A dust suppressant for coal transportation and method of use thereof

Abstract

The application discloses a coal transportation dust suppressant and a use method thereof, and relates to the technical field of environmental management materials. The coal transportation dust suppressant comprises the following raw materials in parts by weight: 8-12 parts of sodium carboxymethyl cellulose, 6-10 parts of a film forming agent, 1.5-2.5 parts of a thickening agent, 1-2 parts of a wetting agent, 0.5-1 part of a humectant, 0.2-0.4 parts of a bacteriostatic agent, 0.5-0.8 parts of an inhibitor and 100 parts of deionized water. The intermediate 1 is generated by the reaction of 9-octadecene amine and glycidol, the intermediate 2 is generated by the reaction of the intermediate 1 and 1,4-bis(bromomethyl)benzene, and the wetting agent is generated by the reaction of the intermediate 2 and mercaptohexaethylene glycol hydroxyl. The coal transportation dust suppressant prepared by the application has excellent wetting performance and bacteriostatic performance.

Description

Technical Field

[0001] This invention relates to the field of environmental governance materials technology, specifically to a dust suppressant for coal transportation and its application method. Background Technology

[0002] Coal, as a crucial basic energy source in my country, inevitably generates large amounts of coal dust during mining, storage, and transportation. Especially in railway, highway, and belt conveyor transport, the fine, hydrophobic particles on the coal surface are easily stirred up by wind and mechanical vibration, causing not only coal resource losses but also severe environmental pollution, adversely affecting the health of workers and the ecological safety of the transport route. Therefore, developing safe, environmentally friendly, and effective dust suppressants for coal transportation is of great significance. Existing coal dust suppression technologies mainly include water spraying, inorganic salt dust suppression, and polymer film-forming dust suppression. Water spraying requires frequent spraying due to rapid water evaporation and poor coal dust wettability, making it unsuitable for long-distance transportation. Inorganic salt dust suppressants, while possessing some hygroscopic properties, easily cause equipment corrosion, adversely affecting the service life of transport vehicles and facilities. Some polymer film-forming dust suppressants have good film-forming properties, but their ability to wet the coal dust surface is insufficient, making rapid penetration and uniform coverage difficult, thus affecting dust suppression efficiency. Furthermore, coal is exposed to a humid environment for extended periods, making the organic components in dust suppressants a nutrient source for microbial growth. Most existing dust suppressants do not adequately consider antibacterial properties, leading to deterioration, off-odors, or performance degradation during storage or use, thus affecting the stability of dust suppression effects and safety. Therefore, developing a dust suppressant for coal transportation that combines good wetting and antibacterial properties is of great significance.

[0003] Chinese invention patent CN114350319A discloses a dust suppressant for railway coal transportation and its preparation method. The dust suppressant comprises the following components in parts by weight: 0.3-1.0 parts of a binder / film-forming agent, 0.1-0.8 parts of a thickener, 0.1-0.5 parts of a wetting agent, 0.2-0.4 parts of a corrosion inhibitor, 0.1-0.3 parts of a bactericide, 0-0.1 parts of a defoamer, and 96.9-99.2 parts of water. This dust suppressant for railway coal transportation is chlorine-free, exhibits good water solubility, stability, and binder / film-forming properties, and possesses functions such as hygroscopicity, wetting, corrosion inhibition, and binder / film formation. It has no impact on construction equipment or coal quality. After spraying onto the surface of railway coal, it forms a solidified layer with a certain thickness, toughness, and rain resistance, effectively solving environmental pollution and losses during railway coal transportation. However, its antibacterial performance is still insufficient, and its dust suppression durability needs further improvement. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the purpose of this invention is to provide a dust suppressant for coal transportation and its application method.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A dust suppressant for coal transportation, comprising the following raw materials in parts by weight: 8-12 parts sodium carboxymethyl cellulose, 6-10 parts film-forming agent, 1.5-2.5 parts thickener, 1-2 parts wetting agent, 0.5-1 part humectant, 0.2-0.4 parts antibacterial agent, 0.5-0.8 parts corrosion inhibitor, and 100 parts deionized water; The wetting agent is prepared by the following method: S1: 9-Octadecenamine reacts with glycidyl to form intermediate 1, and the reaction equation is shown below:

[0006] S2: Intermediate 1 reacts with 1,4-di(bromomethyl)benzene to generate intermediate 2, and the reaction equation is shown below:

[0007] S3: Intermediate 2 reacts with the hydroxyl group of mercaptohexaethylene glycol to generate a wetting agent. The reaction equation is shown below:

[0008] In step S1, the molar ratio of 9-octadeceneamine to glycidol is 1:(1.03-1.05).

