apart, while stirring. After the addition is complete, maintain the temperature at 75°C and stir for 3 hours. After the reaction is complete, lower the temperature of the system to 50°C, add 0.02 g of ammonium sulfate, and stir for 20 min until completely dissolved. At this point, the system is a homogeneous viscous liquid. (4) Turn off the heating and stop stirring, and let the system cool naturally to room temperature; filter the product with a 100-mesh filter to remove any possible small amount of unreacted particles or gel blocks, and finally obtain a high-temperature resistant and wind-erosion resistant composite dust suppressant material.

[0041] Example 7 (1) Add 200g of purified water to a four-necked flask, and slowly add 0.15g of sodium dodecyl sulfate while stirring. Stir for 15 minutes until completely dissolved to form a uniform surfactant solution. (2) Under continuous stirring, 0.05 g of trimethylolpropane (oxypropylene) triether was slowly added to the flask, the temperature was raised to 40°C, and the mixture was stirred for 30 min until the polyether was completely dissolved and the solution was transparent; then 1.0 g of N-(3-hydroxypropyl)acrylamide was added and the mixture was stirred for 20 min to ensure that the monomer was evenly dispersed. (3) Maintaining the temperature at 40°C, add 0.6 g of ethylene glycol dimethacrylate dropwise to the flask. After the addition is complete, continue stirring for 10 min to ensure the crosslinking agent is fully mixed with the system. Raise the temperature of the system to 65°C, and add 0.3 g of ammonium persulfate in three portions, 10 min apart, while stirring. After the addition is complete, maintain the temperature at 65°C and stir for 2 hours. After the reaction is complete, lower the temperature of the system to 40°C, add 0.02 g of ammonium sulfate, and stir for 15 min until completely dissolved. At this point, the system is a homogeneous viscous liquid. (4) Turn off the heating and stop stirring, and let the system cool naturally to room temperature; filter the product with a 100-mesh filter to remove any possible small amount of unreacted particles or gel blocks, and finally obtain a high-temperature resistant and wind-erosion resistant composite dust suppressant material.

[0042] Example 8 (1) Add 200g of purified water to a four-necked flask, and slowly add 0.15g of sodium dodecyl sulfate while stirring. Stir for 15 minutes until completely dissolved to form a uniform surfactant solution. (2) Under continuous stirring, 0.05 g of trimethylolpropane (oxypropylene) triether was slowly added to the flask, the temperature was raised to 45°C, and the mixture was stirred for 35 min until the polyether was completely dissolved and the solution was transparent; then 1.5 g of N-(3-hydroxypropyl)acrylamide was added and the mixture was stirred for another 25 min to ensure that the monomer was evenly dispersed. (3) Maintaining the temperature at 45°C, add 0.5g of ethylene glycol dimethacrylate dropwise to the flask. After the addition is complete, continue stirring for 15 minutes to ensure the crosslinking agent is fully mixed with the system. Raise the temperature of the system to 70°C, and add 0.2g of ammonium persulfate in three portions, 10 minutes apart, while stirring. After the addition is complete, maintain the temperature at 70°C and stir for 2.5 hours. After the reaction is complete, lower the temperature of the system to 45°C, add 0.02g of ammonium sulfate, and stir for 20 minutes until completely dissolved. At this point, the system is a homogeneous viscous liquid. (4) Turn off the heating and stop stirring, and let the system cool naturally to room temperature; filter the product with a 100-mesh filter to remove any possible small amount of unreacted particles or gel blocks, and finally obtain a high-temperature resistant and wind-erosion resistant composite dust suppressant material.

