Multifunctional environment-friendly dust suppressant and preparation method thereof

Abstract

The invention provides a multifunctional environment-friendly dust suppressant and a preparation method thereof, and relates to the field of dust control. The coating comprises a solution A and a solution B. The solution A comprises the following raw materials in percentage by mass: 5-10% of polyether polyol, 3-5% of isocyanate, 5-10% of carboxymethyl cellulose, 1-5% of a nonionic surfactant, 1-2% of a humectant, 1-2% of a film-forming agent, 1-2% of bentonite and the balance of water. The solution B is prepared from the following raw materials in percentage by mass: 1 to 3 percent of 2-amino-fluorobenzylamine, 0.5 to 1 percent of bismuth isooctoate, 5 to 10 percent of modified starch, 1 to 5 percent of polyvinyl alcohol and the balance of water. The polyether polyol and the isocyanate in the raw materials can form a polyurethane curing layer under the action of the catalyst, and hydroxyl groups in the modified starch and the polyvinyl alcohol in the raw materials can participate in the reaction of polyurethane to form the polyurethane curing layer with a three-dimensional network structure, so that the strength of the curing layer is improved.

Description

Technical Field

[0001] The present invention relates to the field of dust control, and in particular to a multifunctional environmentally friendly dust suppressant and a preparation method thereof. Background Art

[0002] During coal transportation, train turbulence and wind can cause dust on the coal surface to scatter or rise, causing coal loss and environmental pollution along the way. This can also pose a threat to equipment and railway transportation safety. Currently, the main methods for suppressing dust during coal transportation include adding protective nets, enclosing carriages, sprinkling water, and spraying dust suppressants. Among them, adding protective nets is a physical dust control method that can be used in conjunction with the other two dust control methods. Sprinkling water works by soaking the surface of the coal with water, causing fine dust particles to clump together under the action of water, thereby reducing dust. Spraying dust suppressants uses the dust suppressant's adsorption, hygroscopicity, and crusting properties to form a highly adhesive, solidified layer on the coal surface, preventing dust from escaping.

[0003] Polymer dust suppressants are a type of chemical dust suppressant that is currently widely used, such as natural polymer dust suppressants, polymer dust suppressants, inorganic-organic composite polymer dust suppressants, etc., which achieve high-efficiency dust suppression through bonding, film formation, moisture absorption and other mechanisms; however, polymer dust suppressants still have the disadvantages of low resistance to rolling and wind erosion of the solidified layer, poor waterproof performance, water absorption and swelling of the solidified layer, and serious shortening of dust suppression failure; poor high temperature resistance, shortened solution evaporation time, resulting in uneven crusting, and decreased wind erosion resistance. Summary of the Invention

[0004] The object of the present invention is to provide a multifunctional environmentally friendly dust suppressant with good dust suppression effect, high strength of the cured layer and good waterproofness.

[0005] Another object of the present invention is to provide a method for preparing a multifunctional environmentally friendly dust suppressant, which has a simple preparation method and uniform dispersion of the raw materials.

[0006] The present invention solves the technical problem by adopting the following technical solutions.

[0007] In one aspect, an embodiment of the present invention provides a multifunctional environmentally friendly dust suppressant, comprising a solution A and a solution B, wherein the solution A comprises the following raw materials by mass percentage:

[0008] Polyether polyol 5-10%, isocyanate 3-5%, carboxymethyl cellulose 5-10%, nonionic surfactant 1-5%, humectant 1-2%, film-forming agent 1-2%, bentonite 1-2%, and the balance is water;

[0009] The solution B comprises the following raw materials by mass percentage:

[0010] 2-amino-fluorobenzylamine 1-3%, bismuth isooctanoate 0.5-1%, modified starch 5-10%, polyvinyl alcohol 1-5%, and the balance is water.

[0011] In some embodiments of the present invention, the moisturizing agent is a mixture of glycerol and sorbitol, and the mass ratio of the two is (3-3.5): (0.5-1).

[0012] In some embodiments of the present invention, the film-forming agent is polyvinyl butyral, a silane coupling agent, and nano-silicon dioxide, and the mass ratio of the three is 1: (0.3-0.5): (0.1-0.3).