[0009] In step S2, the molar ratio of intermediate 1 to 1,4-di(bromomethyl)benzene is (2.05-2.1):1.

[0010] In step S3, the molar ratio of intermediate 2 to mercaptohexaethylene glycol hydroxyl group is 1:(2.03-2.05).

[0011] The antibacterial agent is prepared by the following method: N1: 3,3'-Dithiodipropionic acid reacts with 1-amino-5-hexene to generate intermediate A, as shown in the following schematic equation:

[0012] N2: The intermediate reacts with 4-(decoxy)-N-hydroxybenzoimide chloride to generate an antibacterial agent, and the reaction equation is shown below:

[0013] In step N1, the molar ratio of 3,3'-dithiodipropionic acid to 1-amino-5-hexene is 1:2.05; in step N2, the molar ratio of the intermediate to 4-(decoxy)-N-hydroxybenzoimide chloride is 1:4.05.

[0014] The film-forming agent is polyethylene glycol; the thickener is hydroxyethyl cellulose.

[0015] The humectant is glycerol; the corrosion inhibitor is sodium benzoate.

[0016] The preparation steps for dust suppressants used in coal transportation are as follows: (1) Weigh out the following by weight: 8-12 parts sodium carboxymethyl cellulose, 6-10 parts film-forming agent, 1.5-2.5 parts thickener, 1-2 parts wetting agent, 0.5-1 part humectant, 0.2-0.4 parts antibacterial agent, 0.5-0.8 parts corrosion inhibitor, and 100 parts deionized water; (2) Heat and stir deionized water with sodium carboxymethyl cellulose until well mixed, cool down, add film-forming agent, thickener, wetting agent, humectant, antibacterial agent and corrosion inhibitor, stir until well mixed, and the dust suppressant for coal transportation is obtained.

[0017] A method for using a dust suppressant for coal transportation is as follows: dilute the prepared dust suppressant, and then spray it evenly onto the surface of the coal at a spraying rate of 1.5-3 L / m². 2 .

[0018] Due to the adoption of the above technical solutions, the beneficial effects of the present invention include: The dust suppressant for coal transportation prepared by this invention exhibits excellent wetting and antibacterial properties. The wetting agent added to the components contains both aromatic benzene rings and long-chain alkyl hydrophobic structures, as well as polyether chains and polyhydroxyl hydrophilic structures. By reducing the interfacial tension on the coal surface, it promotes rapid wetting and uniform spreading of the dust suppressant solution on the coal surface. The added antibacterial agent enhances the antibacterial properties of the dust suppressant through the synergistic effect of dithioamide structures, isoxazoline structures, aromatic benzene rings, and long-chain alkyl groups. Coal dust samples sprayed with the dust suppressant prepared by this invention exhibit good wind erosion resistance. Attached Figure Description

[0019] Figure 1 The image shows the proton NMR spectrum of the wetting agent prepared in Example 1.

[0020] Figure 2 The image shows the proton NMR spectrum of the antibacterial agent prepared in Example 4.

[0021] Figure 3 The image shows a high-resolution mass spectrum of the wetting agent prepared in Example 1.

[0022] Figure 4The image shows a high-resolution mass spectrum of the antibacterial agent prepared in Example 4. Detailed Implementation

[0023] The following description, in conjunction with specific embodiments, provides further details, but the present invention is not limited to these embodiments.

