Hydrogel dust suppressant for coal storage and transportation as well as preparation method and application of hydrogel dust suppressant

Abstract

The invention discloses a hydrogel dust suppressant for coal storage and transportation as well as a preparation method and application thereof, and belongs to the technical field of dust suppression. The hydrogel dust suppressant for coal storage and transportation comprises the following components in parts by mass: 1-20 parts of a film-forming agent, 0.5-5 parts of a film-forming auxiliary agent, 0.5-15 parts of a thickening agent, 100-300 parts of a functional monomer, 20-50 parts of a neutralizing agent, 0.5-5 parts of a cross-linking agent, 0.5-5 parts of an initiator and 3-30 parts of a surfactant. The prepared hydrogel dust suppressant for coal storage and transportation has excellent film-forming property and cohesiveness, and dust flying in the coal transportation process is effectively inhibited. In addition, the prepared dust suppressant for coal storage and transportation is low in synthesis cost, the dilution multiple reaches up to 500 times, the transportation cost is greatly saved, the synthesis process is simple, the yield is high, and the dust suppressant is suitable for industrial production.

Description

Technical Field

[0001] The invention belongs to the technical field of dust suppression, and in particular relates to a hydrogel dust suppressant for coal storage and use, and a preparation method and application thereof. Background Art

[0002] Coal is a fossil fuel with abundant reserves and widespread distribution. It is the main energy source and has been used since the 18th century. However, during the storage and transportation of coal, a large amount of coal dust will be released due to wind disturbance and bumpy roads, which will not only cause direct loss of coal itself, but also cause harm to human health; therefore, controlling the release of coal dust during coal storage and transportation is the key to reducing waste and protecting the environment.

[0003] In order to solve the problem of coal dust pollution during coal storage and transportation, different physical and chemical dust suppression technologies have been developed. Among them, the physical spraying method is simple to operate, but it requires repeated spraying to improve the dust suppression effect, resulting in a waste of water resources. Traditional chemical dust suppressants, such as calcium chloride and magnesium chloride, which are mainly adhesive, condensing, wetting and composite types, have high solubility in water and strong permeability, but poor adhesion and degradability, and are too corrosive, which limits their widespread use. Although chemical dust suppressants containing crude oil and asphalt have good moisturizing ability, they are toxic and pollute water and soil. Therefore, it is of great significance and broad prospects to develop a low-cost, environmentally friendly, efficient and multifunctional hydrogel dust suppressant. Summary of the invention

[0004] In order to solve the problems of high cost and low dilution ratio of current dust suppressants, the present invention provides a hydrogel dust suppressant for coal storage and utilization. The dust suppressant has good wind erosion resistance, good film-forming property, high dilution ratio, can save costs, and has significant dust suppression effect.

[0005] The technical solution of the present invention is as follows:

[0006] The present invention provides a hydrogel dust suppressant for coal storage and use, comprising the following components in parts by mass:

[0007] 1 to 20 parts of film-forming agent, 0.5 to 5 parts of film-forming aid, 0.5 to 15 parts of thickener, 100 to 300 parts of functional monomer, 20 to 50 parts of neutralizer, 0.5 to 5 parts of cross-linking agent, 0.5 to 5 parts of initiator, and 3 to 30 parts of surfactant.

[0008] In a specific embodiment, the hydrogel dust suppressant for coal storage and use comprises the following components in parts by weight:

[0009] 15 parts of film former, 3 parts of film-forming aid, 10 parts of thickener, 220 parts of functional monomer, 37 parts of neutralizer, 4.5 parts of cross-linking agent, 3 parts of initiator, and 20 parts of surfactant.

[0010] In the above technical solution, the film-forming agent is one or more of polyvinyl alcohol, polyacrylamide, hyaluronic acid, and agar.

[0011] In the above technical solution, the film-forming aid is one or more of ethylene glycol, propylene glycol, hexylene glycol, dodecyl alcohol ester, propylene glycol ethyl ether, ethylene glycol butyl ether, and propylene glycol butyl ether.

[0012] In the above technical solution, the thickener is one or more of sodium carboxymethyl starch, methyl cellulose, hydroxymethyl cellulose, and xanthan gum.

[0013] In the above technical solution, the functional monomer is one or both of acrylic acid and acrylamide.

[0014] In the above technical solution, the neutralizing agent is one or more of calcium hydroxide, sodium hydroxide, potassium hydroxide, sodium bicarbonate, sodium carbonate, ethanolamine, and ethylenediamine.