[0013] In some embodiments of the present invention, the nonionic surfactant is one of fatty alcohol polyoxyethylene ether, polyoxyethylene cetyl alcohol ether, octylphenol polyoxyethylene ether, and Tween 80.

[0014] In some embodiments of the present invention, the modified starch is prepared as follows:

[0015] The purified attapulgite is subjected to microwave activation treatment to obtain activated attapulgite;

[0016] The starch was modified by wet ball milling, then mixed evenly with water, heated and gelatinized, cooled to room temperature, and then acrylic acid was added. Ammonium persulfate was added under an inert atmosphere at 60-70°C, stirred and reacted for 3-4 hours, and cooled to room temperature;

[0017] Activated attapulgite is added, stirred evenly, and spray-dried to obtain the modified starch.

[0018] In some embodiments of the present invention, the molar ratio of attapulgite, starch and acrylic acid is (1-1.3): (1-1.5): (0.8-1).

[0019] In some embodiments of the present invention, the volume ratio of the solution A to the solution B is (0.8-1):(1-1.2).

[0020] On the other hand, an embodiment of the present invention provides a method for preparing a multifunctional environmentally friendly dust suppressant, comprising the following steps:

[0021] S1, mixing polyether polyol, isocyanate, carboxymethyl cellulose, nonionic surfactant and water, then adding humectant, film-forming agent and bentonite, and mixing well to prepare solution A;

[0022] S2, 2-amino-fluorobenzylamine, bismuth isooctanoate and water are mixed evenly, and then modified starch and polyvinyl alcohol are added and mixed evenly to prepare solution B;

[0023] S3, ultrasonically treating solution A and solution B, and stirring them evenly to obtain the dust suppressant.

[0024] In some embodiments of the present invention, in step S3, the frequency of ultrasonic treatment is 50-60 kHz, and the treatment time is 30-60 s.

[0025] In some embodiments of the present invention, in step S3, the stirring rate is 150-200 rpm.

[0026] Compared with the prior art, the embodiments of the present invention have at least the following advantages or beneficial effects:

[0027] The multifunctional environmentally friendly dust suppressant provided by the present invention can form a polyurethane solidified layer in the polyether polyol and isocyanate in the raw materials under the action of a catalyst, and the hydroxyl groups in the modified starch and polyvinyl alcohol in the raw materials can participate in the reaction of the polyurethane to form a polyurethane solidified layer with a three-dimensional network structure, thereby improving the strength of the solidified layer. DETAILED DESCRIPTION

[0028] To make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are described clearly and completely below. Where specific conditions are not specified in the embodiments, conventional conditions or conditions recommended by the manufacturer are used. Where the manufacturer of the reagents or instruments is not specified, all are conventional products that can be purchased commercially.

[0029] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to specific embodiments.

[0030] In one aspect, an embodiment of the present invention provides a multifunctional environmentally friendly dust suppressant, comprising solution A and solution B, wherein the volume ratio of solution A to solution B is (0.8-1):(1-1.2). Solution A comprises the following raw materials by mass percentage:

[0031] Polyether polyol 5-10%, isocyanate 3-5%, carboxymethyl cellulose 5-10%, nonionic surfactant 1-5%, humectant 1-2%, film-forming agent 1-2%, bentonite 1-2%, and the balance is water;

[0032] The solution B comprises the following raw materials by mass percentage:

[0033] 2-amino-fluorobenzylamine 1-3%, bismuth isooctanoate 0.5-1%, modified starch 5-10%, polyvinyl alcohol 1-5%, and the balance is water.

[0034] The moisturizing agent is a mixture of glycerin and sorbitol, with a mass ratio of (3-3.5): (0.5-1). The film-forming agent is polyvinyl butyral, a silane coupling agent, and nano-silica, with a mass ratio of 1: (0.3-0.5): (0.1-0.3). The nonionic surfactant is one of fatty alcohol polyoxyethylene ether, polyoxyethylene cetyl alcohol ether, octylphenol polyoxyethylene ether, and Tween 80.

[0035] The modified starch is prepared as follows:

[0036] The purified attapulgite is microwave-activated to obtain activated attapulgite; starch is wet-ball-milled and then mixed with water, heated to gelatinize, cooled to room temperature, and then acrylic acid is added. Ammonium persulfate is added under an inert atmosphere at 60-70°C, stirred for 3-4 hours, and cooled to room temperature; the activated attapulgite is added, stirred evenly, and spray-dried to obtain the modified starch. The molar ratio of the attapulgite, starch, and acrylic acid is (1-1.3):(1-1.5):(0.8-1).

