Waterproof dust suppressant for coal and preparation method thereof

Abstract

This invention discloses a waterproof dust suppressant for coal and its preparation method. The method includes the following steps: Step 1: Dispersing sodium alginate and sodium carboxymethyl cellulose in deionized water, stirring in a 50°C water bath, adding ammonium persulfate, followed by modified silica, N,N'-methylenebisacrylamide, and acrylamide, and reacting at elevated temperature to obtain a copolymer solution; Step 2: Mixing the copolymer solution, sodium dodecylbenzenesulfonate, and carboxymethyl chitosan to obtain the waterproof dust suppressant. Beneficial effects: This invention chemically modifies silica, introducing active groups onto its surface, significantly enhancing the crosslinking effect between silica and polymer materials, thereby improving the mechanical strength and density of the cured dust suppressant layer; furthermore, the introduction of hydrophobic groups enhances its waterproof performance. Simultaneously, the modified silica and carboxymethyl chitosan and other components synergistically improve the dust suppressant's resistance to wind erosion and water erosion.

Description

Technical Field

[0001] This invention belongs to the field of dust suppressant technology, specifically relating to a waterproof dust suppressant for coal and its preparation method. Background Technology

[0002] During coal mining, transportation, and storage, coal dust is easily generated by wind or mechanical action, resulting in resource waste, severe environmental pollution, and harm to human health. Currently, commonly used dust suppression technologies include water spraying, covering with dust nets, or spraying chemical dust suppressants. Among these, chemical dust suppressants have received widespread attention due to their ease of use and long-lasting effects.

[0003] However, existing dust suppressants still have many shortcomings: First, traditional dust suppressants (such as ordinary polymer emulsions or surfactants) have poor water resistance, easily dissolving or being washed away by water, making them unsuitable for humid or rainy environments such as open-air coal yards; second, physically adsorbent dust suppressants (such as silica or clay) have weak bonding with coal dust, insufficient resistance to wind erosion, and are prone to falling off due to wind action after long-term use; in addition, some dust suppressants rely on high-cost raw materials (such as organosilicon or fluorocarbons), making them uneconomical and difficult to promote on a large scale. More importantly, in existing technologies, nanomaterials such as silica often have difficulty forming stable cross-links with the polymer matrix due to their surface inertness, resulting in insufficient mechanical strength of the dust suppression layer, making it prone to cracking or peeling.

[0004] Therefore, in order to solve the above problems, the present invention provides a waterproof dust suppressant for coal and its preparation method. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a waterproof dust suppressant for coal and its preparation method.

[0006] The objective of this invention can be achieved through the following technical solutions:

[0007] A method for preparing a waterproof dust suppressant for coal includes the following steps:

[0008] Step 1: Disperse sodium alginate and sodium carboxymethyl cellulose in deionized water, stir in a 50°C water bath, add ammonium persulfate, then add modified silica, N,N'-methylenebisacrylamide, and acrylamide, raise the temperature to 60-70°C, react for 1-2 hours, cool to room temperature, and obtain the copolymer solution.

[0009] Step 2: Mix the copolymer solution, sodium dodecylbenzenesulfonate, and carboxymethyl chitosan to obtain a waterproof and dust-suppressing agent.

[0010] In a more optimized manner, the raw materials in the copolymer solution include the following components by weight: 2-3 parts sodium alginate, 0.3-0.5 parts sodium carboxymethyl cellulose, 100-120 parts deionized water, 0.1-0.3 parts ammonium persulfate, 1-2 parts modified silica, 2-4 parts acrylamide, and 0.03-0.06 parts N,N'-methylenebisacrylamide;

[0011] The raw materials for the waterproof and dust-suppressing agent include the following components: by weight, 100-120 parts copolymer solution, 0.1-0.5 parts sodium dodecylbenzenesulfonate, and 1-3 parts carboxymethyl chitosan.

[0012] In a more optimized manner, the preparation process of the modified silica is as follows:

[0013] S1: Mix nano-silica, toluene, and petroleum ether, raise the temperature to 90-100℃, reflux for 1-2 hours, then add dibutyltin laurate, add toluene diisocyanate dropwise under a protective atmosphere, react for 1-2 hours, centrifuge and filter, and vacuum dry to obtain isocyanate-modified silica.