[0015] In the above technical solution, the cross-linking agent is one or more of N,N'-methylenebisacrylamide, diallylpyridine and diallylbenzene.

[0016] In the above technical solution, the initiator is one or more of ammonium persulfate, potassium persulfate, and sodium persulfate.

[0017] In the above technical scheme, the surfactant is one or more of potassium oleate, sodium oleate, sodium ricinoleate, sodium stearate, sodium lauryl sulfate, sodium lignin sulfonate, fatty alcohol polyoxyethylene ether, polyoxyethylene amide, fatty acid potassium and fatty acid sodium, sodium dodecyl sulfate, sodium dodecylbenzene sulfonate, nonyl polyoxyethylene ether, and perfluoro surfactant.

[0018] The present invention provides a method for preparing the above-mentioned hydrogel dust suppressant for coal storage and utilization, and the steps are as follows:

[0019] The film-forming agent solution and the thickener solution are mixed, the reaction temperature is maintained at 80-100°C, and then the functional monomer and the neutralizer solution are added; after the reaction is allowed to proceed for 2-10 minutes, the initiator and the cross-linking agent are added; after the reaction is allowed to proceed for 1-3 hours, the surfactant and the film-forming aid are added, and after they are dissolved and mixed evenly, a hydrogel dust suppressant is obtained.

[0020] In the above preparation method, the mass concentration of the film-forming agent solution is selected from 1 to 3%; the mass concentration of the thickener solution is selected from 1 to 3%; and the mass concentration of the neutralizer solution is selected from 10 to 40%.

[0021] The present invention provides application of the hydrogel dust suppressant for coal storage and transportation in dust suppression for coal storage and transportation.

[0022] The present invention provides a method for suppressing dust during coal storage and transportation, the steps of which are as follows:

[0023] The hydrogel dust suppressant is diluted in water at a mass ratio of 1:50-500, and then the mixture is stirred at 2.2-3.5 L / m 2 The hydrogel dust suppressant dilution is sprayed on the coal surface with a spraying amount to achieve the dust suppression effect during coal storage and transportation.

[0024] The beneficial effects of the present invention are:

[0025] The hydrogel dust suppressant for coal storage prepared by the present invention mainly produces synergistic effects between a thickener containing a large number of strong polar groups such as carboxyl and hydroxyl groups and a film-forming agent to increase the viscosity of the solution to generate a gel. The functional monomer molecule contains one C=C unsaturated bond, which is easily initiated by free radicals and can be directly grafted and copolymerized with the thickener to form a hydrogen bond multilayer network through hydrogen bond interaction. It has excellent film-forming and adhesion properties and effectively suppresses the flying of dust during coal transportation. At the same time, the formed adhesive film has a certain hardness, a high crust strength (film-forming strength), and strong permeability (solidified layer thickness), which greatly improves the thickness of the solidified layer, thereby improving the wind erosion resistance and not easily causing secondary dust. In addition, the dust suppressant for coal storage prepared by the present invention has a low synthesis cost, can be diluted up to 500 times, greatly saves transportation costs, and has a simple synthesis process and high yield, which is suitable for industrial production. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 Schematic diagram of the synthesis principle of hydrogel dust suppressant;

[0027] Figure 2 Schematic diagram of the tensile properties of the hydrogel dust suppressant;

[0028] Figure 3 Schematic diagram of the dust suppression principle of hydrogel dust suppressant. DETAILED DESCRIPTION

[0029] Other materials used in the present invention, if not otherwise stated, can be obtained through commercial channels. Other terms used in the present invention, unless otherwise specified, generally have the meanings commonly understood by those of ordinary skill in the art. The present invention is further described in detail below in conjunction with specific examples and with reference to data. The following examples are only for illustrating the present invention, and are not intended to limit the scope of the present invention in any way.

[0030] Example 1

[0031] Preparation of hydrogel dust suppressant:

[0032] (1) Components

[0033] Polyvinyl alcohol 10g, dodecyl alcohol ester 3g, xanthan gum 10g, acrylic acid 220g, sodium hydroxide 37g, N,N'-methylenebisacrylamide 4.5g, ammonium persulfate 3g, sodium dodecylbenzene sulfonate 20g;

[0034] Among them, polyvinyl alcohol is a film-forming agent; dodecyl alcohol ester is a film-forming aid; xanthan gum is a thickener; acrylic acid is a functional monomer; sodium hydroxide is a neutralizer; N,N'-methylenebisacrylamide is a cross-linking agent; ammonium persulfate is an initiator; and sodium dodecylbenzene sulfonate is a surfactant.