[0024] Example 1: Preparation of wetting agent: S1: Under nitrogen protection, 200 ml of anhydrous acetonitrile and 0.1 mol of 9-octadeceneamine were stirred and mixed. 0.103 mol of glycidyl ether was slowly added dropwise over 10 min. The mixture was then heated to 55 °C and reacted for 6 h. After cooling to room temperature, the mixture was distilled under reduced pressure at 50 °C for 1 h. 150 ml of cold n-hexane was added and stirred to precipitate the product. The product was filtered, and the filter cake was washed with cold n-hexane (3 × 50 ml). The product was then dried under vacuum at 50 °C for 8 h to obtain intermediate 1. Its 1H NMR data are as follows: 1 H NMR (400 MHz, Chloroform- d ) δ 5.35 (s, 2H), 3.85 (d, J = 5.0 Hz, 1H), 3.73 (d, J = 5.0 Hz, 1H), 3.67-3.61 (m, 1H), 3.59(d, J = 5.5 Hz, 1H), 3.46 (dd, J = 11.6, 4.8 Hz, 1H), 3.33-3.28 (m, 1H), 2.82(dd, J = 12.4, 1.5 Hz, 1H), 2.73 (dd, J = 1.6, 1.5 Hz, 2H), 2.65 (dd, J =12.4, 1.6 Hz, 1H), 2.02 (s, 4H), 1.50 (s, 2H), 1.35-1.26 (m, 22H), 0.90 (t, J= 6.4 Hz, 3H); HRMS (m / z):342.3287[M+H] + ; S2: Under nitrogen protection, 600 ml of anhydrous ethanol, 0.205 mol of intermediate 1, 0.1 mol of 1,4-di(bromomethyl)benzene, and 0.21 mol of potassium carbonate were stirred and mixed. The mixture was heated to 70 °C and reacted for 20 h. After cooling to room temperature, the mixture was filtered, distilled under reduced pressure at 50 °C for 1 h, and 300 ml of deionized water was slowly added. The mixture was extracted with ethyl acetate (2 × 300 ml). The organic phases were combined, washed with deionized water (2 × 150 ml), dried over 40 g of anhydrous magnesium sulfate, filtered, and distilled under reduced pressure at 50 °C for 1 h to obtain intermediate 2. Its 1H NMR data are as follows: 1 H NMR (400 MHz, Chloroform- d) δ 7.21 (s, 4H), 5.35 (s, 4H), 3.88 (d, J =5.0 Hz, 2H), 3.71-3.65 (m, 2H), 3.64-3.43 (m, 8H), 3.41 (d, J = 4.9 Hz, 2H), 2.73-2.44 (m, 8H), 2.02 (s, 8H), 1.52 (d, J = 2.6 Hz, 4H), 1.34-1.26 (m,44H), 0.90 (t, J = 6.4 Hz, 6H); HRMS (m / z):785.7062[M+H] + ; S3: Under nitrogen protection, 600 ml of tetrahydrofuran, 0.1 mol of intermediate 2, 0.203 mol of mercaptohexaethylene glycol hydroxyl group, and 1 g of 2,2-dimethoxy-2-phenylacetophenone were stirred and mixed. The mixture was then irradiated at 100 W under 365 nm UV light for 30 min at room temperature, followed by vacuum distillation at 40 °C for 2 h. 550 ml of cold diethyl ether was added and stirred to precipitate the precipitate. The precipitate was filtered, washed with 2 × 50 ml of cold diethyl ether, and dried under vacuum at 40 °C for 12 h to obtain the wetting agent. Its proton NMR spectrum is shown below. Figure 1 As shown, the proton NMR data are as follows: 1 HNMR (400 MHz, Chloroform- d δ 7.21 (s, 4H), 3.88 (d, J = 5.0 Hz, 2H), 3.73-3.68 (m, 2H), 3.68-3.43 (m, 52H), 3.41 (d, J = 4.9 Hz, 2H), 2.91 (t, J = 5.5Hz, 2H), 2.87-2.77 (m, 4H), 2.75 (s, 2H), 2.71-2.46 (m, 8H), 1.51 (dd, J = 8.2, 2.0 Hz, 12H), 1.35-1.25 (m, 48H), 0.90 (t, J = 6.4 Hz, 6H); its high-resolution mass spectrum is shown below. Figure 3 As shown, the mass spectrometry data are as follows: HRMS (m / z): 1381.9948 [M+H] + .