[0043] Example 9 (1) Add 200g of purified water to a four-necked flask, and slowly add 0.15g of sodium dodecyl sulfate while stirring. Stir for 15 minutes until completely dissolved to form a uniform surfactant solution. (2) Under continuous stirring, 0.05 g of trimethylolpropane (oxypropylene) triether was slowly added to the flask, the temperature was raised to 50°C, and the mixture was stirred for 40 min until the polyether was completely dissolved and the solution was transparent; then 2.0 g of N-(3-hydroxypropyl)acrylamide was added and the mixture was stirred for another 30 min to ensure that the monomer was evenly dispersed. (3) Maintaining the temperature at 50°C, add 0.5 g of ethylene glycol dimethacrylate dropwise to the flask. After the addition is complete, continue stirring for 15 min to ensure the crosslinking agent is fully mixed with the system. Raise the temperature of the system to 75°C, and add 0.2 g of ammonium persulfate in three portions, 10 min apart, while stirring. After the addition is complete, maintain the temperature at 75°C and stir for 3 hours. After the reaction is complete, lower the temperature of the system to 50°C, add 0.02 g of ammonium sulfate, and stir for 20 min until completely dissolved. At this point, the system is a homogeneous viscous liquid. (4) Turn off the heating and stop stirring, and let the system cool naturally to room temperature; filter the product with a 100-mesh filter to remove any possible small amount of unreacted particles or gel blocks, and finally obtain a high-temperature resistant and wind-erosion resistant composite dust suppressant material.

[0044] Comparative Example 1 (1) Add 200g of purified water to a four-necked flask, and slowly add 0.15g of sodium dodecyl sulfate while stirring. Stir for 15 minutes until completely dissolved to form a uniform surfactant solution. (2) While stirring continuously, slowly add 0.05 g of sucrose polyether to the flask, heat to 45°C, then add 2.0 g of N-(3-hydroxypropyl)acrylamide, and continue stirring for 25 min to ensure uniform dispersion of the monomer; (3) Maintaining the temperature at 45°C, add 0.5g of ethylene glycol dimethacrylate dropwise to the flask. After the addition is complete, continue stirring for 15 minutes to ensure the crosslinking agent is fully mixed with the system. Raise the temperature of the system to 70°C, and add 0.2g of ammonium persulfate in three portions, 10 minutes apart, while stirring. After the addition is complete, maintain the temperature at 70°C and stir for 2.5 hours. After the reaction is complete, lower the temperature of the system to 45°C, add 0.02g of ammonium sulfate, and stir for 20 minutes until completely dissolved. At this point, the system is a homogeneous viscous liquid. (4) Turn off the heating and stop stirring, and let the system cool naturally to room temperature; filter the product with a 100-mesh filter to remove any possible small amount of unreacted particles or gel blocks, and finally obtain the dust suppressant material of Comparative Example 1.

[0045] The difference from the examples is that Comparative Example 1 uses sucrose polyether instead of trimethylolpropane (oxypropylene) triether. The sucrose polyether has the CAS number 26873-85-8-1-7 and was purchased from Shanghai Qinsheng Biotechnology Co., Ltd., with product number QSRF1114.

[0046] Comparative Example 2 (1) Add 200g of purified water to a four-necked flask, and slowly add 0.15g of sodium dodecyl sulfate while stirring. Stir for 15 minutes until completely dissolved to form a uniform surfactant solution. (2) While stirring continuously, slowly add 0.05 g of trimethylolpropane (oxypropylene) triether to the flask, heat to 45°C, then add 2.0 g of acrylamide, and continue stirring for 25 min to ensure uniform dispersion of the monomer. (3) Maintaining the temperature at 45°C, add 0.5g of ethylene glycol dimethacrylate dropwise to the flask. After the addition is complete, continue stirring for 15 minutes to ensure the crosslinking agent is fully mixed with the system. Raise the temperature of the system to 70°C, and add 0.2g of ammonium persulfate in three portions, 10 minutes apart, while stirring. After the addition is complete, maintain the temperature at 70°C and stir for 2.5 hours. After the reaction is complete, lower the temperature of the system to 45°C, add 0.02g of ammonium sulfate, and stir for 20 minutes until completely dissolved. At this point, the system is a homogeneous viscous liquid. (4) Turn off the heating and stop stirring, and let the system cool naturally to room temperature; filter the product with a 100-mesh filter to remove any possible small amount of unreacted particles or gel blocks, and finally obtain the dust suppressant material of Comparative Example 2.

