Coal dust suppressant and method for producing the same

Abstract

To provide a coal dust inhibitor having high permeability and strong shell forming ability, excellent in dust inhibiting effect and capable of effectively avoiding dust contamination during mining, storage and transportation of coal, and to provide a method for producing the same.SOLUTION: The coal tar suppressant includes a composition A and a composition B, wherein a mass ratio of the composition A to the composition B is (0.95 to 1.05): (0.95 to 1.05), the composition A includes 10 to 15 parts by mass of modified carboxymethyl cellulose, 10 to 15 parts by mass of silica sol, 6 to 10 parts by mass of polyether polyol, 3 to 6 parts by mass of isocyanate, and 1 to 3 parts by mass of surfactant, and the composition B includes 40 to 50 parts by mass of water and 0.05 to 0.1 parts by mass of catalyst.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention belongs to the technical field of dust suppression, and specifically, the present invention relates to a coal dust suppressant and a method for preparing the same. [Background technology]

[0002] With the continued mining of open-cut coal mines, many of China's open-cut coal mines have entered the immersed mining stage, requiring large vehicles for transportation, resulting in serious dust problems in the coal piles and machinery work areas of open-cut coal mines. Excessive dust in open-cut coal mine areas significantly reduces visibility and affects driving safety. Furthermore, high concentrations of dust can seriously affect the health of workers and cause occupational diseases, making dust control in open-cut coal mine areas an urgent issue.

[0003] Traditional dust suppression methods mainly involve installing protective nets, water sprinkling, and spraying dust suppressants. Considering both the dust suppression effect and the cost of dust suppression measures, spraying dust suppressants is currently the best dust control method. Currently, the most widely used chemical dust suppressants in open-cut coal mines are polymer dust suppressants, primarily composed of carboxymethyl cellulose and certain additives. However, because carboxymethyl cellulose is a swellable cellulose, it becomes highly viscous when dissolved in water. Therefore, the biggest problem with this type of dust suppressant system is the difficulty in balancing penetration and shell formation strength. High viscosity dust suppression solutions provide good dust suppression after application but slow penetration, especially in dark or low-temperature environments. Low viscosity solutions provide fast penetration but result in small shell formation thickness, low strength, and poor dust suppression. Another problem with this type of dust suppressant is that its crust formation rate is highly dependent on temperature, and after application in a dark or low-temperature environment, the crust formation rate is very slow. Therefore, open-cut coal mines need dust suppressants with high penetration and strong crust formation. Summary of the Invention [Problem to be solved by the invention]

[0004] The present invention aims to solve at least part of one of the technical problems in the related art, and therefore, embodiments of the present invention provide a coal dust suppressant and a method for preparing the same. [Means for solving the problem]

[0005] One aspect of the present invention provides a coal dust suppressant, which comprises a composition A and a composition B, and the mass ratio of the composition A to the composition B is (0.95-1.05):(0.95-1.05); The composition A contains 10 to 15 parts by mass of modified carboxymethyl cellulose, 10 to 15 parts by mass of silica sol, 6 to 10 parts by mass of polyether polyol, 3 to 6 parts by mass of isocyanate, and 1 to 3 parts by mass of a surfactant, The composition B contains 40 to 50 parts by mass of water and 0.05 to 0.1 parts by mass of a catalyst.

[0006] In the embodiment of the present invention, by optimizing the composition of the dust suppressant, the dust suppressant has high permeability and strong shell-forming ability, which has good dust suppression effect and can effectively avoid dust pollution during coal mining, storage and transportation.

