A coal dust suppressant and preparation method thereof

Abstract

The invention discloses a coal dust suppressant and a preparation method thereof, wherein the coal dust suppressant comprises component A and component B, wherein the mass ratio of component A to component B is (0.95-1.05): (0.95-1.05); component A comprises the following components in mass fractions: 10-15 parts of modified carboxymethyl cellulose, 10-15 parts of silica sol, 6-10 parts of polyether polyols, 3-6 parts of isocyanates, and 1-3 parts of surfactants; component B comprises the following components in mass fractions: 40-50 parts of tap water, and 0.05-0.1 parts of catalysts. The dust suppressant in the present invention has high permeability and strong crusting ability, and has good dust suppression effect, and can effectively avoid dust pollution of coal during mining, storage and transportation.

Description

Technical Field

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

[0002] With the continuous mining of open-pit coal mines, most of my country's open-pit coal mines have entered the stage of sunken mining, which requires large vehicles for transportation. There are serious dust problems in the coal piles and mechanical operation areas in the open-pit mines. Excessive dust in the open-pit mines will significantly reduce the sight distance and affect driving safety. In addition, high-concentration dust will seriously affect the health of workers and cause occupational diseases. Therefore, dust control in open-pit mines has become a top priority.

[0003] Conventional methods of dust suppression mainly include: adding protective nets, sprinkling water to suppress dust, and spraying dust suppressants to suppress dust. Considering the dust suppression effect and control cost, spraying dust suppressants to suppress dust is the best control method at present. At present, the most widely used chemical dust suppressants in open-pit coal mines are mainly polymer dust suppressants, whose main component is carboxymethyl cellulose, which is compounded with certain additives. However, since carboxymethyl cellulose is a swellable cellulose and has a high viscosity after being dissolved in water, the biggest problem with this type of dust suppressant system is that it is difficult to balance permeability and crust strength. When the viscosity of this type of dust suppression solution is large, the dust suppression effect is better after spraying, but the penetration speed is slow, which is particularly obvious in the absence of light or low temperature environment; when the viscosity is low, the penetration speed is fast, but the crust thickness is small, the strength is low, and the dust suppression effect is poor. In addition, another problem with this type of dust suppressant is that the crusting speed is seriously dependent on temperature. After spraying in the absence of light or at low temperature, the crusting speed is very slow. Therefore, open-pit coal mines are in urgent need of a dust suppressant with high permeability and strong crusting. Summary of the invention

[0004] The present invention aims to solve one of the technical problems in the related art at least to a certain extent. To this end, the embodiment of the present invention provides a coal dust suppressant and a preparation method thereof.

[0005] In one aspect, an embodiment of the present invention provides a coal dust suppressant, comprising a component A and a component B, wherein the mass ratio of the component A to the component B is (0.95-1.05):(0.95-1.05);

[0006] The component A comprises the following components in parts by weight: 10-15 parts of modified carboxymethyl cellulose, 10-15 parts of silica sol, 6-10 parts of polyether polyol, 3-6 parts of isocyanate, and 1-3 parts of surfactant;

[0007] The B component includes the following components in parts by weight: 40-50 parts of tap water and 0.05-0.1 parts of a catalyst.

[0008] The embodiments of the present invention optimize the composition of the dust suppressant so that it has high permeability and strong crusting ability, and has a good dust suppression effect, which can effectively avoid dust pollution during coal mining, storage and transportation.

[0009] In some embodiments, the modified carboxymethyl cellulose is prepared by a method comprising the following steps:

[0010] S1, mixing sodium carboxymethyl cellulose and sulfuric acid solution, and obtaining carboxymethyl cellulose after suction filtration;

[0011] S2, washing the carboxymethyl cellulose obtained in step S1 with water, stirring and filtering; then washing with acetic acid, filtering; and then washing with butyric acid, filtering;

[0012] S3, activating the carboxymethyl cellulose obtained after washing in step S2, and then adding a mixed solution of acetic anhydride, butyric anhydride and concentrated sulfuric acid to the carboxymethyl cellulose after the temperature drops to 0-5° C., and performing a heating reaction;

[0013] S4, adding an aqueous solution of acetic acid to the reaction product obtained in step S3 to carry out a temperature reaction; then adding a mixed solution of magnesium acetate, acetic acid and deionized water, then adding the mixture into water to stir and precipitate, washing with water, and drying to obtain the modified carboxymethyl cellulose.