[0025] Example 2: Preparation of wetting agent: S1: Under nitrogen protection, 200 ml of anhydrous acetonitrile and 0.1 mol of 9-octadeceneamine were stirred and mixed. 0.104 mol of glycidyl ether was slowly added dropwise over 10 min. The mixture was heated to 60 °C and reacted for 5 h. After cooling to room temperature, the mixture was distilled under reduced pressure at 50 °C for 1 h. 150 ml of cold n-hexane was added and stirred to precipitate the precipitate. The precipitate was filtered, and the filter cake was washed with cold n-hexane (3 × 50 ml). The mixture was then dried under vacuum at 50 °C for 8 h to obtain intermediate 1. S2: Under nitrogen protection, 600 ml of anhydrous ethanol, 0.208 mol of intermediate 1, 0.1 mol of 1,4-di(bromomethyl)benzene, and 0.21 mol of potassium carbonate were stirred and mixed. The mixture was heated to 70 °C and reacted for 20 h. After cooling to room temperature, the mixture was filtered and distilled under reduced pressure at 50 °C for 1 h. 300 ml of deionized water was slowly added, and the mixture was extracted with ethyl acetate (2 × 300 ml). The organic phases were combined, washed with deionized water (2 × 150 ml), dried with 40 g of anhydrous magnesium sulfate, filtered, and distilled under reduced pressure at 50 °C for 1 h to obtain intermediate 2. S3: Under nitrogen protection, 600 ml of tetrahydrofuran, 0.1 mol of intermediate 2, 0.204 mol of mercaptohexaethylene glycol hydroxyl group, and 1 g of 2,2-dimethoxy-2-phenylacetophenone were stirred and mixed. The mixture was then irradiated with 100 W of 365 nm ultraviolet light for 30 min at room temperature, followed by vacuum distillation at 40 °C for 2 h. 550 ml of cold diethyl ether was added and stirred to precipitate the precipitate. The precipitate was filtered, washed with cold diethyl ether (2 × 50 ml), and dried under vacuum at 40 °C for 12 h to obtain the wetting agent.

[0026] Example 3: Preparation of wetting agent: S1: Under nitrogen protection, 200 ml of anhydrous acetonitrile and 0.1 mol of 9-octadeceneamine were stirred and mixed. 0.105 mol of glycidyl ether was slowly added dropwise over 10 min. The mixture was heated to 65 °C and reacted for 4 h. After cooling to room temperature, the mixture was distilled under reduced pressure at 50 °C for 1 h. 150 ml of cold n-hexane was added and stirred to precipitate the precipitate. The precipitate was filtered, and the filter cake was washed with cold n-hexane (3 × 50 ml). The mixture was then dried under vacuum at 50 °C for 8 h to obtain intermediate 1. S2: Under nitrogen protection, 600 ml of anhydrous ethanol, 0.21 mol of intermediate 1, 0.1 mol of 1,4-di(bromomethyl)benzene, and 0.21 mol of potassium carbonate were stirred and mixed. The mixture was heated to 75 °C and reacted for 19 h. After cooling to room temperature, the mixture was filtered and distilled under reduced pressure at 50 °C for 1 h. 300 ml of deionized water was slowly added, and the mixture was extracted with ethyl acetate (2 × 300 ml). The organic phases were combined, washed with deionized water (2 × 150 ml), dried with 40 g of anhydrous magnesium sulfate, filtered, and distilled under reduced pressure at 50 °C for 1 h to obtain intermediate 2. S3: Under nitrogen protection, 600 ml of tetrahydrofuran, 0.1 mol of intermediate 2, 0.205 mol of mercaptohexaethylene glycol hydroxyl group, and 1 g of 2,2-dimethoxy-2-phenylacetophenone were stirred and mixed. The mixture was then irradiated with 100 W of 365 nm ultraviolet light for 30 min at room temperature, followed by vacuum distillation at 40 °C for 2 h. 550 ml of cold diethyl ether was added and stirred to precipitate the precipitate. The precipitate was filtered, washed with cold diethyl ether (2 × 50 ml), and dried under vacuum at 40 °C for 12 h to obtain the wetting agent.