[0007] In some embodiments, the modified carboxymethyl cellulose is Step S1: Stirring and mixing sodium carboxymethylcellulose and a sulfuric acid solution, and then suction filtering to obtain carboxymethylcellulose; Step S2: washing the carboxymethyl cellulose obtained in step S1 with water by stirring and suction filtering, washing with acetic acid and suction filtering, and washing with butyric acid and suction filtering; Step S3: activating the carboxymethyl cellulose obtained by washing in step S2, and after the temperature is lowered to 0 to 5°C, adding a mixed solution of acetic anhydride, butyric anhydride, and concentrated sulfuric acid to react by heating; Step S4: adding an aqueous acetic acid solution to the reaction product obtained in step S3 and reacting at elevated temperature; adding a mixed solution of magnesium acetate, acetic acid, and deionized water; adding the mixture to water and stirring to precipitate; washing with water; and drying to obtain the modified carboxymethyl cellulose. It is produced by a method comprising:

[0008] Furthermore, in the step S1, the mass ratio of the sodium carboxymethyl cellulose to the sulfuric acid solution is (45 to 55):1, preferably 50:1; Preferably, the concentration of the sulfuric acid solution is 0.05 to 0.2 mol / L, preferably 0.1 mol / L; And / or, the temperature for the stirring and mixing is room temperature, and the stirring and mixing time is 20 to 30 minutes.

[0009] Furthermore, in step S3, the temperature of the activation treatment is 25 to 30°C, and the activation treatment time is 1 to 3 hours; and / or the mass ratio of the acetic anhydride, the butyric anhydride, and the concentrated sulfuric acid is 1:(1.5 to 2.5):1, preferably 1:2:1; And / or, the heating reaction process is performed by first raising the temperature to 55 to 65°C, reacting for 1.5 to 2 hours, and then raising the temperature to 70 to 75°C, and reacting for 0.5 to 1 hour.

[0010] Furthermore, in step S4, the reaction temperature of the temperature-raising reaction is 80 to 90°C, and the reaction time is 2 to 3 hours; and / or the mass ratio of the magnesium acetate to the acetic acid to the deionized water is 10:20:(65 to 75), preferably 10:20:70; And / or, the drying temperature is 80 to 100°C, and the drying time is 0.5 to 2 hours.

[0011] In some embodiments, the polyether polyol comprises a mixture of ED-28 and MN-3050DF; Preferably, the mass ratio of the ED-28 to the MN-3050DF is (1.5 to 2.5):(2.5 to 3.5), and more preferably 2:3.

[0012] In some embodiments, the isocyanate comprises a mixture of one or two of dicyclohexylmethane diisocyanate and lysine diisocyanate.

[0013] In some embodiments, the surfactant comprises at least one of the alkyl glycosides APG0810, APG1214, APG0814, APG0816, and APG1216.

[0014] In some embodiments, the catalyst comprises a mixture of 2-amino-fluorobenzylamine and bismuth 2-ethylhexanoate; Preferably, the mass ratio of the 2-amino-fluorobenzylamine to the bismuth 2-ethylhexanoate is (1.5-2.5):(0.5-1.5), and preferably 2:1.

[0015] Another aspect of an embodiment of the present invention provides a method for producing a coal dust suppressant, the method comprising: Mixing modified carboxymethyl cellulose, silica sol, polyether polyol, isocyanate, and surfactant to obtain composition A; and mixing water and a catalyst to obtain composition B.

[0016] The features and advantages described above for the coal dust suppressant also apply to the method for manufacturing the coal dust suppressant, and a detailed description thereof will be omitted here. [Effects of the Invention]

[0017] The advantages and beneficial effects of the embodiments of the present invention are as follows: 1) In the absence of light irradiation, the dust suppressant of the present invention takes approximately 5 to 6 minutes from application to surface drying, which is 10 times faster than the 60 to 90 minutes required for conventional carboxymethyl cellulose dust suppressant. 2) The shell thickness of the conventional carboxymethyl cellulose dust suppressant is about 5 mm, while the shell thickness of the dust suppressant of the present invention is about 20 mm, which is four times better. 3) The dust suppressant of the embodiment of the present invention has high shell strength and a certain degree of toughness after shell formation, and has a wind erosion rate of less than 0.3%, which is lower than the wind erosion rate of about 1% of conventional carboxymethyl cellulose dust suppressant, and has a better dust suppression effect. 4) The dust suppressant of the present invention has a heat generating function by itself, and the shell formation is not easily affected by light or temperature, and the shell can be formed quickly even at low temperatures. DETAILED DESCRIPTION OF THE INVENTION

[0018] In order to clarify the objectives, technical solutions and advantages of the embodiments of the present invention, the technical solutions of the embodiments of the present invention will be described below clearly and completely. Obviously, the described embodiments are only some of the embodiments of the present invention, but not all of the embodiments. Based on the described embodiments of the present invention, all other embodiments obtained by those skilled in the art without any creative efforts fall within the scope of protection of the present invention.

