Composite dust suppressant for coal mine and preparation method of composite dust suppressant

Abstract

The invention relates to a coal mine composite dust suppressant and a preparation method thereof, and relates to the technical field of dust suppression compositions.The coal mine composite dust suppressant is prepared from, by weight, 0.3%-0.7% of modified epoxy resin, 3%-6% of polyhydric alcohol compounds, 0.1%-0.3% of xanthan gum, 0.05%-0.1% of diamine compounds and the like. According to the invention, the bisphenol A type epoxy resin with proper epoxy equivalent is subjected to corona discharge treatment, so that the bisphenol A type epoxy resin is endowed with amphiphilic property, the entanglement consolidation capability of a molecular chain is maintained, and the dispersity of the bisphenol A type epoxy resin in a water phase is enhanced, thereby enhancing the stability of a whole material system; meanwhile, a polyhydric alcohol low-temperature synergistic system is matched, the eutectic point of a solution is reduced through hydrogen bond network construction, all the components are in synergistic interaction, the low-temperature dust suppression effect of the composite dust suppressant for the coal mine is remarkably improved, and the composite dust suppressant is particularly suitable for open-pit coal mines in alpine regions, coal conveying galleries, railway transportation of bulk particles and other scenes.

Description

Technical Field

[0001] The invention relates to the technical field of dust suppression compositions, and in particular to a composite dust suppressant for coal mines and a preparation method thereof. Background Art

[0002] In the process of coal mining and transportation, dust pollution is an environmental problem that needs to be solved urgently. Dust not only pollutes the environment, but also poses a serious threat to the health of miners, such as causing respiratory diseases. Therefore, the application of dust suppressants in the coal mining industry is particularly important.

[0003] At present, there are many dust suppressants for coal mines on the market, which can reduce the generation and flying of dust to a certain extent. However, with the expansion of coal mining scale and the diversification of mining environment, especially in open-pit coal mines and coal transportation corridors in high-cold areas, higher requirements are placed on the performance of dust suppressants.

[0004] In scenarios such as open-pit coal mines and coal transportation corridors in high-cold areas, the use of existing dust suppressants has the following main defects: 1) First, the low temperature environment will cause certain components of the dust suppressant to solidify or lose activity, thus affecting its dust suppression performance. Especially under extreme low temperature conditions, some dust suppressants even lose their effect completely and cannot effectively suppress the flying of dust. This not only aggravates environmental pollution, but also poses a greater threat to the health of miners. 2) Secondly, scenes such as open-pit coal mines, railway transportation of bulk particles and coal transportation corridors in high-cold areas are often accompanied by severe weather conditions such as strong winds and dryness, which makes dust control more difficult, and the dust suppression effect is often poor and cannot meet actual use needs. Summary of the invention

[0005] In order to solve the above problems, the present invention provides a composite dust suppressant for coal mines and a preparation method thereof.

[0006] The technical solution provided by the present invention is as follows: In a first aspect, the present invention provides a composite dust suppressant for coal mines, wherein the composite dust suppressant for coal mines comprises the following components in percentage by weight: Modified epoxy resin 0.3~0.7%, polyol compound 3~6%, xanthan gum 0.1~0.3%, diamine compound 0.05~0.1%, carboxymethyl cellulose 0.8~1.5%, surfactant 0.3~0.8%, polyvinyl alcohol 0.1~0.4%, and the balance is water; The modified epoxy resin is obtained by subjecting a bisphenol A epoxy resin having an epoxy equivalent of 800 to 900 g / eq to corona discharge treatment; The polyol compound is composed of glycerol, pentaerythritol and erythritol.

[0007] Furthermore, the composite dust suppressant for coal mines comprises the following components in percentage by weight: 0.5% modified epoxy resin, 4.5% polyol compound, 0.2% xanthan gum, 0.08% diamine compound, 1.1% carboxymethyl cellulose, 0.5% surfactant, 0.3% polyvinyl alcohol, and the balance is water.

[0008] Furthermore, the preparation method of the modified epoxy resin comprises the following process: The bisphenol A epoxy resin is subjected to 7-13 kV / m 2 The modified epoxy resin is obtained by performing corona discharge treatment for 15 to 35 seconds under the following conditions.