[0027] Example 4: Preparation of antibacterial agent: N1: Under nitrogen protection, 600 ml of dichloromethane, 0.1 mol of 3,3'-dithiodipropionic acid, 45.8 g of 1-ethyl-(3-dimethylaminopropyl)carbodiimide hydrochloride, and 27.6 g of N-hydroxysuccinimide were stirred and mixed thoroughly. 0.205 mol of 1-amino-5-hexene was added in five equal batches, with a 5-min interval between batches. The mixture was reacted at room temperature for 12 h, filtered, and distilled under reduced pressure at 30 °C for 1 h. The crude product was purified by silica gel chromatography (V... 二氯甲烷 :V 甲醇 The ratio of crude oil to distillate was 15:1. The intermediate A was obtained by vacuum distillation at 30°C for 1 hour. Its 1H NMR data are as follows: 1 H NMR (400 MHz, Chloroform- d ) δ 6.34 (s, 2H), 5.65 (s, 2H), 5.07-4.94(m, 4H), 3.23 (s, 4H), 3.14 (d, J = 1.7 Hz, 4H), 2.51 (s, 4H), 2.03 (s, 4H), 1.53 (s, 4H), 1.45 (s, 4H); HRMS (m / z):373.1914[M+H] + ; N2: 1000 ml dichloromethane, 0.1 mol intermediate, 0.405 mol 4-(decoxy)-N-hydroxybenzoimide chloride, and 0.24 mol triethylamine were stirred and mixed thoroughly. The mixture was reacted at room temperature for 12 h. After filtration, the filtrate was washed with 500 ml deionized water, dried over 60 g anhydrous magnesium sulfate, filtered, and distilled under reduced pressure at 30 °C for 1 h. The crude product was purified by silica gel column chromatography (V... 石油醚 :V 乙酸乙酯 =1:1), distilled under reduced pressure at 40℃ for 1 h, to obtain the antibacterial agent; its proton NMR spectrum is as follows. Figure 2 As shown, the proton NMR data are as follows: 1 H NMR (400MHz, Chloroform- dδ 7.50-7.42 (m, 4H), 6.96-6.88 (m, 4H), 6.34 (d, J = 1.5Hz, 2H), 4.44 (s, 2H), 4.01 (s, 4H), 3.34-3.09 (m, 12H), 2.51 (d, J = 1.4 Hz, 4H), 1.80 (d, J = 12.4 Hz, 6H), 1.62 (d, J = 12.4 Hz, 2H), 1.56-1.43 (m, 12H), 1.35-1.26 (m, 24H), 0.90 (t, J = 6.3 Hz, 6H); its high-resolution mass spectrum is shown below. Figure 4 The mass spectrometry data are as follows: HRMS (m / z): 923.5671 [M+H] + .

[0028] Example 5: Preparation of dust suppressant for coal transportation: (1) 800g sodium carboxymethyl cellulose, 600g film-forming agent (polyethylene glycol PEG4000), 150g thickener (hydroxyethyl cellulose), 100g wetting agent (prepared in Example 1), 50g humectant (sodium polyacrylate), 20g antibacterial agent (prepared in Example 4), 50g corrosion inhibitor (sodium benzoate), and 10000g deionized water; (2) Mix deionized water with sodium carboxymethyl cellulose, heat to 60°C, stir at 300 rpm for 20 min, cool to room temperature, add film-forming agent, thickener, wetting agent, humectant, antibacterial agent and corrosion inhibitor, stir at 500 rpm for 30 min, and the dust suppressant for coal transportation is obtained.

[0029] Example 6: Preparation of dust suppressant for coal transportation: (1) 1000g sodium carboxymethyl cellulose, 800g film-forming agent (polyethylene glycol PEG4000), 200g thickener (hydroxyethyl cellulose), 150g wetting agent (prepared in Example 2), 80g humectant (sodium polyacrylate), 30g antibacterial agent (prepared in Example 4), 65g corrosion inhibitor (sodium benzoate), and 10000g deionized water; (2) Mix deionized water with sodium carboxymethyl cellulose, heat to 60°C, stir at 300 rpm for 20 min, cool to room temperature, add film-forming agent, thickener, wetting agent, humectant, antibacterial agent and corrosion inhibitor, stir at 500 rpm for 30 min, and the dust suppressant for coal transportation is obtained.

[0030] Example 7 Preparation of dust suppressant for coal transportation: (1) 1200g sodium carboxymethyl cellulose, 1000g film-forming agent (polyethylene glycol PEG4000), 250g thickener (hydroxyethyl cellulose), 200g wetting agent (prepared in Example 3), 100g humectant (sodium polyacrylate), 40g antibacterial agent (prepared in Example 4), 80g corrosion inhibitor (sodium benzoate), and 10000g deionized water; (2) Mix deionized water with sodium carboxymethyl cellulose, heat to 60°C, stir at 300 rpm for 20 min, cool to room temperature, add film-forming agent, thickener, wetting agent, humectant, antibacterial agent and corrosion inhibitor, stir at 500 rpm for 30 min, and the dust suppressant for coal transportation is obtained.

[0031] Example 8: Method of using dust suppressant for coal transportation: The dust suppressant prepared in Example 5 was diluted with deionized water to a concentration of 3 wt%, and then evenly sprayed onto the surface of the coal dust sample at a spraying rate of 3 L / m². 2 .

[0032] Example 9: Method of using dust suppressant for coal transportation: The dust suppressant prepared in Example 6 was diluted with deionized water to a concentration of 4 wt%, and then evenly sprayed onto the surface of the coal dust sample at a spraying rate of 2 L / m². 2 .