[0037] By grafting modified starch with acrylic acid, acrylic acid molecules are grafted onto the starch molecules to increase their hydrophobicity. This is then mixed with attapulgite, which is then used to coat the starch. During use, the attapulgite on the surface of the modified starch and the hydrophobic starch within it have a low initial viscosity in water and good permeability, allowing them to penetrate into the coal within a short period of time. As the attapulgite absorbs water, it reacts with the starch to form a colloidal solution in water, increasing its viscosity. The polyether polyol and isocyanate in the inhibitor, under the action of a catalyst, form a polyurethane cured layer. The starch and polyvinyl alcohol that penetrate into the interior enter the three-dimensional network structure of the polyurethane molecules, forming a cured layer both on the surface and within the coal layer. This cured layer is thick and strong. Secondly, the modified starch is grafted with acrylic hydrophobic groups, which increase the hydrophobicity of the cured layer, thereby improving its water resistance and waterproofness, making it less susceptible to water absorption and swelling.

[0038] Furthermore, adding polyvinyl alcohol, moisturizer and bentonite to the inhibitor has a certain water-retaining effect. It can slow down the evaporation of water in the solution and prolong the evaporation time of water, so that the dust suppressant can penetrate downward evenly, improve the bonding uniformity and enhance the strength of the solidified layer.

[0039] On the other hand, an embodiment of the present invention provides a method for preparing a multifunctional environmentally friendly dust suppressant, comprising the following steps:

[0040] S1, mixing polyether polyol, isocyanate, carboxymethyl cellulose, nonionic surfactant and water, then adding humectant, film-forming agent and bentonite, and mixing well to prepare solution A;

[0041] S2, 2-amino-fluorobenzylamine, bismuth isooctanoate and water are mixed evenly, and then modified starch and polyvinyl alcohol are added and mixed evenly to prepare solution B;

[0042] S3, ultrasonically treating solution A and solution B, and stirring them evenly to obtain the dust suppressant.

[0043] The frequency of ultrasonic treatment is 50-60 kHz, the treatment time is 30-60 s, and the stirring rate is 150-200 rpm.

[0044] It should be noted that when using the dust suppressant of the embodiment of the present invention, it can be prepared and used immediately, and solution A and solution B can be stirred and mixed evenly, and then sprayed on the surface of the coal layer in batches.

[0045] The features and performance of the present invention are further described in detail below with reference to the embodiments.

[0046] Example 1

[0047] 1. Prepare the modified starch of this embodiment as follows:

[0048] The purified attapulgite is subjected to microwave activation treatment to obtain activated attapulgite; the starch is modified by wet ball milling, then mixed evenly with water, heated for gelatinization, cooled to room temperature, and then acrylic acid is added. In an inert atmosphere, ammonium persulfate is added at 60°C, the mixture is stirred for reaction for 4 hours, and cooled to room temperature; the activated attapulgite is added, the mixture is stirred evenly, and the mixture is spray-dried to obtain the modified starch.

[0049] The molar ratio of attapulgite, starch and acrylic acid is 1:1:0.8.

[0050] 2. Prepare the raw materials for solution A and solution B according to the following ratio:

[0051] Solution A: polyether polyol 10%, isocyanate 5%, carboxymethyl cellulose 10%, nonionic surfactant 5%, humectant 2%, film-forming agent 2%, bentonite 2%, and the balance is water;

[0052] Solution B: 3% 2-amino-fluorobenzylamine, 1% bismuth isooctanoate, 10% modified starch, 5% polyvinyl alcohol, and the balance is water.

[0053] 3. Prepare the dust suppressant of this embodiment as follows:

[0054] S1, mixing polyether polyol, isocyanate, carboxymethyl cellulose, nonionic surfactant and water, then adding humectant, film-forming agent and bentonite, and mixing well to prepare solution A;

[0055] S2, 2-amino-fluorobenzylamine, bismuth isooctanoate and water are mixed evenly, and then modified starch and polyvinyl alcohol are added and mixed evenly to prepare solution B;

[0056] S3, subjecting solution A and solution B to ultrasonic treatment at a frequency of 60 kHz and a treatment time of 30 s; and then stirring them uniformly at a stirring rate of 200 rpm to obtain the dust suppressant.