[0047] The difference from the examples is that Comparative Example 2 uses acrylamide instead of N-(3-hydroxypropyl)acrylamide. The acrylamide used has the CAS number 79-06-1-6-8 and was purchased from Beijing Innocare Technology Co., Ltd., product number A108470-500g.

[0048] Comparative Example 3 (1) Add 200g of purified water to a four-necked flask, and slowly add 0.15g of sodium dodecyl sulfate while stirring. Stir for 15 minutes until completely dissolved to form a uniform surfactant solution. (2) Under continuous stirring, 0.05 g of trimethylolpropane (oxypropylene) triether was slowly added to the flask, the temperature was raised to 45°C, and the mixture was stirred for 35 min until the polyether trimethylolpropane (oxypropylene) triether was completely dissolved and the solution was transparent; then 2.0 g of N-(3-hydroxypropyl)acrylamide was added and the mixture was stirred for another 25 min to ensure that the monomer was evenly dispersed. (3) Maintaining the temperature at 45℃, add 0.5g of polyethylene glycol diacrylate dropwise to the flask. After the addition is complete, continue stirring for 10min to ensure the crosslinking agent is fully mixed with the system. Raise the temperature of the system to 70℃, and add 0.2g of ammonium persulfate in three portions, 10min apart, while stirring. After the addition is complete, maintain the temperature at 70℃ and stir for 2.5 hours. After the reaction is complete, lower the temperature of the system to 45℃, add 0.02g of ammonium sulfate, and stir for 20min until completely dissolved. At this point, the system is a homogeneous viscous liquid. (4) Turn off the heating and stop stirring, and let the system cool naturally to room temperature; filter the product with a 100-mesh filter to remove any possible small amount of unreacted particles or gel blocks, and finally obtain the dust suppressant material of Comparative Example 3.

[0049] The difference from the examples is that in Comparative Example 3, polyethylene glycol diacrylate was used instead of ethylene glycol dimethacrylate. The CAS number of the polyethylene glycol diacrylate was 26570-48-9-3-9; it was purchased from Pusitang, catalog number P50010-500ml.

[0050] Comparative Example 4 (1) Add 200g of purified water to a four-necked flask, and slowly add 0.15g of sodium dodecyl sulfate while stirring. Stir for 15 minutes until completely dissolved to form a uniform surfactant solution. (2) While stirring continuously, slowly add 0.05g of polyvinyl alcohol to the flask, heat to 45°C, and stir for 35min until the polyol is completely dissolved and the solution is transparent; then add 2.0g of N-(3-hydroxypropyl)acrylamide and continue stirring for 25min to ensure that the monomer is evenly dispersed. (3) Maintaining the temperature at 45°C, add 0.5g of ethylene glycol dimethacrylate dropwise to the flask. After the addition is complete, continue stirring for 15 minutes to ensure the crosslinking agent is fully mixed with the system. Raise the temperature of the system to 70°C, and add 0.2g of ammonium persulfate in three portions, 10 minutes apart, while stirring. After the addition is complete, maintain the temperature at 70°C and stir for 2.5 hours. After the reaction is complete, lower the temperature of the system to 45°C, add 0.02g of ammonium sulfate, and stir for 15 minutes until completely dissolved. At this point, the system is a homogeneous viscous liquid. (4) Turn off the heating and stop stirring, and let the system cool naturally to room temperature; filter the product with a 100-mesh filter to remove any possible small amount of unreacted particles or gel blocks, and finally obtain the dust suppressant material of Comparative Example 4.

[0051] The difference from the examples is that Comparative Example 4 uses polyvinyl alcohol instead of trimethylolpropane (oxypropylene) triether. The polyvinyl alcohol used has the CAS number 9002-89-5-4-10 and was purchased from Shanghai Bosheng Biotechnology Co., Ltd., type 117 / catalog number BES210438D.

[0052] Test case (a) Wind erosion resistance test The dust suppressant materials prepared in Examples 1-9 and Comparative Examples 1-4 were subjected to mass loss rate tests to detect their wind erosion resistance.