[0009] Furthermore, the polyol compound is composed of propylene glycol, pentaerythritol and erythritol in a weight ratio of (7-11):(1-2):(3-6).

[0010] Furthermore, the polyol compound is composed of propylene glycol, pentaerythritol and erythritol in a weight ratio of 8:1:5.

[0011] Furthermore, the diamine compound includes at least one of ethylenediamine and meta-xylylenediamine.

[0012] Furthermore, the surfactant includes at least one of sodium dodecylbenzene sulfonate and cocamidopropyl betaine.

[0013] In the second aspect, based on the same inventive concept, the present invention provides a method for preparing the composite dust suppressant for coal mines according to any one of the first aspects, the preparation method comprising the following steps: adding a surfactant into water and mechanically stirring the water to obtain a mixture; The remaining components are added to the mixture and ultrasonically stirred to obtain the composite dust suppressant for coal mines.

[0014] Furthermore, the working condition parameters of the mechanical stirring include: a stirring speed of 500-800 rpm, and a stirring time of 5-10 minutes; the working condition parameters of the ultrasonic stirring include: an ultrasonic power of 800-900 W, a stirring speed of 400-600 rpm, and a stirring time of 5-10 minutes.

[0015] The above technical solution provided by the embodiment of the present invention has at least the following advantages compared with the prior art: The invention provides a composite dust suppressant for coal mines and a preparation method thereof. The invention mainly performs corona discharge treatment on a bisphenol A epoxy resin with a suitable epoxy equivalent to impart amphiphilic properties to the resin, thereby maintaining the entanglement and consolidation ability of the molecular chains and enhancing the dispersibility thereof in the aqueous phase, thereby enhancing the stability of the entire material system. At the same time, a polyol low-temperature synergistic system is used to lower the eutectic point of the solution through hydrogen bond network construction, and the components synergize with each other, thereby significantly improving the low-temperature dust suppression effect of the composite dust suppressant for coal mines obtained. The composite dust suppressant is particularly suitable for scenes such as open-pit coal mines in alpine areas, coal transportation corridors, and railway transportation of bulk particulate matter, and makes up for the shortcomings of existing dust suppressants. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0018] Figure 1 The present invention is a flow chart of a method for preparing a composite dust suppressant for coal mines. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] Unless otherwise specified, various raw materials, reagents, instruments and equipment used in the present invention can be purchased from the market or prepared by existing methods.

[0021] In a first aspect, the present invention provides a composite dust suppressant for coal mines, wherein the composite dust suppressant for coal mines comprises the following components in percentage by weight: Modified epoxy resin 0.3~0.7%, polyol compound 3~6%, xanthan gum 0.1~0.3%, diamine compound 0.05~0.1%, carboxymethyl cellulose 0.8~1.5%, surfactant 0.3~0.8%, polyvinyl alcohol 0.1~0.4%, and the balance is water; The modified epoxy resin is obtained by subjecting a bisphenol A epoxy resin having an epoxy equivalent of 800 to 900 g / eq to corona discharge treatment; The polyol compound is composed of glycerol, pentaerythritol and erythritol.

[0022] The invention provides a composite dust suppressant for coal mines. The invention mainly performs corona discharge treatment on a bisphenol A epoxy resin with a suitable epoxy equivalent to impart amphiphilic properties to the resin, thereby maintaining the entanglement and consolidation ability of the molecular chains and enhancing the dispersibility thereof in the aqueous phase, thereby enhancing the stability of the entire material system. At the same time, a polyol low-temperature synergistic system is used to lower the eutectic point of the solution through hydrogen bond network construction, and the components synergize with each other, thereby significantly improving the low-temperature dust suppression effect of the composite dust suppressant for coal mines obtained. The composite dust suppressant is particularly suitable for scenes such as open-pit coal mines in high-cold areas, coal transportation corridors, and railway transportation of bulk particulate matter, and makes up for the shortcomings of existing dust suppressants.