[0057] Example 2

[0058] 1. Prepare the modified starch of this embodiment as follows:

[0059] The purified attapulgite is subjected to microwave activation treatment to obtain activated attapulgite; the starch is modified by wet ball milling, then mixed evenly with water, heated for gelatinization, cooled to room temperature, and then acrylic acid is added. In an inert atmosphere, ammonium persulfate is added at 70°C, the mixture is stirred for reaction for 4 hours, and cooled to room temperature; the activated attapulgite is added, stirred evenly, and spray-dried to obtain the modified starch.

[0060] The molar ratio of attapulgite, starch and acrylic acid is 1:1:0.8.

[0061] 2. Prepare the raw materials for solution A and solution B according to the following ratio:

[0062] Solution A: polyether polyol 5%, isocyanate 3%, carboxymethyl cellulose 10%, nonionic surfactant 5%, humectant 2%, film-forming agent 2%, bentonite 2%, and the balance is water;

[0063] Solution B: 3% 2-amino-fluorobenzylamine, 1% bismuth isooctanoate, 10% modified starch, 1% polyvinyl alcohol, and the balance is water.

[0064] 3. Prepare the dust suppressant of this embodiment as follows:

[0065] S1, mixing polyether polyol, isocyanate, carboxymethyl cellulose, nonionic surfactant and water, then adding humectant, film-forming agent and bentonite, and mixing well to prepare solution A;

[0066] S2, 2-amino-fluorobenzylamine, bismuth isooctanoate and water are mixed evenly, and then modified starch and polyvinyl alcohol are added and mixed evenly to prepare solution B;

[0067] S3, subjecting solution A and solution B to ultrasonic treatment at a frequency of 60 kHz and a treatment time of 30 s; and then stirring them uniformly at a stirring rate of 200 rpm to obtain the dust suppressant.

[0068] Example 3

[0069] 1. Prepare the modified starch of this embodiment as follows:

[0070] The purified attapulgite is subjected to microwave activation treatment to obtain activated attapulgite; the starch is modified by wet ball milling, then mixed evenly with water, heated for gelatinization, cooled to room temperature, and then acrylic acid is added. In an inert atmosphere, ammonium persulfate is added at 70°C, the mixture is stirred for reaction for 4 hours, and cooled to room temperature; the activated attapulgite is added, stirred evenly, and spray-dried to obtain the modified starch.

[0071] The molar ratio of attapulgite, starch and acrylic acid is 1.3:1.5:1.

[0072] 2. Prepare the raw materials for solution A and solution B according to the following ratio:

[0073] Solution A: 8% polyether polyol, 5% isocyanate, 8% carboxymethyl cellulose, 1% nonionic surfactant, 1% humectant, 1% film-forming agent, 1% bentonite, and the balance is water;

[0074] Solution B: 3% 2-amino-fluorobenzylamine, 0.5% bismuth isooctanoate, 5% modified starch, 1% polyvinyl alcohol, and the balance is water.

[0075] 3. Prepare the dust suppressant of this embodiment as follows:

[0076] S1, mixing polyether polyol, isocyanate, carboxymethyl cellulose, nonionic surfactant and water, then adding humectant, film-forming agent and bentonite, and mixing well to prepare solution A;

[0077] S2, 2-amino-fluorobenzylamine, bismuth isooctanoate and water are mixed evenly, and then modified starch and polyvinyl alcohol are added and mixed evenly to prepare solution B;

[0078] S3, subjecting solution A and solution B to ultrasonic treatment at a frequency of 60 kHz and a treatment time of 30 s; and then stirring them uniformly at a stirring rate of 200 rpm to obtain the dust suppressant.

[0079] Example 4

[0080] 1. Prepare the modified starch of this embodiment as follows:

[0081] The purified attapulgite is subjected to microwave activation treatment to obtain activated attapulgite; the starch is modified by wet ball milling, then mixed evenly with water, heated for gelatinization, cooled to room temperature, and then acrylic acid is added. In an inert atmosphere, ammonium persulfate is added at 70°C, the mixture is stirred for reaction for 4 hours, and cooled to room temperature; the activated attapulgite is added, stirred evenly, and spray-dried to obtain the modified starch.