[0019] Unless otherwise defined, technical or scientific terms used herein shall have the common meanings that are understood by those skilled in the art.

[0020] When numerical values ​​are described herein as ranges, such disclosure includes disclosure of all possible subranges within that range, as well as specific numerical values ​​within that range, whether or not a particular value or subrange is explicitly recited.

[0021] As used herein, the terms "including" and "comprises" and their various variations mean that other elements or wholes may be included, although permitted, and not specifically set forth.

[0022] As used herein, the term "and / or" refers to a relationship between related objects, and indicates that three types of relationships may exist. For example, A and / or B includes three situations: A exists alone, A and B exist simultaneously, and B exists alone.

[0023] One aspect of the present invention provides a coal dust suppressant comprising composition A and composition B, wherein the mass ratio of composition A to composition B is (0.95-1.05):(0.95-1.05); The composition A contains 10 to 15 parts by mass of modified carboxymethyl cellulose, 10 to 15 parts by mass of silica sol, 6 to 10 parts by mass of polyether polyol, 3 to 6 parts by mass of isocyanate, and 1 to 3 parts by mass of a surfactant, The composition B contains 40 to 50 parts by mass of water and 0.05 to 0.1 parts by mass of a catalyst.

[0024] In practical use, the dust suppressant of the present invention is prepared by mixing two compositions, A and B, diluting them 50 to 100 times on-site, and then quickly spraying them. After spraying, the dust suppressant forms a sandwich structure consisting of a surface layer, a middle layer, and a bottom layer. The surface layer is a polyurethane structure with high strength and certain toughness, the middle layer is cellulose cement, and the bottom layer is a silicic acid polymer network. The reaction mechanism is mainly as follows: After mixing two compositions, A and B, and spraying them on the surface of the coal powder, the silica sol component rapidly penetrates into the bottom layer due to its structural characteristics. Shortly thereafter, the modified carboxymethyl cellulose also partially penetrates. At the same time, in the top layer, the isocyanate and polyether polyol rapidly solidify under the action of the catalyst, releasing CO2 gas. The pressure of the CO2 gas further penetrates the modified carboxymethyl cellulose, connecting it to the silica sol. The isocyanate and polyether polyol release heat during the reaction, which is conveniently used to solidify the modified carboxymethyl cellulose and silica sol. Furthermore, since the modified carboxymethyl cellulose and silica sol contain a large amount of hydroxyl groups, they can react with isocyanate, and therefore the surface, middle and lower layers form a polymer interpenetrating network, resulting in high strength.

[0025] In some embodiments, the modified carboxymethyl cellulose is Step S1: Stirring and mixing sodium carboxymethylcellulose and a sulfuric acid solution, and then suction filtering to obtain carboxymethylcellulose; Step S2: washing the carboxymethyl cellulose obtained in step S1 with water by stirring and suction filtering, washing with acetic acid and suction filtering, and washing with butyric acid and suction filtering; Step S3: activating the carboxymethyl cellulose obtained by washing in step S2, and after the temperature is lowered to 0 to 5°C, adding a mixed solution of acetic anhydride, butyric anhydride, and concentrated sulfuric acid to react by heating; Step S4: adding an aqueous acetic acid solution to the reaction product obtained in step S3 and reacting at elevated temperature; adding a mixed solution of magnesium acetate, acetic acid, and deionized water; adding the mixture to water and stirring to precipitate; washing with water; and drying to obtain the modified carboxymethyl cellulose. It is produced by a method comprising:

[0026] Furthermore, in step S1, the mass ratio of the sodium carboxymethylcellulose to the sulfuric acid solution is (45 to 55):1, and non-limiting examples include 45:1, 48:1, 50:1, 55:1, etc., and preferably 50:1; Preferably, the concentration of the sulfuric acid solution is 0.05 to 0.2 mol / L, including, but not limited to, 0.05 mol / L, 0.1 mol / L, 0.15 mol / L, 0.2 mol / L, and the like, preferably 0.1 mol / L; And / or, the temperature for stirring and mixing is room temperature, and the time for stirring and mixing is 20 to 30 minutes, including, but not limited to, 20 minutes, 25 minutes, and 30 minutes.

[0027] Furthermore, in step S3, the temperature of the activation treatment is 25 to 30°C, and examples thereof include, but are not limited to, 25°C, 28°C, and 30°C, and the time of the activation treatment is 1 to 3 hours, and examples thereof include, but are not limited to, 1 hour, 2 hours, and 3 hours, and / or the mass ratio of the acetic anhydride, the butyric anhydride, and the concentrated sulfuric acid is 1:(1.5-2.5):1, including, but not limited to, 1:1.5:1, 1:1.8:1, 1:2:1, 1:2.5:1, and the like, preferably 1:2:1; And / or, the heating reaction process is performed by first raising the temperature to 55 to 65°C, reacting for 1.5 to 2 hours, and then raising the temperature to 70 to 75°C, and reacting for 0.5 to 1 hour.

[0028] Furthermore, in step S4, the reaction temperature of the temperature-raising reaction is 80 to 90°C, including, but not limited to, 80°C, 85°C, and 90°C, and the reaction time is 2 to 3 hours, including, but not limited to, 2 hours, 2.5 hours, and 3 hours. and / or the mass ratio of the magnesium acetate to the acetic acid to the deionized water is 10:20:(65-75), including, but not limited to, 10:20:65, 10:20:70, 10:20:72, 10:20:75, and preferably 10:20:70; And / or, the drying temperature is 80 to 100°C, including but not limited to, 80°C, 85°C, 90°C, 100°C, etc., and the drying time is 0.5 to 2 hours, including but not limited to, 0.5 hours, 1 hour, 2 hours, etc.

[0029] In the examples of the present invention, by modifying carboxymethyl cellulose, more active functional groups can be grafted onto its structure, which is advantageous in improving its solubility and reactivity with isocyanates, and further improves its mechanical toughness and shell-forming strength.

[0030] In some embodiments, the polyether polyol comprises a mixture of ED-28 (purchased from Shandong Blue Star Dongda Co., Ltd.) and MN-3050DF (purchased from Shandong Blue Star Dongda Co., Ltd.); Preferably, the mass ratio of the ED-28 to the MN-3050DF is (1.5-2.5):(2.5-3.5), and non-limiting examples include 1.5:2.5, 1.8:3, 2:3, 2.5:3.5, etc., and preferably 2:3.

[0031] Both ED-28 and MN-3050DF are low-saturated polypropylene oxide ether triols with a molecular weight of 3000. Using the two in combination is beneficial for improving the tensile strength and toughness of the solidified product. In the examples of the present invention, the mass ratio of ED-28 to MN-3050DF is limited to the range of (1.5-2.5):(2.5-3.5), which further enhances the structural advantages of these two types of polyether polyols and helps achieve a synergistic effect.

[0032] In some embodiments, the isocyanate comprises a mixture of one or two of dicyclohexylmethane diisocyanate and lysine diisocyanate.

[0033] In some embodiments, the surfactant comprises at least one of the alkyl glycosides APG0810, APG1214, APG0814, APG0816, and APG1216.

[0034] In some embodiments, the catalyst comprises a mixture of 2-amino-fluorobenzylamine and bismuth 2-ethylhexanoate; Preferably, the mass ratio of the 2-amino-fluorobenzylamine to the bismuth 2-ethylhexanoate is (1.5-2.5):(0.5-1.5), including, but not limited to, 1.5:0.5, 1.8:1.2, 2:1, 2.5:1.5, and preferably 2:1.