[0023] In some specific embodiments, the composite dust suppressant for coal mines comprises the following components by weight percentage: 0.5% modified epoxy resin, 4.5% polyol compound, 0.2% xanthan gum, 0.08% diamine compound, 1.1% carboxymethyl cellulose, 0.5% surfactant, 0.3% polyvinyl alcohol, and the balance is water.

[0024] In some specific embodiments, the preparation method of the modified epoxy resin includes the following process: The bisphenol A epoxy resin is subjected to 7-13 kV / m 2 Preferably, the bisphenol A epoxy resin is subjected to corona discharge treatment for 15 to 35 seconds at 10 kV / m 2 The modified epoxy resin was obtained by performing corona discharge treatment for 25 seconds under the following conditions.

[0025] In some specific embodiments, the polyol compound is composed of propylene glycol, pentaerythritol and erythritol in a weight ratio of (7-11):(1-2):(3-6).

[0026] In some specific embodiments, the polyol compound is composed of glycerol, pentaerythritol and erythritol in a weight ratio of 8:1:5.

[0027] In some specific embodiments, the diamine compound includes at least one of ethylenediamine and meta-xylylenediamine.

[0028] In some specific embodiments, the surfactant includes at least one of sodium dodecylbenzene sulfonate and cocamidopropyl betaine.

[0029] In the second aspect, based on the same inventive concept, the present invention provides a method for preparing the composite dust suppressant for coal mines as described in any one of the first aspects, such as Figure 1 As shown, the preparation method comprises the following steps: adding a surfactant into water and mechanically stirring the water to obtain a mixture; The remaining components are added to the mixture and ultrasonically stirred to obtain the composite dust suppressant for coal mines.

[0030] The present invention provides a method for preparing a composite dust suppressant for coal mines. The method is simple to operate, does not require additional specific equipment, and is suitable for mass industrial production. At the same time, the method is implemented based on the composite dust suppressant for coal mines described in any one of the first aspects, and therefore has at least the beneficial effects of the composite dust suppressant for coal mines described in any one of the first aspects, which will not be described in detail here.

[0031] In some specific embodiments, the working condition parameters of the mechanical stirring include: a stirring speed of 500~800rpm, and a stirring time of 5~10 minutes; the working condition parameters of the ultrasonic stirring include: an ultrasonic power of 800~900W, a stirring speed of 400~600rpm, and a stirring time of 5~10 minutes.

[0032] It should be noted that the raw materials involved in the composite dust suppressant for coal mines provided by the present invention and the preparation method thereof, unless otherwise specified or specifically described, can be directly commercially available products or homemade according to the preparation process disclosed in the prior art. For example, the following embodiments and comparative examples use bisphenol A epoxy resin with product model NPES-904H (epoxy equivalent of 840-900 g / eq), bisphenol A epoxy resin with product model NPES-604 (epoxy equivalent of 800-850 g / eq) or bisphenol A epoxy resin with product model DER671 662E 663U (epoxy equivalent of 590-630 g / eq); at the same time, the operating steps and condition parameters involved, unless otherwise specified or specifically described, can be carried out according to the existing dust suppressant preparation process or using existing equipment, and the present invention document will not repeat them one by one.

[0033] The present invention will be further described below in conjunction with specific examples. It should be understood that these examples are intended only to illustrate the present invention and are not intended to limit the scope of the present invention. The experimental methods in the following examples that do not specify specific conditions are usually measured according to national standards. If there is no corresponding national standard, then the conditions recommended by the manufacturer are followed.

[0034] Example 1 This example provides a composite dust suppressant for coal mines, which comprises the following components in terms of weight percentage: Modified epoxy resin 0.5%, polyol compound 4.5%, xanthan gum 0.2%, diamine compound 0.08%, carboxymethyl cellulose 1.1%, surfactant 0.5%, polyvinyl alcohol 0.3%, the balance is water; The modified epoxy resin is obtained by subjecting a bisphenol A epoxy resin having an epoxy equivalent of 840-900 g / eq to corona discharge treatment. The specific preparation method comprises the following steps: subjecting the bisphenol A epoxy resin to a corona discharge treatment at 10 kV / m 2 The modified epoxy resin is obtained by subjecting the mixture to a corona discharge treatment for 20 seconds under the following conditions: The polyol compound is composed of glycerol, pentaerythritol and erythritol in a weight ratio of 8:1:5; The diamine compound is ethylenediamine; The surfactant is sodium dodecylbenzene sulfonate.