[0014] Further, in the step S1, the mass ratio of the sodium carboxymethyl cellulose to the sulfuric acid solution is (45-55):1, preferably 50:1;

[0015] Preferably, the concentration of the sulfuric acid solution is 0.05-0.2 mol / L, preferably 0.1 mol / L;

[0016] And / or, the stirring and mixing temperature is room temperature, and the stirring and mixing time is 20-30 minutes.

[0017] Furthermore, in step S3, the temperature of the activation treatment is 25-30° C., and the time of the activation treatment is 1-3 hours;

[0018] And / or, the mass ratio of the acetic anhydride, the butyric anhydride and the concentrated sulfuric acid is 1:(1.5-2.5):1, preferably 1:2:1;

[0019] And / or, the heating reaction process is: first heating to 55-65° C., reacting for 1.5-2 hours; then heating to 70-75° C., reacting for 0.5-1 hour.

[0020] Furthermore, in step S4, the temperature of the temperature-raising reaction is 80-90° C., and the reaction time is 2-3 h;

[0021] And / or, the mass ratio of the magnesium acetate, the acetic acid and the deionized water is 10:20:(65-75), preferably 10:20:70;

[0022] And / or, the drying temperature is 80-100° C. and the drying time is 0.5-2 h.

[0023] In some embodiments, the polyether polyol includes a mixture of ED-28 and MN-3050DF;

[0024] Preferably, the mass ratio of the ED-28 to the MN-3050DF is (1.5-2.5):(2.5-3.5), preferably 2:3.

[0025] In some embodiments, the isocyanate includes one of dicyclohexylmethane diisocyanate, lysine diisocyanate, or a mixture of both.

[0026] In some embodiments, the surfactant includes at least one of alkyl glycosides APG0810, APG1214, APG0814, APG0816, and APG1216.

[0027] In some embodiments, the catalyst comprises a mixture of 2-amino-fluorobenzylamine and bismuth isooctanoate;

[0028] Preferably, the mass ratio of the 2-amino-fluorobenzylamine to the bismuth isooctanoate is (1.5-2.5):(0.5-1.5), preferably 2:1.

[0029] Another aspect of the present invention is to provide a method for preparing a coal dust suppressant, comprising the following steps:

[0030] The modified carboxymethyl cellulose, silica sol, polyether polyol, isocyanate and surfactant are mixed to obtain component A;

[0031] Mix tap water and the catalyst to obtain component B.

[0032] The above-mentioned characteristics and advantages described for the coal dust suppressant are also applicable to the preparation method of the coal dust suppressant, and will not be repeated here.

[0033] The advantages and beneficial effects of the embodiments of the present invention are as follows:

[0034] 1) In the absence of light, the dust suppressant in the embodiment of the present invention takes about 5-6 minutes to dry on the surface after being sprayed, while the traditional carboxymethyl cellulose dust suppressant takes about 60-90 minutes, and the penetration speed is increased by 10 times;

[0035] 2) The thickness of the crust of the conventional carboxymethyl cellulose dust suppressant is about 5 mm, while the thickness of the crust of the dust suppressant in the embodiment of the present invention is about 20 mm, which is 4 times higher;

[0036] 3) The shell of the dust suppressant in the embodiment of the present invention has high strength after being crusted, and has certain toughness, and its wind erosion rate is less than 0.3%, which is smaller than the wind erosion rate of the traditional carboxymethyl cellulose dust suppressant of about 1%, and the dust suppression effect is better;

[0037] 4) The dust suppressant in the embodiment of the present invention has a self-generated heat function, and the crusting is less affected by light and temperature, and can still form a crust quickly at low temperatures. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the embodiment of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below. Obviously, the described embodiment is a part of the embodiment of the present invention, not all the embodiments. Based on the described embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work belong to the protection scope of the present invention.

[0039] Unless otherwise defined, technical or scientific terms used in the present invention shall have the common meanings understood by those having ordinary skills in the field to which the present invention belongs.

[0040] Where values ​​are described herein as a range, it should be understood that such disclosure includes disclosure of all possible sub-ranges within that range, as well as specific values ​​falling within that range, regardless of whether a specific value or a specific sub-range is explicitly stated.

[0041] Herein, the words "comprises" and "includes" and variations thereof mean that other elements or integers which are permitted but not specifically described may be included.