[0082] The molar ratio of attapulgite, starch and acrylic acid is 1:1.2:1.

[0083] 2. Prepare the raw materials for solution A and solution B according to the following ratio:

[0084] Solution A: polyether polyol 10%, isocyanate 5%, carboxymethyl cellulose 10%, nonionic surfactant 5%, humectant 2%, film-forming agent 2%, bentonite 2%, and the balance is water;

[0085] Solution B: 3% 2-amino-fluorobenzylamine, 1% bismuth isooctanoate, 10% modified starch, 5% polyvinyl alcohol, and the balance is water.

[0086] 3. Prepare the dust suppressant of this embodiment as follows:

[0087] S1, mixing polyether polyol, isocyanate, carboxymethyl cellulose, nonionic surfactant and water, then adding humectant, film-forming agent and bentonite, and mixing well to prepare solution A;

[0088] S2, 2-amino-fluorobenzylamine, bismuth isooctanoate and water are mixed evenly, and then modified starch and polyvinyl alcohol are added and mixed evenly to prepare solution B;

[0089] S3, subjecting solution A and solution B to ultrasonic treatment at a frequency of 50 kHz and a treatment time of 60 s; and then stirring them uniformly at a stirring rate of 200 rpm to obtain the dust suppressant.

[0090] Example 5

[0091] 1. Prepare the modified starch of this embodiment as follows:

[0092] The purified attapulgite is subjected to microwave activation treatment to obtain activated attapulgite; the starch is modified by wet ball milling, then mixed evenly with water, heated for gelatinization, cooled to room temperature, and then acrylic acid is added. In an inert atmosphere, ammonium persulfate is added at 70°C, the mixture is stirred for reaction for 4 hours, and cooled to room temperature; the activated attapulgite is added, stirred evenly, and spray-dried to obtain the modified starch.

[0093] The molar ratio of attapulgite, starch and acrylic acid is 1.3:1.5:0.8.

[0094] 2. Prepare the raw materials for solution A and solution B according to the following ratio:

[0095] Solution A: 8% polyether polyol, 3% isocyanate, 8% carboxymethyl cellulose, 3% nonionic surfactant, 1% humectant, 1% film-forming agent, 1% bentonite, and the balance is water;

[0096] Solution B: 2% 2-amino-fluorobenzylamine, 0.5% bismuth isooctanoate, 8% modified starch, 3% polyvinyl alcohol, and the balance is water.

[0097] 3. Prepare the dust suppressant of this embodiment as follows:

[0098] S1, mixing polyether polyol, isocyanate, carboxymethyl cellulose, nonionic surfactant and water, then adding humectant, film-forming agent and bentonite, and mixing well to prepare solution A;

[0099] S2, 2-amino-fluorobenzylamine, bismuth isooctanoate and water are mixed evenly, and then modified starch and polyvinyl alcohol are added and mixed evenly to prepare solution B;

[0100] S3, subjecting solution A and solution B to ultrasonic treatment at a frequency of 50 kHz and a treatment time of 60 s; and then stirring them uniformly at a stirring rate of 200 rpm to obtain the dust suppressant.

[0101] Comparative Example 1

[0102] The difference from Example 1 is that no modified starch is added, and the remaining raw materials and preparation method are the same as those of Example 1.

[0103] Comparative Example 2

[0104] The difference from Example 1 is that no polyethanol is added, and the remaining raw materials and preparation method are the same as those of Example 1.

[0105] Comparative Example 3

[0106] The difference from Example 1 is that modified starch and polyethanol are not added, and the remaining raw materials and preparation methods are the same as those of Example 1.

[0107] Experimental example

[0108] Coal powder and dust suppressant were mixed in a ratio of 1:1 and spread evenly in a culture dish with a diameter of 5 cm. The height of the mixture was 5 cm. The thickness and strength of the crust were tested after 7 days. The results are shown in Table 1.

[0109] A wind speed of 15 m / s was simulated in a laboratory wind tunnel, and the dust concentration before and after spraying the dust suppressant was measured using a dust concentration detector. The dust fall rate was calculated; the results are shown in Table 1.