[0035] (2) Preparation method

[0036] The temperature of the No. 1 reactor was raised to 98°C, 500g of deionized water was added to a three-necked flask, and polyvinyl alcohol was slowly added until it was completely dissolved; the temperature of the No. 2 reactor was raised to 85°C, 500g of deionized water was added to the three-necked flask, and then xanthan gum was slowly added, and after it was completely dissolved, it was poured into the three-necked flask of the No. 1 reactor and mixed evenly; the temperature of the No. 1 reactor was adjusted to 85°C, acrylic acid was used as additive A, sodium hydroxide was dissolved in 86g of water and stirred to dissolve to prepare additive B, and additives A and B were slowly added dropwise to the three-necked flask of the No. 1 reactor at the same time; after the reaction lasted for 5 minutes, ammonium persulfate and N,N'-methylenebisacrylamide were added; after the reaction lasted for 2 hours, sodium dodecylbenzenesulfonate and dodecyl alcohol ester were added, and after they were dissolved, they were removed from the pot to obtain a hydrogel dust suppressant.

[0037] Example 2

[0038] Preparation of hydrogel dust suppressant:

[0039] (1) Components

[0040] Polyvinyl alcohol 15g, dodecyl alcohol ester 3g, xanthan gum 10g, acrylic acid 220g, sodium hydroxide 37g, N,N'-methylenebisacrylamide 4.5g, ammonium persulfate 3g, sodium dodecylbenzene sulfonate 20g;

[0041] Among them, polyvinyl alcohol is a film-forming agent; dodecyl alcohol ester is a film-forming aid; xanthan gum is a thickener; acrylic acid is a functional monomer; sodium hydroxide is a neutralizer; N,N'-methylenebisacrylamide is a cross-linking agent; ammonium persulfate is an initiator; and sodium dodecylbenzene sulfonate is a surfactant.

[0042] (2) Preparation method

[0043] The temperature of the No. 1 reactor was raised to 98°C, 500g of deionized water was added to a three-necked flask, and polyvinyl alcohol was slowly added until it was completely dissolved; the temperature of the No. 2 reactor was raised to 85°C, 500g of deionized water was added to the three-necked flask, and then xanthan gum was slowly added, and after it was completely dissolved, it was poured into the three-necked flask of the No. 1 reactor and mixed evenly; the temperature of the No. 1 reactor was adjusted to 85°C, acrylic acid was used as additive A, sodium hydroxide was dissolved in 86g of water and stirred to dissolve to prepare additive B, and additives A and B were slowly added dropwise to the three-necked flask of the No. 1 reactor at the same time; after the reaction lasted for 5 minutes, ammonium persulfate and N,N'-methylenebisacrylamide were added; after the reaction lasted for 2 hours, sodium dodecylbenzenesulfonate and dodecyl alcohol ester were added, and after they were dissolved, they were removed from the pot to obtain a hydrogel dust suppressant.

[0044] Example 3

[0045] Preparation of hydrogel dust suppressant:

[0046] (1) Components

[0047] Polyvinyl alcohol 10g, dodecyl alcohol ester 3g, xanthan gum 10g, acrylamide 220g, sodium hydroxide 37g, N,N'-methylenebisacrylamide 4.5g, ammonium persulfate 3g, sodium dodecylbenzene sulfonate 20g;

[0048] Among them, polyvinyl alcohol is a film-forming agent; dodecyl alcohol ester is a film-forming aid; xanthan gum is a thickener; acrylamide is a functional monomer; sodium hydroxide is a neutralizer; N,N'-methylenebisacrylamide is a cross-linking agent; ammonium persulfate is an initiator; and sodium dodecylbenzene sulfonate is a surfactant.

[0049] (2) Preparation method

[0050] The temperature of the No. 1 reactor was raised to 98°C, 500g of deionized water was added to a three-necked flask, and polyvinyl alcohol was slowly added until it was completely dissolved; the temperature of the No. 2 reactor was raised to 85°C, 500g of deionized water was added to the three-necked flask, and then xanthan gum was slowly added, and after it was completely dissolved, it was poured into the three-necked flask of the No. 1 reactor and mixed evenly; the temperature of the No. 1 reactor was adjusted to 85°C, acrylamide was used as additive A, sodium hydroxide was dissolved in 86g of water and stirred to dissolve to prepare additive B, and additives A and B were slowly added dropwise to the three-necked flask of the No. 1 reactor at the same time; after the reaction lasted for 5min, ammonium persulfate and N,N'-methylenebisacrylamide were added; after the reaction lasted for 2h, sodium dodecylbenzene sulfonate and dodecyl alcohol ester were added, and after they were dissolved, they were removed from the pot to obtain a hydrogel dust suppressant.