[0042] In this article, the term "and / or" is merely a term used to describe the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B may represent three situations: A exists alone, A and B exist at the same time, and B exists alone.

[0043] In one aspect, an embodiment of the present invention provides a coal dust suppressant, comprising a component A and a component B, wherein the mass ratio of the component A to the component B is (0.95-1.05):(0.95-1.05);

[0044] The component A comprises the following components in parts by weight: 10-15 parts of modified carboxymethyl cellulose, 10-15 parts of silica sol, 6-10 parts of polyether polyol, 3-6 parts of isocyanate, and 1-3 parts of surfactant;

[0045] The B component includes the following components in parts by weight: 40-50 parts of tap water and 0.05-0.1 parts of a catalyst.

[0046] When the dust suppressant in the embodiment of the present invention is actually used, it is only necessary to mix the two components A and B evenly, dilute them 50-100 times on site, and then spray them quickly. After spraying, the dust suppressant will form a sandwich structure, including a surface layer, a middle layer and a bottom layer, wherein the surface layer is a polyurethane structure with high strength and certain toughness; the middle layer is a cellulose cement; and the bottom layer is a silica polymer network. The reaction mechanism is mainly that after the two components A and B are mixed and sprayed on the surface of the coal powder, the silica sol component will quickly penetrate into the bottom layer due to its structural characteristics, followed by partial penetration of modified carboxymethyl cellulose; at the same time, in the top layer, isocyanate and polyether polyol will quickly solidify under the action of the catalyst and release CO2 gas. Under the pressure of CO2 gas, the modified carboxymethyl cellulose will further penetrate and connect with the silica sol; and because isocyanate and polyether polyol will release heat when reacting, the heat is just used for the consolidation of modified carboxymethyl cellulose and silica sol. In addition, since both modified carboxymethyl cellulose and silica sol contain a large amount of hydroxyl groups that can react with isocyanate, the surface layer, middle layer and bottom layer form a polymer interpenetrating network with high strength.

[0047] In some embodiments, the modified carboxymethyl cellulose is prepared by a method comprising the following steps:

[0048] S1, mixing sodium carboxymethyl cellulose and sulfuric acid solution, and obtaining carboxymethyl cellulose after suction filtration;

[0049] S2, washing the carboxymethyl cellulose obtained in step S1 with water, stirring and filtering; then washing with acetic acid, filtering; and then washing with butyric acid, filtering;

[0050] S3, activating the carboxymethyl cellulose obtained after washing in step S2, and then adding a mixed solution of acetic anhydride, butyric anhydride and concentrated sulfuric acid to the carboxymethyl cellulose after the temperature drops to 0-5° C., and performing a heating reaction;

[0051] S4, adding an aqueous solution of acetic acid to the reaction product obtained in step S3 to carry out a temperature reaction; then adding a mixed solution of magnesium acetate, acetic acid and deionized water, then adding the mixture into water to stir and precipitate, washing with water, and drying to obtain the modified carboxymethyl cellulose.

[0052] Further, in the step S1, the mass ratio of the sodium carboxymethyl cellulose to the sulfuric acid solution is (45-55):1, non-limiting examples include: 45:1, 48:1, 50:1, 55:1, etc., preferably 50:1;

[0053] Preferably, the concentration of the sulfuric acid solution is 0.05-0.2 mol / L, non-limiting examples include: 0.05 mol / L, 0.1 mol / L, 0.15 mol / L, 0.2 mol / L, etc., preferably 0.1 mol / L;

[0054] And / or, the stirring and mixing temperature is room temperature, and the stirring and mixing time is 20-30 min, non-limiting examples include: 20 min, 25 min, 30 min, etc.

[0055] Further, in step S3, the temperature of the activation treatment is 25-30°C, non-limiting examples include: 25°C, 28°C, 30°C, etc.; the time of the activation treatment is 1-3h, non-limiting examples include: 1h, 2h, 3h, etc.;

[0056] And / or, the mass ratio of the acetic anhydride, the butyric anhydride and the concentrated sulfuric acid is 1:(1.5-2.5):1, non-limiting examples include: 1:1.5:1, 1:1.8:1, 1:2:1, 1:2.5:1, etc., preferably 1:2:1;

[0057] And / or, the heating reaction process is: first heating to 55-65° C., reacting for 1.5-2 hours; then heating to 70-75° C., reacting for 0.5-1 hour.