[0014] S2: Under a protective atmosphere, 3,5-di-tert-butyl-4-hydroxyphenylpropionic acid, allyl glycine, triethylamine, N,N-diisopropylcarbodiimide, and anhydrous dichloromethane were mixed and reacted at room temperature for 3-4 hours. After the reaction was completed, the mixture was extracted with distilled water, the organic layer was taken, dried, filtered, and rotary evaporated to obtain intermediate A.

[0015] S3: Under a protective atmosphere, intermediate A was added to tetrahydrofuran and cooled to 0°C in an ice bath. Then, oxalyl chloride and N,N-dimethylformamide were slowly added dropwise. The mixture was gradually raised to room temperature and stirred for 2-4 hours. The solvent was removed by vacuum distillation. Subsequently, it was mixed with melamine, triethylamine, and dimethyl sulfoxide and stirred at 0°C for 1-2 hours. After the reaction was completed, the inorganic salts were removed by washing with water. The organic phase was dried, concentrated, and purified to obtain the modifier.

[0016] S4: Disperse isocyanated silica in dimethylformamide, add modifier and triethylamine, raise the temperature to 70-80℃, react for 1-3 hours, after the reaction is completed, cool to room temperature, filter, wash, and dry to obtain modified silica.

[0017] In this scheme, the surface of nano-silica contains a large number of hydroxyl groups (Si-OH), which react with the isocyanate groups (-NCO) of toluene diisocyanate (TDI) at high temperature (90-100℃) to generate urethane bonds. At the same time, this also makes the surface of nano-silica contain isocyanate groups.

[0018] In this scheme, 3,5-di-tert-butyl-4-hydroxyphenylpropionic acid (containing a carboxylic acid group) and allyl glycine (containing an amino group) undergo an amidation reaction under the action of a condensing agent (N,N-diisopropylcarbodiimide, DIC) and a base (triethylamine). The specific reaction process is shown below:

[0019]

[0020] In the process, the carboxylic acid group of intermediate A is converted to acyl chloride under the action of oxaloyl chloride (Cl-CO-CO-Cl) and a catalytic amount of DMF. Then, the acyl chloride reacts with the amino group of melamine at low temperature (0℃) to form an amide bond. The specific reaction process is shown below:

[0021]

[0022] In this scheme, the amino groups in the modifier react with the -NCO groups on the surface of isocyanate-modified silica to obtain modified silica.

[0023] More preferably, the isocyanate-modified silica raw material comprises the following components: by weight, 10-12 parts nano silica, 200-250 parts toluene, 100-150 parts petroleum ether, 0.5-1 parts dibutyltin laurylate, and 15-20 parts toluene diisocyanate.

[0024] More preferably, the intermediate A raw material comprises the following components by weight: 10-12 parts of 3,5-di-tert-butyl-4-hydroxyphenylpropionic acid, 6-7 parts of allyl glycine, 8-10 parts of triethylamine, 8-10 parts of N,N-diisopropylcarbodiimide, and 200-300 parts of anhydrous dichloromethane.

[0025] More preferably, the modifier raw material comprises the following components by weight: 10-12 parts intermediate A, 150-200 parts tetrahydrofuran, 15-20 parts oxaloyl chloride, 0.1-0.2 parts N,N-dimethylformamide, 3-4 parts melamine, 5-7 parts triethylamine, and 150-200 parts dimethyl sulfoxide.

[0026] In a more optimized manner, the modified silica raw material comprises the following components: by weight, 10-12 parts isocyanate-treated silica, 8-10 parts modifier, 0.5-1 part triethylamine, and 200-250 parts N,N-dimethylformamide.

[0027] The beneficial effects of this invention are:

[0028] This invention chemically modifies silica, introducing active groups onto its surface, significantly enhancing the crosslinking effect between silica and polymeric materials (such as sodium alginate and acrylamide). This modified silica, acting as a crosslinking agent, participates in the formation of copolymer networks, not only improving the mechanical strength and density of the cured dust suppressant layer but also enhancing its waterproof performance through the introduction of hydrophobic groups on its surface. Simultaneously, the modified silica synergistically works with components such as carboxymethyl chitosan to further improve the dust suppressant's resistance to wind erosion and water washout, as detailed below:

[0029] Firstly, the antioxidant groups (such as hindered phenolic structures) introduced on the surface of modified silica can capture free radicals, interrupt the oxidation chain reaction, and inhibit the degradation of polymer materials (such as sodium alginate and acrylamide copolymer) under high temperature, light, or ambient oxygen, thereby extending the service life of the dust suppressant curing layer. Furthermore, in outdoor environments, the antioxidant groups can resist photo-oxidation reactions caused by ultraviolet (UV) radiation, preventing the curing layer from becoming brittle or cracking due to long-term exposure to sunlight, ensuring the long-term effectiveness of the dust suppressant in scenarios such as open coal yards.