[0033] Example 10: Method of using dust suppressant for coal transportation: The dust suppressant prepared in Example 7 was diluted with deionized water to a concentration of 5 wt%, and then evenly sprayed onto the surface of the coal dust sample at a spraying rate of 1.5 L / m². 2 .

[0034] Comparative Example 1 The raw material composition and preparation method of the dust suppressant for coal transportation are basically the same as those in Example 6, except that the wetting agent is replaced with an equal weight of the wetting agent prepared by the following method: The preparation method of the wetting agent is basically the same as that in Example 2, except that 9-octadeceneamine in step S1 is replaced with an equimolar amount of 9-decene-1-amine.

[0035] Comparative Example 2 The raw material composition and preparation method of the dust suppressant for coal transportation are basically the same as those in Example 6, except that the wetting agent is replaced with an equal weight of the wetting agent prepared by the following method: The preparation method of the wetting agent is basically the same as that in Example 2, except that the 1,4-di(bromomethyl)benzene in step S2 is replaced with an equimolar amount of 1,3-dibromopropane.

[0036] Comparative Example 3 The raw material composition and preparation method of the dust suppressant for coal transportation are basically the same as those in Example 6, except that the wetting agent is replaced with an equal weight of the wetting agent prepared by the following method: The preparation method of the wetting agent is basically the same as that in Example 2, except that the mercaptohexaethylene glycol hydroxyl group in step S3 is replaced with an equimolar amount of mercaptotriethylene glycol hydroxyl group.

[0037] Comparative Example 4 The raw material composition and preparation method of the dust suppressant for coal transportation are basically the same as in Example 6, except that the antibacterial agent is replaced with an equal weight of antibacterial agent prepared by the following method: The preparation method of the antibacterial agent is basically the same as that in Example 4, except that the 3,3'-dithiodipropionic acid in step N1 is replaced with an equimolar amount of 3,3'-dithiodipropionic acid.

[0038] Comparative Example 5 The raw material composition and preparation method of the dust suppressant for coal transportation are basically the same as in Example 6, except that the antibacterial agent is replaced with an equal weight of antibacterial agent prepared by the following method: The preparation method of the antibacterial agent is basically the same as that in Example 4, except that 4-(decoxy)-N-hydroxybenzoimide acyl chloride in step N2 is replaced with an equimolar amount of ALPHA-chloro-4-methoxybenzaldehyde oxime.

[0039] Comparative Example 6 The raw material composition and preparation method of the dust suppressant for coal transportation are basically the same as in Example 6, except that the antibacterial agent is replaced with an equal weight of antibacterial agent prepared by the following method: The preparation method of the antibacterial agent is basically the same as that in Example 4, except that the amount of 4-(decoxy)-N-hydroxybenzoimide chloride in step N2 is replaced with 0.205 mol and the amount of triethylamine is replaced with 0.12 mol.

[0040] The coal used in the embodiments and comparative examples of this application was collected from the Zhifengshan mining area in Shuozhou, Shanxi Province. Before use, it was ground and passed through a 200-mesh sieve to obtain coal dust samples. The sodium carboxymethyl cellulose was of type IH6, with a viscosity of 1000 mPa·s, and was produced by Shandong Weifang Lite Composite Materials Co., Ltd. The hydroxyethyl cellulose was of type Natrosol. TM 250HHBR; The CAS number for 4-(decoxy)-N-hydroxybenzoimide chloride is 925692-73-5.

[0041] The wetting and antibacterial properties of the dust suppressants prepared in Examples 5-7 and Comparative Examples 1-6 were tested, and the wind erosion of the coal dust samples after spraying with the dust suppressant in Examples 8-9 was tested. The test results are shown in Table 1.

[0042] Wetting performance test: Coal dust settling experiments were conducted on the dust suppressants prepared in Examples 5-7 and Comparative Examples 1-6. The wetting performance of the dust suppressants on coal dust was determined by the coal dust settling time. The dust suppressant was diluted with deionized water to a concentration of 4wt%. 20 ml of the dust suppressant solution was placed in a beaker, and 200 mg of coal dust sample was quickly poured into the beaker containing the dust suppressant solution. Timing was started when the coal dust began to contact the solution surface and stopped when the coal dust completely settled below the solution surface. The measurement was repeated three times, and the average value was taken as the measured value of the settling test.