[0035] 2-Amino-fluorobenzylamine is used as an organic amine catalyst, exhibiting high selectivity for the foaming reaction. Bismuth 2-ethylhexanoate is used as an organometallic bismuth, exhibiting even higher selectivity for the gelling reaction. Using these two catalysts in combination is advantageous for achieving a balance between the foaming and gelling reactions. Furthermore, the inventors discovered through research that adding too much 2-amino-fluorobenzylamine results in significant foaming and a decrease in the strength of the solidified product, while adding too much bismuth 2-ethylhexanoate results in a stronger gel and poorer permeability. Therefore, in the present invention, it is advantageous to limit the mass ratio of 2-amino-fluorobenzylamine to bismuth 2-ethylhexanoate to (1.5-2.5):(0.5-1.5).

[0036] Another aspect of the present invention further provides a method for producing a coal dust suppressant, comprising: Mixing modified carboxymethyl cellulose, silica sol, polyether polyol, isocyanate, and surfactant to obtain composition A; and mixing water and a catalyst to obtain composition B.

[0037] The following are non-limiting examples and comparative examples of the present invention, in which the solutions in the comparative examples are not prior art and are provided merely for comparison with the solutions in the examples, and are not intended to limit the present invention. Unless otherwise specified, the various raw materials used in the examples and comparative examples are either commercially available products or prepared by conventional methods.

[0038] The modified carboxymethyl cellulose in the following examples and comparative examples is produced by the following steps.

[0039] S1: 10 g of sodium carboxymethylcellulose was weighed, 0.2 g of sulfuric acid solution (0.1 mol / L) was added, and the mixture was stirred at room temperature for 30 minutes, followed by suction filtration to obtain carboxymethylcellulose.

[0040] S2: The carboxymethyl cellulose obtained in step S1 is washed with 500 mL of water for 30 minutes under stirring, and then suction filtered. Then, the carboxymethyl cellulose is washed three times with 500 mL of acetic acid and suction filtered. Then, the carboxymethyl cellulose is washed three times with 500 mL of butyric acid and suction filtered. This washing process is used to remove sulfuric acid, water, and acetic acid, respectively.

[0041] S3: The carboxymethyl cellulose obtained by washing in step S2 is placed in a 1000 mL three-necked flask and activated at 25°C for 2 hours. After the temperature drops to about 5°C, a mixed solution of 3 g of acetic anhydride, 6 g of butyric anhydride and 3 g of concentrated sulfuric acid is added to the three-necked flask. The temperature is then gradually raised to 60°C and reacted for 1.5 hours, then raised to 70°C and reacted for 1 hour. After the reaction is complete, the reaction product system becomes a transparent viscous substance.

[0042] S4: 2 g of acetic acid was prepared into a 50 wt % aqueous solution, which was slowly added to the reaction product obtained in step S3 (the dropwise addition was completed in about 10 minutes), and the temperature was raised to 85°C and the reaction was carried out for 2 hours. After that, a mixed solution of 7 g of magnesium acetate, 14 g of acetic acid, and 49 g of deionized water was added to neutralize the sulfuric acid catalyst. The mixture was then added to a large amount of stirred water to precipitate, washed twice with water, and finally dried at 90°C for 1 hour to obtain modified carboxymethyl cellulose.

[0043] Example 1 This embodiment provides a coal dust suppressant comprising composition A and composition B, wherein the mass ratio of composition A to composition B is 1:1; Composition A contains 10 parts by mass of modified carboxymethyl cellulose, 15 parts by mass of silica sol, 8 parts by mass of polyether polyol, 4 parts by mass of isocyanate, and 1 part by mass of a surfactant, Composition B contains 45 parts by weight of water and 0.06 parts by weight of catalyst.

[0044] In this example, the polyether polyol is a mixture of ED-28 and MN-3050DF, and the mass ratio of ED-28 to MN-3050DF is 2:3.

[0045] In this example, the isocyanate is a mixture of dicyclohexylmethane diisocyanate and lysine diisocyanate, and the mass ratio of dicyclohexylmethane diisocyanate to lysine diisocyanate is 1:1.