[0030] Secondly, the double bonds grafted onto the modified silica surface, under the action of ammonium persulfate initiator, can undergo free radical copolymerization with monomers such as acrylamide to form stable chemical crosslinking points. This covalent bonding firmly anchors the nano-silica within the polymer network, effectively avoiding the problems of uneven dispersion or particle migration caused by traditional physical adsorption.

[0031] The introduction of double bonds significantly enhances the interfacial bonding between silica and the polymer matrix. When the cured layer is subjected to external forces such as wind erosion and water scouring, stress can be efficiently transferred through the chemical bond network, reducing cracking or peeling caused by localized stress concentration. Furthermore, the long-chain hydrophobic groups such as lauric acid grafted onto the modified silica surface undergo directional migration during crosslinking, accumulating on the cured layer surface to form a dense hydrophobic barrier. This significantly reduces the contact area between water molecules and the cured layer by lowering surface energy. Simultaneously, the crosslinked network fixes coal powder particles through physical encapsulation, and combined with the chemical bonding mechanism involving double bonds, greatly enhances the interfacial adhesion strength between particles and the cured layer, thereby effectively suppressing secondary dust caused by wind disturbance or mechanical action. Detailed Implementation

[0032] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0033] Example 1: A method for preparing a waterproof dust suppressant for coal, comprising the following steps:

[0034] Step 1: Disperse 2 parts sodium alginate and 0.3 parts sodium carboxymethyl cellulose in 100 parts deionized water, stir in a 50°C water bath, add 0.1 parts ammonium persulfate, then add 1 part modified silica, 0.03 parts N,N'-methylenebisacrylamide, and 2 parts acrylamide, raise the temperature to 60°C, react for 1 hour, cool to room temperature, and obtain a copolymer solution;

[0035] Step 2: Mix 100 parts of copolymer solution, 0.1 parts of sodium dodecylbenzenesulfonate, and 1 part of carboxymethyl chitosan to obtain a waterproof and dust-suppressing agent;

[0036] The preparation process of modified silica is as follows:

[0037] S1: Mix 10 parts of nano silica, 200 parts of toluene and 100 parts of petroleum ether, raise the temperature to 90°C, reflux for 1 hour, then add 0.5 parts of dibutyltin laurate, and under a protective atmosphere, add 15 parts of toluene diisocyanate dropwise, react for 1 hour, centrifuge and filter, and vacuum dry to obtain isocyanate silica.

[0038] S2: Under a protective atmosphere, 10 parts of 3,5-di-tert-butyl-4-hydroxyphenylpropionic acid, 6 parts of allyl glycine, 8 parts of triethylamine, 8 parts of N,N-diisopropylcarbodiimide, and 200 parts of anhydrous dichloromethane were mixed and reacted at room temperature for 3 hours. After the reaction was completed, the mixture was extracted with distilled water, and the organic layer was dried, filtered, and rotary evaporated to obtain intermediate A.

[0039] S3: Under a protective atmosphere, 10 parts of intermediate A were added to 150 parts of tetrahydrofuran, cooled to 0°C in an ice bath, and then 15 parts of oxaloyl chloride and 0.1 parts of N,N-dimethylformamide were slowly added dropwise. The mixture was gradually raised to room temperature and stirred for 2 hours. The solvent was removed by vacuum distillation. Then, it was mixed with 3 parts of melamine, 5 parts of triethylamine, and 150 parts of dimethyl sulfoxide. The mixture was stirred and reacted at 0°C for 1 hour. After the reaction was completed, the inorganic salts were removed by washing with water. The organic phase was dried, concentrated, and purified to obtain the modifier.

[0040] S4: Disperse 10 parts of isocyanate-modified silica in 200 parts of dimethylformamide, add 8 parts of modifier and 0.5 parts of triethylamine, raise the temperature to 70°C, react for 1 hour, after the reaction is completed, cool to room temperature, filter, wash, and dry to obtain modified silica.