[0035] The preparation method of the composite dust suppressant for coal mines provided above comprises the following steps: Adding a surfactant into water and mechanically stirring the mixture at a stirring speed of 750 rpm for 8 minutes to obtain a mixture; The remaining components are added to the mixture for ultrasonic stirring. The ultrasonic power is 850 W, the stirring speed is 500 rpm, and the stirring time is 7 minutes to obtain the composite dust suppressant for coal mines.

[0036] Example 2 This example provides a composite dust suppressant for coal mines, which comprises the following components in terms of weight percentage: Modified epoxy resin 0.3%, polyol compound 3%, xanthan gum 0.1%, diamine compound 0.05%, carboxymethyl cellulose 0.8%, surfactant 0.3%, polyvinyl alcohol 0.1%, and the balance is water; The modified epoxy resin is obtained by subjecting a bisphenol A epoxy resin having an epoxy equivalent of 800-850 g / eq to corona discharge treatment. The specific preparation method comprises the following steps: subjecting the bisphenol A epoxy resin to a corona discharge treatment at 7 kV / m 2 The modified epoxy resin is obtained by performing a corona discharge treatment for 35 seconds under the following conditions: The polyol compound is composed of glycerol, pentaerythritol and erythritol in a weight ratio of 11:1:6; The diamine compound is m-xylylenediamine; The surfactant is composed of sodium dodecylbenzene sulfonate and cocamidopropyl betaine in a weight ratio of 3:1.

[0037] The preparation method of the composite dust suppressant for coal mines provided above comprises the following steps: Adding a surfactant into water and mechanically stirring the mixture at a stirring speed of 500 rpm for 10 minutes to obtain a mixture; The remaining components are added to the mixture for ultrasonic stirring, with an ultrasonic power of 800 W, a stirring speed of 400 rpm, and a stirring time of 10 minutes to obtain the composite dust suppressant for coal mines.

[0038] Example 3 This example provides a composite dust suppressant for coal mines, which comprises the following components in terms of weight percentage: Modified epoxy resin 0.7%, polyol compound 6%, xanthan gum 0.3%, diamine compound 0.1%, carboxymethyl cellulose 1.5%, surfactant 0.8%, polyvinyl alcohol 0.4%, and the balance is water; The modified epoxy resin is obtained by subjecting a bisphenol A epoxy resin having an epoxy equivalent of 800-850 g / eq to corona discharge treatment. The specific preparation method comprises the following steps: subjecting the bisphenol A epoxy resin to a corona discharge treatment at 13 kV / m 2 Performing corona discharge treatment for 15 seconds under the conditions to obtain the modified epoxy resin; The polyol compound is composed of glycerol, pentaerythritol and erythritol in a weight ratio of 7:2:3; The diamine compound is ethylenediamine; The surfactant is sodium dodecylbenzene sulfonate.

[0039] The preparation method of the composite dust suppressant for coal mines provided above comprises the following steps: Adding a surfactant into water and mechanically stirring the mixture at a stirring speed of 800 rpm for 5 minutes to obtain a mixture; The remaining components are added to the mixture for ultrasonic stirring. The ultrasonic power is 900 W, the stirring speed is 600 rpm, and the stirring time is 5 minutes to obtain the composite dust suppressant for coal mines.

[0040] Comparative Example 1 This example provides a composite dust suppressant for coal mines, which comprises the following components in terms of weight percentage: Epoxy resin 0.5%, polyol compound 4.5%, xanthan gum 0.2%, diamine compound 0.08%, carboxymethyl cellulose 1.1%, surfactant 0.5%, polyvinyl alcohol 0.3%, the balance is water; The epoxy resin is a bisphenol A type epoxy resin with an epoxy equivalent of 840-900 g / eq; The polyol compound is glycerol; The diamine compound is ethylenediamine; The surfactant is sodium dodecylbenzene sulfonate.

[0041] The preparation method of the composite dust suppressant for coal mine provided above is the same as that in Example 1.