[0053] The sieved coal powder was placed in an oven and dried at 80℃ for 2 hours. 5g of the dried coal powder was then evenly spread in a petri dish of the same size. 10g of the dust suppressant materials prepared in Examples 1-9 and Comparative Examples 1-4 were sprayed onto the surface of the coal powder. A dust suppression simulation study was conducted indoors using a fan with a wind speed of 12.8 m / s, simulating a wind erosion environment for 100 minutes. Mass loss was measured every 20 minutes, and the mass measurement value at the 100th minute was used to calculate the wind erosion rate as the wind erosion rate for that experimental group, thus testing its wind erosion resistance. The mass loss rate of the samples was calculated. The obtained experimental results were used to calculate the mass loss rate using the following formula: (1.1); In equation (1.1): m is the mass loss rate, i.e., wind erosion rate / %; W is the weight of the sample before wind erosion / g; and w is the weight of the sample after wind erosion / g. The test results are shown in the table below: Table 2 Wind Erosion Resistance Test

[0054] As can be clearly seen from the test results in Table 2, the wind erosion resistance of the coal seams in the examples is significantly higher than that in the comparative examples, and the average wind erosion rate after spraying by the examples is less than 10.19%, with Example 8 having the lowest average wind erosion rate at 5.21%. Meanwhile, from... Figure 2 It can be clearly seen that the wind erosion resistance of the coal seam in the embodiment is consistently higher than that in the comparative example under 100 minutes of wind erosion environment, indicating that the dust suppressant material prepared by the present invention still has good wind erosion resistance under continuous wind erosion conditions. The dust suppressant can play a good role in wetting and agglomerating dust, effectively improving the dust reduction efficiency of hydrophobic coal dust.

[0055] The erosion rate of Example 8 (best example) was compared with that of Comparative Examples 1-4 using a t-test to determine whether there was a statistically significant difference between the two.

[0056] Data compilation: Example 8 (Best Example): Average wind erosion rate: 5.21%; Wind erosion rate data: 5.01, 5.29, 5.33, 5.11, 5.63, 4.99, 5.14, 5.20; Sample size: n1=8; Standard deviation: s1=0.2072; Comparative Example 1: Average wind erosion rate: 17.54%; Wind erosion rate data: 17.68, 16.11, 17.56, 16.55, 18.32, 18.91, 17.29, 17.90; Sample size: n²=8; Standard deviation: s²=0.9042; Comparative Example 2: Average wind erosion rate: 28.16%; Wind erosion rate data: 29.25, 26.71, 27.25, 29.20, 26.42, 29.25, 28.54, 28.66; Sample size: n²=8; Standard deviation: s²=1.1838; Comparative Example 3: Average wind erosion rate: 22.73%; Wind erosion rate data: 22.11, 23.79, 21.78, 22.54, 23.26, 22.49, 24.11, 21.77; Sample size: n²=8; Standard deviation: s²=0.8953; Comparative Example 4: Average wind erosion rate: 19.59%; Wind erosion rate data: 18.74, 20.00, 19.04, 20.37, 18.39, 20.16, 19.47, 20.55; Sample size: n²=8; Standard deviation: s²=0.8020.

[0057] t-test results: t-test formula: t=(x1-x2) / ; 1. Example 8 and Comparative Example 1: t=(5.21-17.54) / =-37.59, p-value < 0.001 (two-tailed test); 2. Example 8 and Comparative Example 2: t=(5.21-28.16) / =-53.99, p-value<0.001 (two-tailed test); 3. Example 8 and Comparative Example 3: t=(5.21-22.73) / =-53.91, p-value <0.001 (two-tailed test); 4. Example 8 and Comparative Example 4: t=(5.21-19.59) / =-49.08, p-value <0.001 (two-tailed test).