[0043] Antibacterial performance test: Staphylococcus aureus was used as the test strain. Individual colonies were selected from the test strain and diluted with physiological saline to a bacterial concentration of 10. 8 CFU / ml. 100 μl of bacterial suspension was added to sterile LB liquid medium, followed by 200 μl of the dust suppressant prepared in Examples 5-7 and Comparative Examples 1-6 (diluted to 4 wt% with deionized water). The mixture was placed on a constant-temperature shaker and shaken at 250 rpm for 1 h at 37°C. It was then diluted with 9 ml of PBS buffer (0.1 M, pH 7.4), and the diluted bacterial suspension was quantitatively inoculated into culture dishes containing sterile agar medium (AGAR). After incubation at 37°C for 48 h, bacterial counts were performed. The control group consisted of dust suppressant prepared without the addition of any antibacterial agent (the raw material composition and preparation method of the dust suppressant were basically the same as in Example 6, except that no antibacterial agent was added). The inhibition rate was calculated using the following formula: ; In the formula, W—antibacterial inhibition rate; A—colony count of the control group after 48 hours; B—colony count of the dust suppressants prepared in Examples 5-7 and Comparative Examples 1-6 after 48 hours.

[0044] Wind erosion test: First, weigh the coal dust samples from Examples 8-10 after spraying with the dust suppressant, and record the weight as follows: Then, a blower was used to purge the surface of the coal dust sample at a wind speed of 20 m / s for 5 minutes. The weight of the remaining coal dust sample was then measured and recorded as follows. The wind erosion rate is calculated using the following formula: ; In the formula, —Wind erosion rate; —Weight of the coal dust sample before purging; —Weight of the coal dust sample after purging.

[0045] The dust suppressants prepared in Comparative Examples 1-6 were diluted with deionized water to a concentration of 4 wt%, and then evenly sprayed onto the surface of the coal dust samples at a spraying rate of 2 L / m². 2The wind erosion rate was determined according to the wind erosion test method described above.

[0046] Table 1 Performance Test Data

[0047] As can be seen from Table 1, the dust suppressants prepared in Examples 5-7 of this application have excellent wetting and antibacterial properties, and the coal dust samples sprayed with the dust suppressants prepared in Examples 5-7 have good wind erosion properties.

[0048] The wetting agent molecules added to the dust suppressant components prepared in Examples 5-7 of this application have amphiphilic structural characteristics, simultaneously incorporating aromatic benzene rings and long-chain alkyl hydrophobic structures, as well as polyether chains and polyhydroxyl hydrophilic structures. During the coal-water interface interaction, this wetting agent can undergo spontaneous interfacial orientation: the aromatic benzene rings and long-chain alkyl groups are firmly adsorbed onto the coal surface through hydrophobic interactions and π-π interactions; while the polyether chains and hydroxyl groups in the molecule are oriented towards the aqueous phase, forming a continuous and stable hydrogen bond network with water molecules. The interfacial orientation adsorption and synergistic effect of the wetting agent molecules significantly weaken the hydrophobicity of the coal surface, reduce the interfacial tension of the coal-water interface, and enable the dust suppressant solution to spread rapidly and fully wet the coal surface. The alkyl chain of the wetting agent used in Comparative Example 1 is shorter than that in the examples, resulting in a weakened hydrophobic effect and a reduced ability to lower the interfacial tension of the coal surface, leading to a decrease in the wetting performance of the dust suppressant.

[0049] The antibacterial agent added to the dust suppressant components prepared in Examples 5-7 of this application is a multifunctional synergistic antibacterial agent, whose molecule simultaneously incorporates an aromatic benzene ring, an isoxazoline structure, a long-chain alkyl group, and a dithioamide structure. During the antibacterial process, the antibacterial agent first achieves stable adsorption and initial anchoring on the microbial surface through π-π interactions between the aromatic benzene ring and aromatic groups in the lipids and proteins on the microbial cell surface. Subsequently, the isoxazoline ring in the molecule coordinates with the phospholipid head groups and membrane proteins of the cell membrane through its N and O heteroatoms, disrupting the ordered arrangement of the phospholipid bilayer. Simultaneously, the long-chain alkyl group inserts into the lipid layer of the cell membrane through hydrophobic interactions, synergistically exacerbating the perturbation of the membrane structure, ultimately leading to cell lysis. Building upon the aforementioned membrane-disrupting effects, the dithioamide structure in the antibacterial agent can break down under the action of reducing enzymes within microbial cells. The released sulfur-containing active fragments inhibit key metabolic enzymes, thereby interfering with microbial energy metabolism and biosynthesis. Simultaneously, the amide bond hydrolysis of the dithioamide structure in an aqueous environment generates small molecules of carboxylic acids and amines with antibacterial activity, further enhancing the inhibitory effect on microbial growth. The synergistic effect of the various structures within the antibacterial agent molecule effectively inhibits component degradation and performance decline caused by microbial growth during dust suppression, preventing dust suppressant failure and significantly extending the effective action time of the dust suppressant in practical application environments, thus improving its durability and stability. In Comparative Example 6, the antibacterial agent molecule did not form an isoxazoline structure, making it difficult to achieve the synergistic membrane-disrupting effect of the isoxazoline ring and long-chain alkyl group, resulting in a poorer antibacterial effect.