[0051] Example 4

[0052] Preparation of hydrogel dust suppressant:

[0053] (1) Components

[0054] Polyacrylamide 10g, dodecyl alcohol ester 3g, xanthan gum 10g, acrylic acid 220g, sodium hydroxide 37g, N,N'-methylenebisacrylamide 4.5g, ammonium persulfate 3g, sodium dodecylbenzene sulfonate 20g;

[0055] Among them, polyacrylamide is a film-forming agent; dodecyl alcohol ester is a film-forming aid; xanthan gum is a thickener; acrylic acid is a functional monomer; sodium hydroxide is a neutralizer; N,N'-methylenebisacrylamide is a cross-linking agent; ammonium persulfate is an initiator; and sodium dodecylbenzene sulfonate is a surfactant.

[0056] (2) Preparation method

[0057] The temperature of the No. 1 reactor was raised to 98°C, 500g of deionized water was added to a three-necked flask, and polyacrylamide was slowly added until it was completely dissolved; the temperature of the No. 2 reactor was raised to 85°C, 500g of deionized water was added to the three-necked flask, and then xanthan gum was slowly added, and after it was completely dissolved, it was poured into the three-necked flask of the No. 1 reactor and mixed evenly; the temperature of the No. 1 reactor was adjusted to 85°C, acrylic acid was used as additive A, sodium hydroxide was dissolved in 86g of water and stirred to dissolve to prepare additive B, and additives A and B were slowly added dropwise to the three-necked flask of the No. 1 reactor at the same time; after the reaction lasted for 5 minutes, ammonium persulfate and N,N'-methylenebisacrylamide were added; after the reaction lasted for 2 hours, sodium dodecylbenzene sulfonate and dodecyl alcohol ester were added, and after they were dissolved, they were removed from the pot to obtain a hydrogel dust suppressant.

[0058] Example 5

[0059] Preparation of hydrogel dust suppressant:

[0060] (1) Components

[0061] Polyvinyl alcohol 10g, dodecyl alcohol ester 3g, xanthan gum 10g, acrylic acid 220g, sodium hydroxide 37g, N,N'-methylenebisacrylamide 4.5g, ammonium persulfate 3g, sodium dodecylbenzene sulfonate 10g;

[0062] Among them, polyvinyl alcohol is a film-forming agent; dodecyl alcohol ester is a film-forming aid; xanthan gum is a thickener; acrylic acid is a functional monomer; sodium hydroxide is a neutralizer; N,N'-methylenebisacrylamide is a cross-linking agent; ammonium persulfate is an initiator; and sodium dodecylbenzene sulfonate is a surfactant.

[0063] (2) Preparation method

[0064] The temperature of the No. 1 reactor was raised to 98°C, 500g of deionized water was added to a three-necked flask, and polyvinyl alcohol was slowly added until it was completely dissolved; the temperature of the No. 2 reactor was raised to 85°C, 500g of deionized water was added to the three-necked flask, and then xanthan gum was slowly added, and after it was completely dissolved, it was poured into the three-necked flask of the No. 1 reactor and mixed evenly; the temperature of the No. 1 reactor was adjusted to 85°C, acrylic acid was used as additive A, sodium hydroxide was dissolved in 86g of water and stirred to dissolve to prepare additive B, and additives A and B were slowly added dropwise to the three-necked flask of the No. 1 reactor at the same time; after the reaction lasted for 5 minutes, ammonium persulfate and N,N'-methylenebisacrylamide were added; after the reaction lasted for 2 hours, sodium dodecylbenzenesulfonate and dodecyl alcohol ester were added, and after they were dissolved, they were removed from the pot to obtain a hydrogel dust suppressant.