[0058] The average wind erosion rate of Example 8 (5.21%) was significantly lower than that of all comparative examples (Comparative Example 1: 17.54%, Comparative Example 2: 28.16%, Comparative Example 3: 22.73%, Comparative Example 4: 19.59%). From a practical application perspective, the average wind erosion rate of Example 8 (5.21%) was about 70% lower than that of Comparative Example 1 (17.54%) and about 81% lower than that of Comparative Example 2 (28.16%), indicating that the dust suppression material of the present invention can effectively maintain a longer dust suppression time under wind erosion conditions. Moreover, the p-values ​​of all t-test results were all much less than 0.001 (p<0.001), indicating that the difference in wind erosion rate between Example 8 and all comparative examples was statistically significant. This significant difference confirms that the high-temperature resistant and wind-erosion-resistant composite dust suppressant material prepared in this invention (Example 8) is indeed superior to the dust suppressant materials of Comparative Examples 1-4 in terms of wind erosion resistance.

[0059] (ii) High temperature resistance test After spraying the dust suppressant solutions prepared in Example 8 and Comparative Examples 1-4 onto coal dust for 2 hours, the dust suppressant solidified. A 5cm side length of the solidified dust suppressant was taken for film formation and sliced. The slices were placed in a forced-air drying oven, and the oven temperature was set to 30, 40, 50, 60, 70, 80, 90, and 100°C for high-temperature drying for 3 hours. The slices were then removed and observed with a magnifying glass for the presence of fine cracks. If the slices were intact and had fewer than 5 fine cracks on the surface, the film formation was considered good. This process was repeated 30 times, and the film formation rate was calculated for each temperature. The film formation rate (%) = (number of qualified slices meeting the "good film formation" standard / total number of test groups) × 100%. The results are as follows: Figure 3 As shown.

[0060] Depend on Figure 3 The test results clearly show that although the film-forming rate of the dust suppressant in the examples decreased with increasing temperature, the film-forming rate remained above 91%, and was still as high as 91.31% at 100℃. Moreover, the film-forming rate of Example 8 was significantly greater than that of the comparative example at all temperatures. This indicates that the dust suppressant prepared by the present invention still has good film-forming properties at high temperatures, that is, it has extremely strong high-temperature resistance and can stably and persistently encapsulate dust particles in harsh high-temperature environments, resist environmental damage, and achieve efficient and long-lasting dust suppression.

[0061] (III) Performance comparison test with typical dust suppressants in existing technologies Test subjects: Four types of typical and widely used coal mine dust suppressants in the prior art were selected as comparative samples. The test methods (wind erosion resistance and high temperature resistance) of the above test examples (I) and (II) were used to keep the test conditions consistent. Through parallel tests and statistical analysis, the superior performance of the best formulation example 8 of the present invention was verified.

[0062] Preparation of experimental materials: 1. Experimental group Sample: High-temperature resistant and wind-erosion resistant composite coal mine dust suppressant prepared in Example 8 of this invention. Key parameters: The solid content is consistent with the existing technology comparison sample (calculated as 3.2%) to ensure fairness in the comparison.

[0063] 2. Typical dust suppressants in existing technologies Four categories of mainstream industrial-grade products were selected, covering different technological approaches: Table 3. Details of Typical Dust Suppressants in Existing Technologies

[0064] Among them, Comparative Sample 1 is the most widely used polymeric dust suppressant in the existing technology, which relies on polyvinyl alcohol to form a film. It is low in cost but has poor high temperature resistance. Comparative Sample 2 is a low-cost mineral-based dust suppressant that fixes dust through physical adsorption and has weak wind erosion resistance. Comparative Sample 3 is a traditional "wetting type" dust suppressant that only wets the dust by reducing surface tension and has no film-forming and fixing effect. Comparative Sample 4 is an advanced product of existing coal mine-specific composite dust suppressant labeled "high temperature resistance and wind erosion resistance".

[0065] Test method: 1. Wind erosion resistance test Sample pretreatment: After sieving, the coal powder was dried at 80℃ for 2 hours, and 5g was evenly spread on a petri dish. Dust suppressant spraying: 10g of the prepared dust suppressant was sprayed on each group (experimental group + 4 control samples); Wind erosion simulation: wind speed 12.8 m / s, lasting 100 minutes, mass loss measured every 20 minutes; Parallel tests: Perform 8 parallel tests for each group [consistent with the above test example (I)], and calculate the average wind erosion rate and standard deviation; Statistical analysis: Independent samples t-test was used to analyze the significance of wind erosion rates between the experimental group and each control sample (α=0.05).