[0058] Further, in step S4, the reaction temperature of the temperature-raising reaction is 80-90° C., non-limiting examples include: 80° C., 85° C., 90° C., etc.; the reaction time is 2-3h, non-limiting examples include: 2h, 2.5h, 3h, etc.;

[0059] And / or, the mass ratio of the magnesium acetate, the acetic acid and the deionized water is 10:20:(65-75), non-limiting examples include: 10:20:65, 10:20:70, 10:20:72, 10:20:75, etc., preferably 10:20:70;

[0060] And / or, the drying temperature is 80-100°C, non-limiting examples include 80°C, 85°C, 90°C, 100°C, etc.; the drying time is 0.5-2h, non-limiting examples include 0.5h, 1h, 2h, etc.

[0061] The embodiments of the present invention modify the carboxymethyl cellulose so that more active functional groups can be grafted into its structure, which is beneficial to increase its solubility and its reactivity with isocyanate, thereby improving its mechanical toughness and crust strength.

[0062] In some embodiments, the polyether polyol includes a mixture of ED-28 (purchased from Shandong Bluestar Dongda Co., Ltd.) and MN-3050DF (purchased from Shandong Bluestar Dongda Co., Ltd.);

[0063] Preferably, the mass ratio of the ED-28 to the MN-3050DF is (1.5-2.5):(2.5-3.5), non-limiting examples include: 1.5:2.5, 1.8:3, 2:3, 2.5:3.5, etc., preferably 2:3.

[0064] ED-28 and MN-3050DF are both low-saturation, 3000 molecular weight polypropylene oxide ether triols. By compounding the two, it is beneficial to increase the tensile strength and toughness of the solid; and the embodiment of the present invention controls the mass ratio of ED-28 to MN-3050DF within the range of (1.5-2.5): (2.5-3.5), which is more conducive to giving play to the structural advantages of the two polyether polyols and achieving synergistic enhancement.

[0065] In some embodiments, the isocyanate includes one of dicyclohexylmethane diisocyanate, lysine diisocyanate, or a mixture of both.

[0066] In some embodiments, the surfactant includes at least one of alkyl glycosides APG0810, APG1214, APG0814, APG0816, and APG1216.

[0067] In some embodiments, the catalyst comprises a mixture of 2-amino-fluorobenzylamine and bismuth isooctanoate;

[0068] Preferably, the mass ratio of the 2-amino-fluorobenzylamine to the bismuth isooctanoate is (1.5-2.5):(0.5-1.5), non-limiting examples include: 1.5:0.5, 1.8:1.2, 2:1, 2.5:1.5, etc., preferably 2:1.

[0069] 2-amino-fluorobenzylamine is used as an organic amine catalyst, and its selectivity to foaming reaction is strong, and bismuth isooctanoate is used as an organic metal bismuth, and its selectivity to gel reaction is stronger, and by using the two in a composite, it is beneficial to balance foaming reaction and gel reaction. And the inventors found through research that if the addition amount of 2-amino-fluorobenzylamine is too much, foaming will be caused to be obvious, and the strength of the solidified material will decrease; but if the content of bismuth isooctanoate is too much, the gel will be made strong, resulting in poor permeability, therefore, the mass ratio of 2-amino-fluorobenzylamine and bismuth isooctanoate controlled by the embodiment of the present invention is (1.5-2.5): (0.5-1.5) is favorable.

[0070] Another aspect of the present invention is to provide a method for preparing a coal dust suppressant, comprising the following steps:

[0071] The modified carboxymethyl cellulose, silica sol, polyether polyol, isocyanate and surfactant are mixed to obtain component A;

[0072] Mix tap water and the catalyst to obtain component B.

[0073] The following are non-limiting examples and comparative examples of the present invention. It should be noted that the schemes of the comparative examples are not prior art and are only provided for comparison with the schemes of the embodiments and are not intended to limit the present invention. Unless otherwise specified, the various raw materials used in the embodiments and comparative examples are conventional commercial products or can be prepared by known methods.