[0046] In this example, the surfactant is APG0810.

[0047] In this example, the catalyst is a mixture of 2-amino-fluorobenzylamine and bismuth 2-ethylhexanoate, where the mass ratio of 2-amino-fluorobenzylamine to bismuth 2-ethylhexanoate is 2:1.

[0048] Example 2 This embodiment provides a coal dust suppressant comprising composition A and composition B, wherein the mass ratio of composition A to composition B is 1:1; Here, composition A contains 15 parts by mass of modified carboxymethyl cellulose, 10 parts by mass of silica sol, 6 parts by mass of polyether polyol, 5 parts by mass of isocyanate, and 1 part by mass of surfactant, Composition B contains 45 parts by weight of water and 0.06 parts by weight of catalyst.

[0049] In this example, the polyether polyol comprises a mixture of ED-28 and MN-3050DF, with the weight ratio of ED-28 to MN-3050DF being 2:3.

[0050] In this example, the isocyanate is a mixture of dicyclohexylmethane diisocyanate and lysine diisocyanate, and the mass ratio of dicyclohexylmethane diisocyanate to lysine diisocyanate is 1:1.

[0051] In this example, the surfactant is APG0810.

[0052] In this example, the catalyst is a mixture of 2-amino-fluorobenzylamine and bismuth 2-ethylhexanoate, where the mass ratio of 2-amino-fluorobenzylamine to bismuth 2-ethylhexanoate is 2:1.

[0053] Example 3 The present embodiment provides a coal dust suppressant comprising composition A and composition B, wherein the mass ratio of composition A to composition B is 1:1; Here, composition A contains 10 parts by mass of modified carboxymethyl cellulose, 15 parts by mass of silica sol, 8 parts by mass of polyether polyol, 4 parts by mass of isocyanate, and 1 part by mass of surfactant, Composition B contains 50 parts by weight of water and 0.1 parts by weight of catalyst.

[0054] In this example, the polyether polyol is a mixture of ED-28 and MN-3050DF, and the mass ratio of ED-28 to MN-3050DF is 2:3.

[0055] In this example, the cyanate is a mixture of dicyclohexylmethane diisocyanate and lysine diisocyanate, and the weight ratio of dicyclohexylmethane diisocyanate to lysine diisocyanate is 1:1.

[0056] In this example, the surfactant is the alkyl glycoside APG0810.

[0057] In this example, the catalyst is a mixture of 2-amino-fluorobenzylamine and bismuth 2-ethylhexanoate, where the mass ratio of 2-amino-fluorobenzylamine to bismuth 2-ethylhexanoate is 2:1.

[0058] Example 4 The present embodiment provides a coal dust suppressant comprising composition A and composition B, wherein the mass ratio of composition A to composition B is 1:1; Composition A contains 10 parts by mass of modified carboxymethyl cellulose, 15 parts by mass of silica sol, 8 parts by mass of polyether polyol, 4 parts by mass of isocyanate, and 1 part by mass of a surfactant, Composition B contains 45 parts by weight of water and 0.06 parts by weight of catalyst.

[0059] In this example, the polyether polyol is a mixture of ED-28 and MN-3050DF, and the mass ratio of ED-28 to MN-3050DF is 2.5:3.5.

[0060] In this example, the isocyanate is a mixture of dicyclohexylmethane diisocyanate and lysine diisocyanate, and the mass ratio of dicyclohexylmethane diisocyanate to lysine diisocyanate is 1:1.

[0061] In this example, the surfactant is APG0810.

[0062] In this example, the catalyst is a mixture of 2-amino-fluorobenzylamine and bismuth 2-ethylhexanoate, where the mass ratio of 2-amino-fluorobenzylamine to bismuth 2-ethylhexanoate is 2:1.