[0041] Example 2: A method for preparing a waterproof dust suppressant for coal, comprising the following steps:

[0042] Step 1: Disperse 3 parts sodium alginate and 0.5 parts sodium carboxymethyl cellulose in 120 parts deionized water, stir in a 50°C water bath, add 0.3 parts ammonium persulfate, then add 2 parts modified silica, 0.06 parts N,N'-methylenebisacrylamide, and 4 parts acrylamide, raise the temperature to 70°C, react for 2 hours, cool to room temperature, and obtain a copolymer solution;

[0043] Step 2: Mix 120 parts of copolymer solution, 0.5 parts of sodium dodecylbenzenesulfonate, and 3 parts of carboxymethyl chitosan to obtain a waterproof and dust-suppressing agent;

[0044] The preparation process of modified silica is as follows:

[0045] S1: Mix 12 parts of nano silica, 250 parts of toluene and 150 parts of petroleum ether, raise the temperature to 100°C, reflux for 2 hours, then add 1 part of dibutyltin laurate, and under a protective atmosphere, add 20 parts of toluene diisocyanate dropwise, react for 2 hours, centrifuge and filter, and vacuum dry to obtain isocyanate silica.

[0046] S2: Under a protective atmosphere, 12 parts of 3,5-di-tert-butyl-4-hydroxyphenylpropionic acid, 7 parts of allyl glycine, 10 parts of triethylamine, 10 parts of N,N-diisopropylcarbodiimide, and 300 parts of anhydrous dichloromethane were mixed and reacted at room temperature for 4 hours. After the reaction was completed, the mixture was extracted with distilled water, and the organic layer was dried, filtered, and rotary evaporated to obtain intermediate A.

[0047] S3: Under a protective atmosphere, 12 parts of intermediate A were added to 200 parts of tetrahydrofuran, cooled to 0°C in an ice bath, and then 20 parts of oxaloyl chloride and 0.2 parts of N,N-dimethylformamide were slowly added dropwise. The mixture was gradually raised to room temperature and stirred for 4 hours. The solvent was removed by vacuum distillation. Then, it was mixed with 4 parts of melamine, 7 parts of triethylamine, and 200 parts of dimethyl sulfoxide. The mixture was stirred at 0°C for 2 hours. After the reaction was completed, the inorganic salts were removed by washing with water. The organic phase was dried, concentrated, and purified to obtain the modifier.

[0048] S4: Disperse 12 parts of isocyanate-modified silica in 250 parts of dimethylformamide, add 10 parts of modifier and 1 part of triethylamine, raise the temperature to 80℃, react for 3 hours, after the reaction is completed, cool to room temperature, filter, wash, and dry to obtain modified silica.

[0049] Example 3: A method for preparing a waterproof dust suppressant for coal, comprising the following steps:

[0050] Step 1: Disperse 2.5 parts sodium alginate and 0.4 parts sodium carboxymethyl cellulose in 110 parts deionized water, stir in a 50°C water bath, add 0.2 parts ammonium persulfate, then add 1.5 parts modified silica, 0.045 parts N,N'-methylenebisacrylamide, and 3 parts acrylamide, raise the temperature to 65°C, react for 1.5 h, cool to room temperature, and obtain a copolymer solution;

[0051] Step 2: Mix 110 parts of copolymer solution, 0.3 parts of sodium dodecylbenzenesulfonate, and 2 parts of carboxymethyl chitosan to obtain a waterproof and dust-suppressing agent;

[0052] The preparation process of modified silica is as follows:

[0053] S1: Mix 11 parts of nano-silica, 225 parts of toluene, and 125 parts of petroleum ether, raise the temperature to 95°C, reflux for 1.5 h, then add 0.75 parts of dibutyltin laurylate, and under a protective atmosphere, add 17.5 parts of toluene diisocyanate dropwise, react for 1.5 h, centrifuge, filter, and vacuum dry to obtain isocyanate-modified silica.

[0054] S2: Under a protective atmosphere, 11 parts of 3,5-di-tert-butyl-4-hydroxyphenylpropionic acid, 6.5 parts of allyl glycine, 9 parts of triethylamine, 9 parts of N,N-diisopropylcarbodiimide, and 250 parts of anhydrous dichloromethane were mixed and reacted at room temperature for 3.5 h. After the reaction was completed, the mixture was extracted with distilled water, and the organic layer was dried, filtered, and rotary evaporated to obtain intermediate A.