[0074] It should be noted that the modified carboxymethyl cellulose in the following examples and comparative examples is prepared by the following steps:

[0075] S1, weigh 10g of sodium carboxymethyl cellulose, add 0.2g of sulfuric acid solution (0.1mol / L), stir and mix at room temperature for 30min, and filter to obtain carboxymethyl cellulose;

[0076] S2, the carboxymethyl cellulose obtained in step S1 is first washed with 500 mL of water for 30 minutes by stirring, and then filtered; then washed three times with 500 mL of acetic acid, and then filtered; then washed three times with 500 mL of butyric acid, and then filtered; this washing process is used to remove sulfuric acid, water, and acetic acid respectively;

[0077] S3, placing the carboxymethyl cellulose obtained after washing in step S2 into a 1000 mL three-necked flask and activating it at 25° C. for 2 h, then waiting for the temperature to drop to about 5° C., adding a mixture of 3 g acetic anhydride, 6 g butyric anhydride and 3 g concentrated sulfuric acid into the three-necked flask, then slowly heating it to 60° C., reacting for 1.5 h, and then heating it to 70° C., reacting for 1 h. After the reaction is completed, the reaction product system presents a transparent viscous substance;

[0078] S4, 2g of acetic acid is prepared into a 50wt% aqueous solution, and slowly added to the reaction product obtained in step S3 (the dropwise addition is completed in about 10min), then the temperature is raised to 85°C and the reaction is carried out for 2h; then a mixed solution of 7g of magnesium acetate, 14g of acetic acid and 49g of deionized water is added to neutralize the sulfuric acid catalyst; then the mixture is slowly added to a large amount of stirred water for precipitation, and washed with water twice, and finally dried at 90°C for 1h to obtain modified carboxymethyl cellulose.

[0079] Example 1

[0080] This embodiment provides a coal dust suppressant, comprising a component A and a component B, wherein the mass ratio of the component A to the component B is 1:1;

[0081] Component A includes the following components in parts by weight: 10 parts of modified carboxymethyl cellulose, 15 parts of silica sol, 8 parts of polyether polyol, 4 parts of isocyanate, and 1 part of surfactant;

[0082] Component B includes the following components in parts by mass: 45 parts of tap water and 0.06 parts of catalyst.

[0083] In this embodiment, the polyether polyol is a mixture of ED-28 and MN-3050DF, and the mass ratio thereof is 2:3.

[0084] In this embodiment, the isocyanate is a mixture of dicyclohexylmethane diisocyanate and lysine diisocyanate, and the mass ratio thereof is 1:1.

[0085] In this embodiment, the surfactant is APG0810.

[0086] In this embodiment, the catalyst is a mixture of 2-amino-fluorobenzylamine and bismuth isooctanoate, and the mass ratio thereof is 2:1.

[0087] Example 2

[0088] This embodiment provides a coal dust suppressant, comprising a component A and a component B, wherein the mass ratio of the component A to the component B is 1:1;

[0089] Component A includes the following components in parts by weight: 15 parts of modified carboxymethyl cellulose, 10 parts of silica sol, 6 parts of polyether polyol, 5 parts of isocyanate, and 1 part of surfactant;

[0090] Component B includes the following components in parts by mass: 45 parts of tap water and 0.06 parts of catalyst.

[0091] In this embodiment, the polyether polyol is a mixture of ED-28 and MN-3050DF, and the mass ratio thereof is 2:3.

[0092] In this embodiment, the isocyanate is a mixture of dicyclohexylmethane diisocyanate and lysine diisocyanate, and the mass ratio thereof is 1:1.

[0093] In this embodiment, the surfactant is APG0810.

[0094] In this embodiment, the catalyst is a mixture of 2-amino-fluorobenzylamine and bismuth isooctanoate, and the mass ratio thereof is 2:1.

[0095] Example 3

[0096] This embodiment provides a coal dust suppressant, comprising a component A and a component B, wherein the mass ratio of the component A to the component B is 1:1;

[0097] Component A includes the following components in parts by weight: 10 parts of modified carboxymethyl cellulose, 15 parts of silica sol, 8 parts of polyether polyol, 4 parts of isocyanate, and 1 part of surfactant;

[0098] Component B includes the following components in parts by mass: 50 parts of tap water and 0.1 parts of catalyst.

[0099] In this embodiment, the polyether polyol is a mixture of ED-28 and MN-3050DF, and the mass ratio thereof is 2:3.

[0100] In this embodiment, the cyanate is a mixture of dicyclohexylmethane diisocyanate and lysine diisocyanate, and the mass ratio thereof is 1:1.