[0042] Comparative Example 2 This example provides a composite dust suppressant for coal mines, which comprises the following components in terms of weight percentage: Modified epoxy resin 0.5%, polyol compound 4.5%, xanthan gum 0.2%, diamine compound 0.08%, carboxymethyl cellulose 1.1%, surfactant 0.5%, polyvinyl alcohol 0.3%, the balance is water; The modified epoxy resin is obtained by subjecting a bisphenol A epoxy resin having an epoxy equivalent of 840-900 g / eq to corona discharge treatment. The specific preparation method comprises the following steps: subjecting the bisphenol A epoxy resin to a corona discharge treatment at 10 kV / m 2 The modified epoxy resin is obtained by subjecting the mixture to a corona discharge treatment for 20 seconds under the following conditions: The polyol compound is glycerol; The diamine compound is ethylenediamine; The surfactant is sodium dodecylbenzene sulfonate.

[0043] The preparation method of the composite dust suppressant for coal mine provided above is the same as that in Example 1.

[0044] Comparative Example 3 This example provides a composite dust suppressant for coal mines, which comprises the following components in terms of weight percentage: Epoxy resin 0.5%, polyol compound 4.5%, xanthan gum 0.2%, diamine compound 0.08%, carboxymethyl cellulose 1.1%, surfactant 0.5%, polyvinyl alcohol 0.3%, the balance is water; The epoxy resin is a bisphenol A type epoxy resin with an epoxy equivalent of 840-900 g / eq; The polyol compound is composed of glycerol, pentaerythritol and erythritol in a weight ratio of 8:1:5; The diamine compound is ethylenediamine; The surfactant is sodium dodecylbenzene sulfonate.

[0045] The preparation method of the composite dust suppressant for coal mine provided above is the same as that in Example 1.

[0046] Comparative Example 4 This example provides a composite dust suppressant for coal mines, which comprises the following components in terms of weight percentage: Modified epoxy resin 0.5%, polyol compound 4.5%, xanthan gum 0.2%, diamine compound 0.08%, carboxymethyl cellulose 1.1%, surfactant 0.5%, polyvinyl alcohol 0.3%, the balance is water; The modified epoxy resin is obtained by subjecting a bisphenol A epoxy resin having an epoxy equivalent of 590-630 g / eq to corona discharge treatment. The specific preparation method comprises the following steps: subjecting the bisphenol A epoxy resin to a corona discharge treatment at 10 kV / m 2 The modified epoxy resin is obtained by subjecting the mixture to a corona discharge treatment for 20 seconds under the following conditions: The polyol compound is composed of glycerol, pentaerythritol and erythritol in a weight ratio of 8:1:5; The diamine compound is ethylenediamine; The surfactant is sodium dodecylbenzene sulfonate.

[0047] The preparation method of the composite dust suppressant for coal mine provided above is the same as that in Example 1.

[0048] Test Case In this example, the dust suppression effect of the composite dust suppressants for coal mines obtained in the above Examples 1 to 3 and Comparative Examples 1 to 4 was measured at -20°C according to the wind erosion test method in "Technical Conditions for Dust Suppression in Railway Coal Transportation Part 1: Dust Suppressants" (TB / T 3201.1-2020). The test results are shown in Table 1.

[0049] Table 1

[0050] From Table 1, we can see that: 1) Compared with comparative examples 1 to 4, the dust suppression effect of the composite dust suppressant for coal mines provided by embodiments 1 to 3 of the present invention at -20°C is greater than 95%, indicating that its low-temperature dust suppression effect is more excellent and can meet the use requirements of open-pit coal mines, coal transportation corridors and other scenes in high-cold areas.

[0051] 2) By comparing the test results of Example 1 and Comparative Examples 1 to 4, it can be seen that the present invention uses a specific modified epoxy resin and a polyol low-temperature synergistic system in combination, and the two synergistically enhance the synergy, thereby improving the low-temperature dust suppression effect of the obtained composite dust suppressant for coal mines.