[0055] S3: Under a protective atmosphere, 11 parts of intermediate A were added to 175 parts of tetrahydrofuran, cooled to 0°C in an ice bath, and then 17.5 parts of oxaloyl chloride and 0.15 parts of N,N-dimethylformamide were slowly added dropwise. The mixture was gradually raised to room temperature and stirred for 3 hours. The solvent was removed by vacuum distillation. Then, it was mixed with 3.5 parts of melamine, 6 parts of triethylamine, and 175 parts of dimethyl sulfoxide. The mixture was stirred at 0°C for 1.5 hours. After the reaction was completed, the inorganic salts were removed by washing with water. The organic phase was dried, concentrated, and purified to obtain the modifier.

[0056] S4: Disperse 11 parts of isocyanate-modified silica in 225 parts of dimethylformamide, add 9 parts of modifier and 0.75 parts of triethylamine, raise the temperature to 75°C, react for 2 hours, after the reaction is completed, cool to room temperature, filter, wash, and dry to obtain modified silica.

[0057] Comparative Example 1: No modified silica was added; all other aspects were the same as in Example 3, as detailed below:

[0058] Step 1: Disperse 2.5 parts sodium alginate and 0.4 parts sodium carboxymethyl cellulose in 110 parts deionized water, stir in a 50°C water bath, add 0.2 parts ammonium persulfate, then add 0.045 parts N,N'-methylenebisacrylamide and 3 parts acrylamide, raise the temperature to 65°C, react for 1.5 h, cool to room temperature, and obtain copolymer solution;

[0059] Step 2: Mix 110 parts of copolymer solution, 0.3 parts of sodium dodecylbenzenesulfonate, and 2 parts of carboxymethyl chitosan to obtain a waterproof and dust-suppressing agent.

[0060] Comparative Example 2: No modification was made to the silica; all other aspects were the same as in Example 3, as detailed below:

[0061] Step 1: Disperse 2.5 parts sodium alginate and 0.4 parts sodium carboxymethyl cellulose in 110 parts deionized water, stir in a 50°C water bath, add 0.2 parts ammonium persulfate, then add 1.5 parts nano silica, 0.045 parts N,N'-methylenebisacrylamide, and 3 parts acrylamide, raise the temperature to 65°C, react for 1.5 h, cool to room temperature, and obtain a copolymer solution;

[0062] Step 2: Mix 110 parts of copolymer solution, 0.3 parts of sodium dodecylbenzenesulfonate, and 2 parts of carboxymethyl chitosan to obtain a waterproof and dust-suppressing agent.

[0063] Testing experiment: The waterproof and dust-suppressing agents obtained in the examples and comparative examples were sprayed onto the surface of coal powder (coal powder mass 140±0.1g, particle size 300-400 mesh), and allowed to dry naturally to form a solidified layer; then relevant tests were carried out.

[0064] (1) Use a pressure gauge probe to apply pressure perpendicularly to the surface of the cured layer at a constant rate (e.g., 1 mm / min) until the cured layer breaks, and record the maximum pressure value.

[0065] (2) The obtained cured layer was continuously eroded at a wind speed of 12 m / s for 20 minutes, and the mass difference before and after was recorded to calculate the mass loss rate.

[0066] (3) Place the obtained solidified layer under a tap and let the water flow over the surface of the coal pan sample at a flow rate of 36L / h for 2 minutes. Then take it out, dry it, weigh the mass before and after the two times, and calculate the water erosion rate.

[0067] The obtained data is shown in the table below:

[0068]

[0069] Table 1

[0070] Conclusion: This invention significantly improves the performance of waterproof dust suppressants for coal by chemically modifying silica. Experimental data show that Examples 1, 2, and 3, which incorporate modified silica, are superior to Comparative Example 1 (pressure 43 N, wind erosion rate 7.5%, water erosion rate 6.8%) and Comparative Example 2 (pressure 46 N, wind erosion rate 4.6%, water erosion rate 5.7%) in terms of pressure (50-56 N), wind erosion rate (0.25%-0.31%), and water erosion rate (2.2%-2.6%), respectively, in terms of pressure (50-56 N), wind erosion rate (0.25%-0.31%), and water erosion rate (2.2%-2.6%). Modified silica, by enhancing cross-linking and introducing antioxidant and hydrophobic groups, significantly improves the mechanical strength, wind erosion resistance, and waterproof performance of the dust suppressant, effectively inhibiting secondary dust generation and water erosion loss from coal dust, thus verifying its excellent effect in the field of coal dust suppression.

[0071] In the description of this specification, the references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0072] The above description is merely an example and illustration of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described, or use similar methods to replace them, as long as they do not deviate from the invention or exceed the scope defined in the claims, all of which should fall within the protection scope of the present invention.