[0065] 1. Dust suppression effect test

[0066] The hydrogel dust suppressant prepared in Examples 1 to 5 was diluted at a ratio of dust suppressant: water = 1:500 (diluted 500 times) and then subjected to performance testing, wherein the wind erosion rate and the thickness of the solidified layer were tested according to the TB / T3210.1-2020 test method, and the specific steps were as follows:

[0067] Place the 10-30 mesh coal sample in an oven and bake it at (50±2)℃ for 5 hours to remove moisture, then place it at room temperature for 1 hour; place a 300mm×210mm×30mm solid and non-deformable tray at room temperature for 1 hour and weigh it. The mass of the tray is w. Place the baked coal sample in the tray so that the coal seam surface is flush with the tray; spray ≥2.2L / m 2 The dust suppressant solution is placed at room temperature for 2 hours. Then it is placed in an oven. Bake at (50 ± 2) ℃ for 2 hours. Before blowing, the test sample is weighed first, and the mass of the coal and the tray is w1. After weighing, the test sample is placed in a duct with a cross-sectional size of 300mm×300mm and blown for 5 minutes. After blowing, the test sample is taken out and weighed again. The mass of the coal and the tray after blowing is w2.

[0068] The wind erosion rate is the percentage of the mass loss of the sample after erosion to the mass before erosion; in each test sample after erosion, four solidified layers are randomly selected, and their thickness is measured, and the arithmetic average is taken as the test result. The solidified layer is formed by spraying dust suppressant on the surface of coal, and the dust suppressant penetrates evenly. During the evaporation process, the large and small particles on the surface of the coal are bonded together to form a solidified layer with a certain thickness, strength and toughness.

[0069] The coal sample was dried and tested with a hardness tester. According to the instrument test requirements, the surface of the sample to be tested was pressed flat until the data was recorded when the surface cracks were observed. According to the instrument operating procedures, six different positions were randomly selected to test the film strength of the sample, and the film strength was determined by sorting them according to the size of the arithmetic mean.

[0070] The test results are shown in Table 1:

[0071] Table 1 Dust suppression effect test

[0072]

[0073] As can be seen from Table 1, the wind erosion rate and solidified layer thickness of the dust suppressants for coal storage prepared in Examples 1-4 of the present application meet the requirements of the specification TB / T3210.1-2020, which shows that the dust suppressants for coal storage prepared in the present invention have good film-forming properties and good dust suppression effects. The dust suppressant for coal transportation prepared in Example 5 has a reduced amount of surfactant, which reduces the permeability of the dust suppressant, and the wind erosion rate and solidified layer thickness are also slightly reduced.

[0074] The synthesis principle of the hydrogel dust suppressant of the present invention is as follows: the flexible molecule (polyvinyl alcohol) stretches at high temperature and is evenly dispersed in the solution. After mixing with the thickener, the flexible polymer (polyvinyl alcohol) chain diffuses into the structural polymer (xanthan gum). A large number of -OH groups in the chemical structures of the two polymers interact with each other through hydrogen bonds, thereby forming a first-layer network structure. Finally, the functional monomer is added and evenly dispersed in the first-layer network structure. The added initiator decomposes into free radicals, which initiate the polymerization of the functional monomers. The monomers continue to grow during the reaction and penetrate the first-layer network in turn. At the same time, the -COOH and -OH groups interact with each other to form a second-layer network structure. The synthesis principle is as follows: Figure 1 shown.

[0075] The hydrogel dust suppressant prepared by the present invention is different from conventional hydrogels. Conventional hydrogels are single-network hydrogels with high viscoelasticity and good water retention, but they have problems such as poor mechanical properties and uneven network distribution. They are prone to breakage under low stress or strain conditions. The hydrogel prepared by the present invention is an interpenetrating network hydrogel. When the first network breaks, many small clusters will be generated, which will serve as sacrificial bonds to dissipate energy to prevent the cracks from continuing to expand. They are also used as crosslinking points when the second network slides, ensuring the mechanical strength and tensile properties of the hydrogel. At the same time, it has good biocompatibility and environmental friendliness. Its tensile properties are as follows: Figure 2 When the first network breaks, many small clusters are generated, which act as sacrificial bonds to dissipate energy and prevent the crack from continuing to expand. They are also used as cross-linking points when the second network slides, ensuring the mechanical strength and tensile properties of the hydrogel.

[0076] In the present invention, the dust suppression principle of the hydrogel dust suppressant is as follows Figure 3 As shown in the figure, after the dust suppressant is sprayed on the coal dust, the dust suppressant collides with the coal dust, ensuring the wettability, permeability and adhesion between the coal dust particles. The surfactant contained in the dust suppressant system enhances the hydrophilicity and wettability of the surface of the coal dust particles, so that the dust suppressant can penetrate and fill the gaps between the coal dust particles. At the same time, the dust suppressant can combine with the coal dust particles to agglomerate the coal dust particles, thereby solidifying the coal dust. Due to the heat absorption of the outside air, the moisture absorbed by the surface of the coal dust gradually evaporates, but the formed solidified layer can retain a certain amount of moisture, prevent the dry solidified layer from cracking, reduce the moisture evaporation rate, and enhance the dust suppression effect.