[0063] Example 5 The present embodiment provides a coal dust suppressant comprising composition A and composition B, wherein the mass ratio of composition A to composition B is 1:1; Composition A contains 10 parts by mass of modified carboxymethyl cellulose, 15 parts by mass of silica sol, 8 parts by mass of polyether polyol, 4 parts by mass of isocyanate, and 1 part by mass of a surfactant, Composition B contains 45 parts by weight of water and 0.06 parts by weight of catalyst.

[0064] In this example, the polyether polyol is a mixture of ED-28 and MN-3050DF, and the mass ratio of ED-28 to MN-3050DF is 2:3.

[0065] In this example, the isocyanate is dicyclohexylmethane diisocyanate.

[0066] In this example, the surfactant is APG0810.

[0067] In this example, the catalyst is a mixture of 2-amino-fluorobenzylamine and bismuth 2-ethylhexanoate, where the mass ratio of 2-amino-fluorobenzylamine to bismuth 2-ethylhexanoate is 2:1.

[0068] Comparative Example 1 In this comparative example, a coal dust suppressant is provided, which includes 50 parts by mass of carboxymethyl cellulose, 20 parts by mass of polyether polyol, 25 parts by mass of water, and 5 parts by mass of a surfactant; The polyether polyol is HSH330, The surfactant was a mixture of APG1214 and APG0814, with the mass ratio of APG1214 to APG0814 being 2:1.

[0069] Comparative Example 2 This comparison provides a coal dust suppressant comprising composition A and composition B, the mass ratio of composition A to composition B being 1:1; Composition A contains 10 parts by mass of carboxymethyl cellulose, 15 parts by mass of silica sol, 8 parts by mass of polyether polyol, 4 parts by mass of isocyanate, and 1 part by mass of a surfactant; Composition B contains 45 parts by weight of water and 0.06 parts by weight of catalyst.

[0070] In this comparative example, the polyether polyol was a mixture of ED-28 and MN-3050DF, and the mass ratio of ED-28 to MN-3050DF was 2:3.

[0071] In this comparative example, the isocyanate is a mixture of dicyclohexylmethane diisocyanate and lysine diisocyanate, and the mass ratio of dicyclohexylmethane diisocyanate to lysine diisocyanate is 1:1.

[0072] In this comparative example, the surfactant is APG0810.

[0073] In this comparative example, the catalyst is a mixture of 2-amino-fluorobenzylamine and bismuth 2-ethylhexanoate, and the mass ratio of 2-amino-fluorobenzylamine to bismuth 2-ethylhexanoate is 2:1.

[0074] Comparative Example 3 This comparison provides a coal dust suppressant comprising composition A and composition B, the mass ratio of composition A to composition B being 1:1; Composition A contains 10 parts by mass of modified carboxymethyl cellulose, 15 parts by mass of silica sol, and 1 part by mass of a surfactant, Composition B contains 45 parts by weight of water and 0.06 parts by weight of catalyst.

[0075] In this comparative example, the surfactant is APG0810.

[0076] In this comparative example, the catalyst is a mixture of 2-amino-fluorobenzylamine and bismuth 2-ethylhexanoate, and the mass ratio of 2-amino-fluorobenzylamine to bismuth 2-ethylhexanoate is 2:1.

[0077] The dust suppressants prepared in the above Examples and Comparative Examples were subjected to performance tests, and the results are shown in Table 1. [Table 1]

[0078] As can be seen from Table 1, compared with the dust suppressant in the comparative example, the dust suppressant in the example of the present invention has high permeability and low wind erosion rate, and its shell thickness is thicker and the shell formation is less affected by light and temperature, demonstrating good dust suppression ability.

[0079] In the present invention, terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" indicate that the specific feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the exemplary 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 appropriate manner in any one or more examples. Furthermore, unless mutually inconsistent, those skilled in the art may combine or combine different embodiments or examples described herein, and features of different embodiments or examples.

[0080] Although the embodiments of the present invention have been described above, the above embodiments are merely illustrative and do not limit the present invention, and those skilled in the art may make changes, modifications, substitutions and variations to the above embodiments without departing from the scope of the present invention.