[0066] Test results and analysis of wind erosion resistance performance: Table 4 Results of wind erosion resistance

[0067] Results Analysis: The wind erosion rate of Example 8 was significantly lower than that of all typical dust suppressants in the prior art. The core reason is that the synergistic structure of the "three-dimensional network and hydrogen bond synergy" of the present invention can firmly encapsulate dust and resist wind shear; while in the prior art, PVA type is easy to soften at high temperature, bentonite-based has low bonding strength, surfactant type has no film-forming ability, and commercially available composite type lacks efficient cross-linking and hydrogen bond strengthening mechanism.

[0068] 2. High Temperature Resistance Test Sample preparation: After the dust suppressant was sprayed and solidified for 2 hours, a slice of the solidified material with a side length of 5cm was taken. High-temperature treatment: Dry in a forced-air drying oven at 30℃, 50℃, 70℃, 90℃, and 100℃ for 3 hours respectively; Film formation evaluation criteria: If the slice is free of breakage and has fewer than 5 minor surface cracks, it is judged as "good film formation"; Parallel tests: 30 parallel tests were performed for each group, and the film formation rate was calculated [consistent with the above test example (II)]; Results analysis: Compare the differences in film formation rate between the experimental group and each control sample at different temperatures.

[0069] High-temperature resistance test results and analysis: Table 5 High Temperature Resistance Results

[0070] Results Analysis: Under extreme temperatures, the film-forming rate of Example 8 remained above 91%, far exceeding that of existing technologies. This is attributed to the excellent high and low temperature resistance of the trimethylolpropane (oxypropylene) triether used in this invention, and the hydrogen bonds formed with the polymer can absorb heat and inhibit molecular chain movement. Existing dust suppressants lack this synergistic mechanism, resulting in a sharp decline in film-forming performance at high temperatures. Among existing commercially available products, for example, the PVA molecular chains in Comparative Sample 1 (PVA type) break at high temperatures, resulting in a brittle film despite its formation; the inorganic minerals in Comparative Sample 2 (bentonite-based) dehydrate at high temperatures, leading to a loose structure; Comparative Sample 3 (surfactant type) contains almost no film-forming components, relying solely on physical adsorption, resulting in rapid water evaporation at high temperatures; and Comparative Sample 4 (commercially available composite type) has insufficient crosslinking density, causing the network structure to collapse easily at high temperatures, ultimately leading to insufficient dust suppression effect.

[0071] In summary, the dust suppressant material prepared by this invention can effectively resist wind erosion, withstand high temperatures, and form films efficiently, thus having broad market prospects.

[0072] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the present invention. Of course, the present invention is not limited to the above examples. Those skilled in the art can still modify or replace the foregoing technical solutions, and such modifications or replacements do not cause the essence of the present invention to deviate from the scope of the technical solutions of the various embodiments, and are also within the scope of protection.

Claims

1. A high-temperature resistant and wind-erosion resistant composite dust suppressant material for coal mines, characterized in that, It includes the following raw materials: trimethylolpropane (oxypropylene) triether, N-(3-hydroxypropyl)acrylamide, ethylene glycol dimethacrylate, surfactant, initiator, humectant and water.

2. The high-temperature resistant and wind-erosion-resistant composite coal mine dust suppressant material as described in claim 1, characterized in that, The raw materials include the following parts by weight: 0.03-0.07 parts trimethylolpropane (oxypropylene) triether, 1-2 parts N-(3-hydroxypropyl)acrylamide, 0.2-0.6 parts ethylene glycol dimethacrylate, 0.1-0.2 parts surfactant, 0.1-0.4 parts initiator, 0.01-0.03 parts humectant, and 200-220 parts water.