[0052] In summary, the present invention provides a composite dust suppressant for coal mines and a preparation method thereof. The present invention mainly performs corona discharge treatment on a bisphenol A epoxy resin with a suitable epoxy equivalent to impart amphiphilic properties to it, thereby maintaining the entanglement and consolidation ability of the molecular chains and enhancing its dispersibility in the aqueous phase, thereby enhancing the stability of the entire material system; at the same time, in conjunction with a polyol low-temperature synergistic system, the eutectic point of the solution is lowered through the construction of a hydrogen bond network, and the components synergize with each other, which significantly improves the low-temperature dust suppression effect of the obtained composite dust suppressant for coal mines. The composite dust suppressant is particularly suitable for scenes such as open-pit coal mines in high-cold areas, coal transportation corridors, and railway transportation of bulk particulate matter, making up for the shortcomings of existing dust suppressants.

[0053] Various embodiments of the present invention may be presented in the form of a range; it should be understood that the description in the form of a range is only for convenience and brevity, and should not be understood as a rigid limitation on the scope of the present invention; therefore, the range description should be considered to have specifically disclosed all possible sub-ranges and single numerical values ​​within the range. For example, the range description from 1 to 6 should be considered to have specifically disclosed sub-ranges, such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., as well as single numbers within the range, such as 1, 2, 3, 4, 5 and 6, which are applicable regardless of the range. In addition, whenever a numerical range is indicated herein, it is intended to include any cited number (fractional or integer) within the indicated range.

[0054] The foregoing is merely a specific embodiment of the present invention, which enables those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A composite dust suppressant for coal mines, characterized in that: The composite dust suppressant for coal mines comprises the following components in percentage by weight: Modified epoxy resin 0.3~0.7%, polyol compound 3~6%, xanthan gum 0.1~0.3%, diamine compound 0.05~0.1%, carboxymethyl cellulose 0.8~1.5%, surfactant 0.3~0.8%, polyvinyl alcohol 0.1~0.4%, and the balance is water; The modified epoxy resin is obtained by subjecting a bisphenol A epoxy resin having an epoxy equivalent of 800 to 900 g / eq to corona discharge treatment; The polyol compound is composed of glycerol, pentaerythritol and erythritol.

2. The composite dust suppressant for coal mines according to claim 1, characterized in that: The composite dust suppressant for coal mines comprises the following components in percentage by weight: 0.5% modified epoxy resin, 4.5% polyol compound, 0.2% xanthan gum, 0.08% diamine compound, 1.1% carboxymethyl cellulose, 0.5% surfactant, 0.3% polyvinyl alcohol, and the balance is water.

3. The composite dust suppressant for coal mines according to claim 1, characterized in that: The preparation method of the modified epoxy resin comprises the following process: The bisphenol A epoxy resin is subjected to 7-13 kV / m 2 The modified epoxy resin is obtained by performing corona discharge treatment for 15 to 35 seconds under the following conditions.

4. The composite dust suppressant for coal mines according to claim 1, characterized in that: The polyol compound is composed of propylene glycol, pentaerythritol and erythritol in a weight ratio of (7-11): (1-2): (3-6).

5. The composite dust suppressant for coal mines according to claim 1, characterized in that: The polyol compound is composed of glycerol, pentaerythritol and erythritol in a weight ratio of 8:1:

5.

6. The composite dust suppressant for coal mines according to claim 1, characterized in that: The diamine compound includes at least one of ethylenediamine and meta-xylylenediamine.

7. The composite dust suppressant for coal mines according to claim 1, characterized in that: The surfactant includes at least one of sodium dodecylbenzene sulfonate and cocamidopropyl betaine.

8. A method for preparing the composite dust suppressant for coal mines according to any one of claims 1 to 7, characterized in that: The preparation method comprises the following steps: adding a surfactant into water and mechanically stirring the water to obtain a mixture; The remaining components are added to the mixture and ultrasonically stirred to obtain the composite dust suppressant for coal mines.

9. The method for preparing a composite dust suppressant for coal mines according to claim 8, characterized in that: The working condition parameters of the mechanical stirring include: a stirring speed of 500-800 rpm, and a stirring time of 5-10 minutes; the working condition parameters of the ultrasonic stirring include: an ultrasonic power of 800-900 W, a stirring speed of 400-600 rpm, and a stirring time of 5-10 minutes.

Images