Claims

1. A method for preparing a water repellent dust suppressant for coal, characterized by: Includes the following steps: Step 1: Disperse sodium alginate and sodium carboxymethyl cellulose in deionized water, stir in a 50°C water bath, add ammonium persulfate, then add modified silica, N,N'-methylenebisacrylamide, and acrylamide, raise the temperature to 60-70°C, react for 1-2 hours, cool to room temperature, and obtain the copolymer solution. Step 2: Mix the copolymer solution, sodium dodecylbenzenesulfonate, and carboxymethyl chitosan to obtain a waterproof and dust-suppressing agent; The preparation process of modified silica is as follows: S1: Mix nano-silica, toluene, and petroleum ether, raise the temperature to 90-100℃, reflux for 1-2 hours, then add dibutyltin laurate, add toluene diisocyanate dropwise under a protective atmosphere, react for 1-2 hours, centrifuge and filter, and vacuum dry to obtain isocyanate-modified silica. S2: Under a protective atmosphere, 3,5-di-tert-butyl-4-hydroxyphenylpropionic acid, allyl glycine, triethylamine, N,N-diisopropylcarbodiimide, and anhydrous dichloromethane were mixed and reacted at room temperature for 3-4 hours. After the reaction was completed, the mixture was extracted with distilled water, the organic layer was taken, dried, filtered, and rotary evaporated to obtain intermediate A. S3: Under a protective atmosphere, intermediate A was added to tetrahydrofuran and cooled to 0°C in an ice bath. Then, oxalyl chloride and N,N-dimethylformamide were slowly added dropwise. The mixture was gradually raised to room temperature and stirred for 2-4 hours. The solvent was removed by vacuum distillation. Subsequently, it was mixed with melamine, triethylamine, and dimethyl sulfoxide and stirred at 0°C for 1-2 hours. After the reaction was completed, the inorganic salts were removed by washing with water. The organic phase was dried, concentrated, and purified to obtain the modifier. S4: Disperse isocyanated silica in dimethylformamide, add modifier and triethylamine, raise the temperature to 70-80℃, react for 1-3 hours, after the reaction is completed, cool to room temperature, filter, wash, and dry to obtain modified silica.

2. The method for preparing a waterproof and dust suppressing agent for coal according to claim 1, characterized in that: The copolymer solution contains the following components by weight: 2-3 parts sodium alginate, 0.3-0.5 parts sodium carboxymethyl cellulose, 100-120 parts deionized water, 0.1-0.3 parts ammonium persulfate, 1-2 parts modified silica, 2-4 parts acrylamide, and 0.03-0.06 parts N,N'-methylenebisacrylamide. The raw materials for the waterproof and dust-suppressing agent include the following components: by weight, 100-120 parts copolymer solution, 0.1-0.5 parts sodium dodecylbenzenesulfonate, and 1-3 parts carboxymethyl chitosan.

3. The method for preparing a waterproof dust suppressant for coal according to claim 1, characterized in that: The isocyanate-modified silica raw material comprises the following components: by weight, 10-12 parts nano silica, 200-250 parts toluene, 100-150 parts petroleum ether, 0.5-1 parts dibutyltin laurylate, and 15-20 parts toluene diisocyanate.

4. The method for preparing a waterproof dust suppressant for coal according to claim 1, characterized in that: The intermediate A raw material comprises the following components: by weight, 10-12 parts of 3,5-di-tert-butyl-4-hydroxyphenylpropionic acid, 6-7 parts of allyl glycine, 8-10 parts of triethylamine, 8-10 parts of N,N-diisopropylcarbodiimide, and 200-300 parts of anhydrous dichloromethane.

5. The method for preparing a waterproof dust suppressant for coal according to claim 1, characterized in that: The modifier raw material includes the following components by weight: 10-12 parts intermediate A, 150-200 parts tetrahydrofuran, 15-20 parts oxaloyl chloride, 0.1-0.2 parts N,N-dimethylformamide, 3-4 parts melamine, 5-7 parts triethylamine, and 150-200 parts dimethyl sulfoxide.

6. The method for preparing a waterproof dust suppressant for coal according to claim 1, characterized in that: The modified silica raw material comprises the following components: by weight, 10-12 parts isocyanate-modified silica, 8-10 parts modifier, 0.5-1 part triethylamine, and 200-250 parts N,N-dimethylformamide.

7. The waterproof dust suppressant obtained by the preparation method of a waterproof dust suppressant for coal as described in any one of claims 1-6.

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