3. The high-temperature resistant and wind-erosion-resistant composite coal mine dust suppressant material as described in claim 2, characterized in that, The ingredients include the following parts by weight: 0.05 parts trimethylolpropane (oxypropylene) triether, 1.5 parts N-(3-hydroxypropyl)acrylamide, 0.5 parts ethylene glycol dimethacrylate, 0.15 parts surfactant, 0.2 parts initiator, 0.02 parts humectant, and 200 parts water.

4. The high-temperature resistant and wind-erosion-resistant composite coal mine dust suppressant material as described in claim 1, characterized in that, The surfactant is sodium dodecyl sulfate.

5. The high-temperature resistant and wind-erosion-resistant composite coal mine dust suppressant material as described in claim 1, characterized in that, The initiator is ammonium persulfate.

6. The high-temperature resistant and wind-erosion-resistant composite coal mine dust suppressant material as described in claim 1, characterized in that, The humectant is ammonium sulfate; the water is purified water.

7. The preparation method of the high-temperature resistant and wind-erosion-resistant composite coal mine dust suppressant material according to any one of claims 1-6, characterized in that, Includes the following steps: (1) Mix the surfactant and water to form a surfactant solution; (2) Under continuous stirring, add trimethylolpropane (oxypropylene) triether to the surfactant solution obtained in step (1), heat to 40-50℃ until the solution becomes transparent; then add N-(3-hydroxypropyl)acrylamide and continue stirring to ensure that the monomer is uniformly dispersed. (3) Keep the temperature at 40-50℃ and continue to add ethylene glycol dimethacrylate dropwise to step (2), and continue stirring to fully mix ethylene glycol dimethacrylate with the system; then raise the temperature of the system to 65-75℃ and add the initiator while stirring. After the initiator is added, keep the temperature and continue the reaction; after the reaction is completed, lower the temperature of the system to 40-50℃, add the humectant, and stir until completely dissolved to obtain a uniform viscous liquid; (4) Turn off the heating, stop stirring, let the system cool naturally to room temperature, filter, and obtain high temperature resistant and wind erosion resistant composite coal mine dust suppressant material.

8. The preparation method of the high-temperature resistant and wind-erosion resistant composite coal mine dust suppressant material as described in claim 7, characterized in that, It also includes the following steps: Place trimethylolpropane (oxypropylene) triether in a vacuum drying oven at 60-70℃ and dry for 2-3 hours to remove moisture.

9. The preparation method of the high-temperature resistant and wind-erosion resistant composite coal mine dust suppressant material as described in claim 7, characterized in that, In step (4), the product is filtered using a 100-mesh filter to remove unreacted particles or gel blocks.

10. The preparation method of the high-temperature resistant and wind-erosion-resistant composite coal mine dust suppressant material as described in claim 7, characterized in that, Includes the following steps: (1) Mix the surfactant and water and stir for 15-20 minutes until completely dissolved to form a surfactant solution; place the trimethylolpropane (oxypropylene) triether in a vacuum drying oven at 60-70℃ and dry for 2-3 hours; (2) Under continuous stirring, add the dried trimethylolpropane (oxypropylene) triether to the surfactant solution obtained in step (1), heat to 40-50℃, and stir for 30-40 min until the trimethylolpropane (oxypropylene) triether dissolves and the solution becomes transparent; then add N-(3-hydroxypropyl)acrylamide and continue stirring for 20-30 min to ensure uniform dispersion of the monomer; (3) Keep the temperature at 40-50℃ and continue to add ethylene glycol dimethacrylate dropwise to step (2), and continue stirring for 10-15 min to fully mix ethylene glycol dimethacrylate with the system; then raise the temperature of the system to 65-75℃ and add the initiator in 3 portions with a 10 min interval between each addition while stirring. After the addition is complete, keep the temperature and continue the reaction for 2-3 h; after the reaction is complete, lower the temperature of the system to 40-50℃, add the humectant, and stir for 15-20 min until completely dissolved to obtain a uniform viscous liquid; (4) Turn off the heating and stop stirring. Let the system cool naturally to room temperature. Filter the product with a 100-mesh filter to obtain a high-temperature resistant and wind-erosion resistant composite coal mine dust suppressant material.

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