[0050] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. However, any modifications, alterations, and variations made by those skilled in the art without departing from the scope of the present invention based on the disclosed technical content are equivalent embodiments of the present invention. Furthermore, any modifications, alterations, and variations made to the above embodiments based on the essential technology of the present invention are still within the protection scope of the present invention.

Claims

1. A dust suppressant for coal transportation, characterized in that, The ingredients include the following parts by weight: 8-12 parts sodium carboxymethyl cellulose, 6-10 parts film-forming agent, 1.5-2.5 parts thickener, 1-2 parts wetting agent, 0.5-1 part humectant, 0.2-0.4 parts antibacterial agent, 0.5-0.8 parts corrosion inhibitor, and 100 parts deionized water; The wetting agent is prepared by the following method: S1: 9-Octadeceneamine reacts with glycidyl to form intermediate 1. S2: Intermediate 1 reacts with 1,4-di(bromomethyl)benzene to generate intermediate 2. S3: Intermediate 2 reacts with mercaptohexaethylene glycol hydroxyl groups to generate a wetting agent.

2. The dust suppressant for coal transportation according to claim 1, characterized in that, In step S1, the molar ratio of 9-octadeceneamine to glycidol is 1:(1.03-1.05).

3. The dust suppressant for coal transportation according to claim 1, characterized in that, In step S2, the molar ratio of intermediate 1 to 1,4-di(bromomethyl)benzene is (2.05-2.1):

1.

4. The dust suppressant for coal transportation according to claim 1, characterized in that, In step S3, the molar ratio of intermediate 2 to mercaptohexaethylene glycol hydroxyl group is 1:(2.03-2.05).

5. The dust suppressant for coal transportation according to claim 1, characterized in that, The antibacterial agent is prepared by the following method: N1: 3,3'-Dithiodipropionic acid reacts with 1-amino-5-hexene to form intermediate A. N2: The intermediate reacts with 4-(decoxy)-N-hydroxybenzoimide chloride to generate an antibacterial agent.

6. The dust suppressant for coal transportation according to claim 5, characterized in that, In step N1, the molar ratio of 3,3'-dithiodipropionic acid to 1-amino-5-hexene is 1:2.05; in step N2, the molar ratio of the intermediate to 4-(decoxy)-N-hydroxybenzoimide chloride is 1:4.

05.

7. The dust suppressant for coal transportation according to claim 1, characterized in that, The film-forming agent is polyethylene glycol; the thickener is hydroxyethyl cellulose.

8. A dust suppressant for coal transportation according to claim 1, characterized in that, The humectant is glycerol; the corrosion inhibitor is sodium benzoate.

9. A dust suppressant for coal transportation according to claim 1, characterized in that, The preparation steps are as follows: (1) Weigh out the following by weight: 8-12 parts sodium carboxymethyl cellulose, 6-10 parts film-forming agent, 1.5-2.5 parts thickener, 1-2 parts wetting agent, 0.5-1 part humectant, 0.2-0.4 parts antibacterial agent, 0.5-0.8 parts corrosion inhibitor, and 100 parts deionized water; (2) Heat and stir deionized water with sodium carboxymethyl cellulose until well mixed, cool down, add film-forming agent, thickener, wetting agent, humectant, antibacterial agent and corrosion inhibitor, stir until well mixed, and the dust suppressant for coal transportation is obtained.

10. A method of using the dust suppressant for coal transportation according to any one of claims 1-9, characterized in that, The method involves diluting the prepared dust suppressant and then spraying it evenly onto the surface of the coal at a rate of 1.5-3 L / m². 2 .

Images