[0101] In this embodiment, the surfactant is alkyl polyglycoside APG0810.

[0102] In this embodiment, the catalyst is a mixture of 2-amino-fluorobenzylamine and bismuth isooctanoate, and the mass ratio thereof is 2:1.

[0103] Example 4

[0104] This embodiment provides a coal dust suppressant, comprising a component A and a component B, wherein the mass ratio of the component A to the component B is 1:1;

[0105] Component A includes the following components in parts by weight: 10 parts of modified carboxymethyl cellulose, 15 parts of silica sol, 8 parts of polyether polyol, 4 parts of isocyanate, and 1 part of surfactant;

[0106] Component B includes the following components in parts by mass: 45 parts of tap water and 0.06 parts of catalyst.

[0107] In this embodiment, the polyether polyol is a mixture of ED-28 and MN-3050DF, and the mass ratio thereof is 2.5:3.5.

[0108] In this embodiment, the isocyanate is a mixture of dicyclohexylmethane diisocyanate and lysine diisocyanate, and the mass ratio thereof is 1:1.

[0109] In this embodiment, the surfactant is APG0810.

[0110] In this embodiment, the catalyst is a mixture of 2-amino-fluorobenzylamine and bismuth isooctanoate, and the mass ratio thereof is 2:1.

[0111] Example 5

[0112] This embodiment provides a coal dust suppressant, comprising a component A and a component B, wherein the mass ratio of the component A to the component B is 1:1;

[0113] Component A includes the following components in parts by weight: 10 parts of modified carboxymethyl cellulose, 15 parts of silica sol, 8 parts of polyether polyol, 4 parts of isocyanate, and 1 part of surfactant;

[0114] Component B includes the following components in parts by mass: 45 parts of tap water and 0.06 parts of catalyst.

[0115] In this embodiment, the polyether polyol is a mixture of ED-28 and MN-3050DF, and the mass ratio thereof is 2:3.

[0116] In this embodiment, the isocyanate is dicyclohexylmethane diisocyanate.

[0117] In this embodiment, the surfactant is APG0810.

[0118] In this embodiment, the catalyst is a mixture of 2-amino-fluorobenzylamine and bismuth isooctanoate, and the mass ratio thereof is 2:1.

[0119] Comparative Example 1

[0120] This comparative example provides a coal dust suppressant, comprising 50 parts of carboxymethyl cellulose, 20 parts of polyether polyol, 25 parts of tap water and 5 parts of surfactant;

[0121] Among them, the polyether polyol is HSH330;

[0122] The surfactant is a mixture of APG1214 and APG0814, and the mass ratio thereof is 2:1.

[0123] Comparative Example 2

[0124] This comparative example provides a coal dust suppressant, comprising component A and component B, wherein the mass ratio of component A to component B is 1:1;

[0125] Component A includes the following components in parts by weight: 10 parts of carboxymethyl cellulose, 15 parts of silica sol, 8 parts of polyether polyol, 4 parts of isocyanate, and 1 part of surfactant;

[0126] Component B includes the following components in parts by mass: 45 parts of tap water and 0.06 parts of catalyst.

[0127] In this comparative example, the polyether polyol is a mixture of ED-28 and MN-3050DF, and the mass ratio thereof is 2:3.

[0128] In this comparative example, the isocyanate is a mixture of dicyclohexylmethane diisocyanate and lysine diisocyanate, and the mass ratio thereof is 1:1.

[0129] In this comparative example, the surfactant is APG0810.

[0130] In this comparative example, the catalyst is a mixture of 2-amino-fluorobenzylamine and bismuth isooctanoate, and the mass ratio thereof is 2:1.

[0131] Comparative Example 3

[0132] This comparative example provides a coal dust suppressant, comprising component A and component B, wherein the mass ratio of component A to component B is 1:1;

[0133] Wherein, component A includes the following components in parts by weight: 10 parts of modified carboxymethyl cellulose, 15 parts of silica sol, and 1 part of surfactant;

[0134] Component B includes the following components in parts by mass: 45 parts of tap water and 0.06 parts of catalyst.

[0135] In this comparative example, the surfactant is APG0810.

[0136] In this comparative example, the catalyst is a mixture of 2-amino-fluorobenzylamine and bismuth isooctanoate, and the mass ratio thereof is 2:1.