[0110] Coal powder and dust suppressant were mixed in a ratio of 1:1, spread evenly in a culture dish with a diameter of 5 cm, and weighed. The culture dish was placed in a laboratory wind tunnel to simulate a wind speed of 15 m / s and continued to blow air for 10 minutes. Then it was weighed and the wind erosion rate was calculated. The results are shown in Table 1.

[0111] Table 1 Performance of each dust suppressant

[0112]

[0113]

[0114] It can be concluded from Table 1 that the dust suppressants of Examples 1-5 have good dust suppression effect, high crust strength and good wind erosion resistance.

[0115] In summary, the multifunctional environmentally friendly dust suppressant provided by the embodiment of the present invention, the polyether polyol and isocyanate in its raw materials can form a polyurethane cured layer under the action of a catalyst, and the hydroxyl groups in the modified starch and polyvinyl alcohol in the raw materials can participate in the reaction of the polyurethane to form a three-dimensional network structure of the polyurethane cured layer, thereby improving the strength of the cured layer.

[0116] The embodiments described above are some, but not all, of the embodiments of the present invention. The detailed description of the embodiments of the present invention is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are also within the scope of protection of the present invention.

Claims

1. A multifunctional environmentally friendly dust suppressant, characterized in that: Including solution A and solution B, The solution A comprises the following raw materials by mass percentage: Polyether polyol 5-10%, isocyanate 3-5%, carboxymethyl cellulose 5-10%, nonionic surfactant 1-5%, humectant 1-2%, film-forming agent 1-2%, bentonite 1-2%, and the balance is water; The solution B comprises the following raw materials by mass percentage: 2-amino-fluorobenzylamine 1-3%, bismuth isooctanoate 0.5-1%, modified starch 5-10%, polyvinyl alcohol 1-5%, and the balance is water.

2. The multifunctional environmentally friendly dust suppressant according to claim 1, characterized in that: The moisturizing agent is a mixture of glycerin and sorbitol, and the mass ratio of the two is (3-3.5): (0.5-1).

3. The multifunctional environmentally friendly dust suppressant according to claim 1, characterized in that: The film-forming agent is polyvinyl butyral, a silane coupling agent and nano silicon dioxide, and the mass ratio of the three is 1: (0.3-0.5): (0.1-0.3).

4. The multifunctional environmentally friendly dust suppressant according to claim 1, characterized in that: The nonionic surfactant is one of fatty alcohol polyoxyethylene ether, polyoxyethylene cetyl alcohol ether, octylphenol polyoxyethylene ether, and Tween 80.

5. The multifunctional environmentally friendly dust suppressant according to claim 1, characterized in that: The modified starch is prepared as follows: The purified attapulgite is subjected to microwave activation treatment to obtain activated attapulgite; The starch was modified by wet ball milling, then mixed evenly with water, heated and gelatinized, cooled to room temperature, and then acrylic acid was added. Ammonium persulfate was added under an inert atmosphere at 60-70°C, stirred and reacted for 3-4 hours, and cooled to room temperature; Activated attapulgite is added, stirred evenly, and spray-dried to obtain the modified starch.

6. The multifunctional environmentally friendly dust suppressant according to claim 5, characterized in that: The molar ratio of the attapulgite, starch and acrylic acid is (1-1.3): (1-1.5): (0.8-1).

7. The multifunctional environmentally friendly dust suppressant according to claim 1, characterized in that: The volume ratio of the solution A to the solution B is (0.8-1):(1-1.2).

8. A method for preparing the multifunctional environmentally friendly dust suppressant according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1, mixing polyether polyol, isocyanate, carboxymethyl cellulose, nonionic surfactant and water, then adding humectant, film-forming agent and bentonite, and mixing well to prepare solution A; S2, 2-amino-fluorobenzylamine, bismuth isooctanoate and water are mixed evenly, and then modified starch and polyvinyl alcohol are added and mixed evenly to prepare solution B; S3, ultrasonically treating solution A and solution B, and stirring them evenly to obtain the dust suppressant.

9. The method for preparing the multifunctional environmentally friendly dust suppressant according to claim 1, characterized in that: In step S3, the frequency of ultrasonic treatment is 50-60 kHz, and the treatment time is 30-60 s.

10. The method for preparing the multifunctional environmentally friendly dust suppressant according to claim 1, characterized in that: In step S3, the stirring rate is 150-200 rpm.

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