[0077] The above is only a preferred embodiment of the present invention, and does not limit the present invention in other forms. Any technician familiar with the profession may use the above disclosed technical content to change or modify it into an equivalent embodiment with equivalent changes. However, any simple modification, equivalent change and modification made to the above embodiment according to the technical essence of the present invention without departing from the technical solution of the present invention still belongs to the protection scope of the technical solution of the present invention.

Claims

1. A hydrogel dust suppressant for coal storage and use, characterized in that: Contains the following components by mass: 1 to 20 parts of film-forming agent, 0.5 to 5 parts of film-forming aid, 0.5 to 15 parts of thickener, 100 to 300 parts of functional monomer, 20 to 50 parts of neutralizer, 0.5 to 5 parts of cross-linking agent, 0.5 to 5 parts of initiator, and 3 to 30 parts of surfactant.

2. The hydrogel dust suppressant for coal storage and use according to claim 1, characterized in that: Contains the following components by mass: 15 parts of film former, 3 parts of film-forming aid, 10 parts of thickener, 220 parts of functional monomer, 37 parts of neutralizer, 4.5 parts of cross-linking agent, 3 parts of initiator, and 20 parts of surfactant.

3. The hydrogel dust suppressant for coal storage and use according to claim 1, characterized in that: The film-forming agent is one or more of polyvinyl alcohol, polyacrylamide, hyaluronic acid, and agar; and / or, The film-forming aid is one or more of ethylene glycol, propylene glycol, hexylene glycol, dodecyl alcohol ester, propylene glycol ethyl ether, ethylene glycol butyl ether, and propylene glycol butyl ether; and / or, The thickener is one or more of sodium carboxymethyl starch, methyl cellulose, hydroxymethyl cellulose, and xanthan gum; and / or, The functional monomer is one or both of acrylic acid and acrylamide; and / or, The neutralizing agent is one or more of calcium hydroxide, sodium hydroxide, potassium hydroxide, sodium bicarbonate, sodium carbonate, ethanolamine, and ethylenediamine; and / or, The cross-linking agent is one or more of N,N'-methylenebisacrylamide, diallylpyridine and diallylbenzene; and / or, The initiator is one or more of ammonium persulfate, potassium persulfate, and sodium persulfate; and / or, The surfactant is one or more of potassium oleate, sodium oleate, sodium ricinoleate, sodium stearate, sodium lauryl sulfate, sodium lignin sulfonate, fatty alcohol polyoxyethylene ether, polyoxyethylene amide, fatty acid potassium and sodium, sodium dodecyl sulfate, sodium dodecylbenzene sulfonate, nonyl polyoxyethylene ether, and perfluorinated surfactant.

4. The method for preparing the hydrogel dust suppressant for coal storage and use according to any one of claims 1 to 3, characterized in that: Here are the steps: The film-forming agent solution and the thickener solution are mixed, the reaction temperature is maintained at 80-100°C, and then the functional monomer and the neutralizer solution are added; after the reaction is allowed to proceed for 2-10 minutes, the initiator and the cross-linking agent are added; after the reaction is allowed to proceed for 1-3 hours, the surfactant and the film-forming aid are added, and after they are dissolved and mixed evenly, a hydrogel dust suppressant is obtained.

5. The preparation method according to claim 4, characterized in that: The mass concentration of the film former solution is selected from 1 to 3%; and / or, the mass concentration of the thickener solution is selected from 1 to 3%; and / or, the mass concentration of the neutralizer solution is selected from 10 to 40%.

6. Use of the hydrogel dust suppressant for coal storage and transportation according to any one of claims 1 to 3 in dust suppression for coal storage and transportation.

7. A method for suppressing dust during coal storage and transportation, characterized in that: Here are the steps: The hydrogel dust suppressant according to any one of claims 1 to 3 is diluted in water at a mass ratio of 1:50 to 500, and then the mixture is stirred at a temperature of 2.2 to 3.5 L / m 2 The diluted hydrogel dust suppressant liquid is sprayed on the coal surface with a spraying amount to achieve the dust suppression effect during coal storage and transportation.

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