Claims

1. A coal dust suppressant, comprising composition A and composition B, wherein the mass ratio of composition A to composition B is (0.95 to 1.05):(0.95 to 1.05); The composition A includes 10 to 15 parts by mass of modified carboxymethyl cellulose, 10 to 15 parts by mass of silica sol, 6 to 10 parts by mass of polyether polyol, 3 to 6 parts by mass of isocyanate, and 1 to 3 parts by mass of a surfactant, The composition B contains 40 to 50 parts by mass of water and 0.05 to 0.1 parts by mass of a catalyst. A coal dust suppressant characterized by:

2. The modified carboxymethyl cellulose is Step S1: Stirring and mixing sodium carboxymethyl cellulose and a sulfuric acid solution, and then suction filtering to obtain carboxymethyl cellulose; Step S2: washing the carboxymethyl cellulose obtained in step S1 with water by stirring and suction filtering, washing with acetic acid and suction filtering, and washing with butyric acid and suction filtering; Step S3: activating the carboxymethyl cellulose obtained by washing in step S2, and after the temperature is lowered to 0 to 5°C, adding a mixed solution of acetic anhydride, butyric anhydride, and concentrated sulfuric acid to the carboxymethyl cellulose and reacting the carboxymethyl cellulose by heating; Step S4: adding an aqueous acetic acid solution to the reaction product obtained in step S3, causing a reaction by raising the temperature, adding a mixed solution of magnesium acetate, acetic acid, and deionized water, adding the mixture to water, stirring to precipitate, washing with water, and drying to obtain the modified carboxymethyl cellulose; Produced by a process comprising: The coal dust suppressant according to claim 1 .

3. In the step S1, the mass ratio of the sodium carboxymethyl cellulose to the sulfuric acid solution is (45 to 55):1; The concentration of the sulfuric acid solution is 0.05 to 0.2 mol / L, And / or, the temperature of the stirring and mixing is room temperature, and the stirring and mixing time is 20 to 30 minutes.

3. The coal dust suppressant according to claim 2.

4. In step S3, the temperature of the activation treatment is 25 to 30°C, and the time of the activation treatment is 1 to 3 hours; and / or the mass ratio of the acetic anhydride to the butyric anhydride to the concentrated sulfuric acid is 1:(1.5 to 2.5):1; And / or, the heating reaction process is performed by first raising the temperature to 55-65°C, reacting for 1.5-2 hours, and then raising the temperature to 70-75°C, reacting for 0.5-1 hour; 3. The coal dust suppressant according to claim 2.

5. In step S4, the reaction temperature of the temperature-raising reaction is 80 to 90°C, and the reaction time is 2 to 3 hours; and / or the mass ratio of the magnesium acetate to the acetic acid to the deionized water is 10:20:(65 to 75); And / or, the drying temperature is 80 to 100°C, and the drying time is 0.5 to 2 hours.

3. The coal dust suppressant according to claim 2.

6. the polyether polyol comprises a mixture of ED-28 and MN-3050DF; The mass ratio of the ED-28 to the MN-3050DF is (1.5 to 2.5):(2.5 to 3.5). The coal dust suppressant according to claim 1 .

7. The isocyanate comprises a mixture of one or two of dicyclohexylmethane diisocyanate and lysine diisocyanate. The coal dust suppressant according to claim 1 .

8. the surfactant comprises at least one of the alkyl glycosides APG0810, APG1214, APG0814, APG0816, and APG1216; The coal dust suppressant according to claim 1 .

9. the catalyst comprises a mixture of 2-amino-fluorobenzylamine and bismuth 2-ethylhexanoate; the mass ratio of the 2-amino-fluorobenzylamine to the bismuth 2-ethylhexanoate is (1.5 to 2.5):(0.5 to 1.5); The coal dust suppressant according to claim 1 .

10. A method for producing a coal dust inhibitor according to any one of claims 1 to 9, Mixing modified carboxymethyl cellulose, silica sol, polyether polyol, isocyanate, and surfactant to obtain composition A; mixing water and a catalyst to obtain composition B; A method for producing a coal dust inhibitor, comprising:

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