[0137] The dust suppressants prepared in the above examples and comparative examples were tested for performance, and the results are shown in Table 1:

[0138] Table 1

[0139]

[0140]

[0141] It can be seen from Table 1 that, compared with the dust suppressant in the comparative example, the dust suppressant in the embodiment of the present invention has high permeability and low wind erosion rate, and its crust thickness is thicker, and the crust is less affected by light and temperature, indicating that it has good dust suppression ability.

[0142] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0143] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A coal dust suppressant, characterized in that: Comprising component A and component B, wherein the mass ratio of component A to component B is (0.95-1.05):(0.95-1.05); The component A comprises the following components in parts by weight: 10-15 parts of modified carboxymethyl cellulose, 10-15 parts of silica sol, 6-10 parts of polyether polyol, 3-6 parts of isocyanate, and 1-3 parts of surfactant; The B component includes the following components in parts by weight: 40-50 parts of tap water and 0.05-0.1 parts of a catalyst; The modified carboxymethyl cellulose is prepared by a method comprising the following steps: S1, mixing sodium carboxymethyl cellulose and sulfuric acid solution, and obtaining carboxymethyl cellulose after suction filtration; S2, washing the carboxymethyl cellulose obtained in step S1 with water, stirring, and filtering; and then washing with acetic acid, and filtering; Then use butyric acid to wash and filter; S3, activating the carboxymethyl cellulose obtained after washing in step S2, and then adding a mixed solution of acetic anhydride, butyric anhydride and concentrated sulfuric acid to the carboxymethyl cellulose after the temperature drops to 0-5° C., and performing a heating reaction; S4, adding an aqueous solution of acetic acid to the reaction product obtained in step S3 to carry out a temperature reaction; then adding a mixed solution of magnesium acetate, acetic acid and deionized water, then adding the mixture into water to stir and precipitate, washing with water, and drying to obtain the modified carboxymethyl cellulose.

2. The coal dust suppressant according to claim 1, characterized in that: In the step S1, the mass ratio of the sodium carboxymethyl cellulose to the sulfuric acid solution is (45-55):

1.

3. The coal dust suppressant according to claim 1, characterized in that: The concentration of the sulfuric acid solution is 0.05-0.2 mol / L; And / or, the stirring and mixing temperature is room temperature, and the stirring and mixing time is 20-30 minutes.

4. The coal dust suppressant according to claim 1, characterized in that: In step S3, the temperature of the activation treatment is 25-30° C., and the time of the activation treatment is 1-3 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; And / or, the heating reaction process is: first heating to 55-65° C., reacting for 1.5-2 hours; then heating to 70-75° C., reacting for 0.5-1 hour.

5. The coal dust suppressant according to claim 1, characterized in that: In the step S4, the temperature of the temperature-raising reaction is 80-90° C., and the reaction time is 2-3 hours; And / or, the mass ratio of the magnesium acetate, the acetic acid and the deionized water is 10:20:(65-75); And / or, the drying temperature is 80-100° C. and the drying time is 0.5-2 h.

6. The coal dust suppressant according to claim 1, characterized in that: The polyether polyol includes a mixture of ED-28 and MN-3050DF.

7. The coal dust suppressant according to claim 6, characterized in that: The mass ratio of the ED-28 to the MN-3050DF is (1.5-2.5):(2.5-3.5).

8. The coal dust suppressant according to claim 1, characterized in that: The isocyanate includes one of dicyclohexylmethane diisocyanate and lysine diisocyanate or a mixture of the two.

9. The coal dust suppressant according to claim 1, characterized in that: The surfactant includes at least one of alkyl glycosides APG0810, APG1214, APG0814, APG0816, and APG1216.

10. The coal dust suppressant according to claim 1, characterized in that: The catalyst includes a mixture of 2-amino-fluorobenzylamine and bismuth isooctanoate.

11. The coal dust suppressant according to claim 10, characterized in that: The mass ratio of the 2-amino-fluorobenzylamine to the bismuth isooctanoate is (1.5-2.5):(0.5-1.5).

12. A method for preparing the coal dust suppressant according to any one of claims 1 to 10, characterized in that: The steps include: The modified carboxymethyl cellulose, silica sol, polyether polyol, isocyanate and surfactant are mixed to obtain component A; Mix tap water and the catalyst to obtain component B.

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