Water-retaining, strong-moistening and coagulation-increasing green dust suppressant for dust production link of coal mine operation

Abstract

The invention discloses a water-retaining, strong-moistening and coagulation-increasing green dust suppressant for a coal mine operation dust production link, which comprises the following components in parts by weight: 5-7 parts of inulin; 2 to 3 parts of potassium periodate; 3 to 4 parts of polyethyleneimine; 3-4 parts of a humectant; 3-4 parts of a water-retaining agent; and the balance of distilled water. The water-retaining, moisture-strengthening and coagulation-increasing green dust suppressant for the coal mine operation dust production link prepared by the invention has excellent dust suppression property, water-retaining property and wettability, and can form a solidified layer on the surface of a coal pile after being sprayed in combination with good film-forming property of the dust suppressant, so that secondary flying of coal dust is prevented.

Description

Technical Field

[0001] The invention relates to the technical field of spray dust suppression, and in particular to a water-retaining, moistening and coagulating green dust suppressant for the dust-generating link of coal mine operations. Background Art

[0002] As one of the main energy sources in my country, coal resources are of great significance to the development of the national economy. However, a large amount of coal dust is generated during coal mining, and the instantaneous dust concentration even exceeds 3000mg / m3, which not only seriously threatens the health of workers, but also affects the safety of underground operations. Therefore, it is particularly important to study underground dust reduction technology. At present, the commonly used dust reduction technologies in mines include mine ventilation, coal seam water injection, wet drilling, foam gel, spray dust reduction, etc. Among them, dust suppressant spray has been widely used in various links such as coal mining, tunneling, transshipment, transportation, and stacking in mines due to its simple operation and good dust suppression effect.

[0003] Since the physical properties of coal dust tend to be hydrophobic, most coal dust has a contact angle of more than 45° and poor wettability. Coal dust is often difficult to be directly wetted by water in the air, which makes traditional dust reduction methods, such as simple water spraying, limited in effect. Therefore, the use of chemical dust suppressants to improve the wetting effect has become an effective strategy. However, in terms of water retention, the existing technology is difficult to maintain humidity for a long time, and the coal dust problem still exists after the water evaporates, or the surface cracks due to water loss cause the coal dust suppression effect to decrease, thereby affecting the working environment and work safety. In addition, the development of green, environmentally friendly, and high-strength dust suppressant materials is currently a hot issue in coal mine dust prevention and control. Existing chemical dust suppression materials are often difficult to effectively promote due to insufficient strength and easy to cause secondary pollution. Therefore, it is urgent to develop an environmentally friendly dust suppressant with good dust suppression, wetting, water retention, and coagulation performance to solve this problem. Summary of the invention

[0004] In order to solve the technical problems existing in the above-mentioned prior art, the present invention provides a water-retaining, moisturizing and coagulating green dust suppressant for the dust-generating link in coal mine operations.

[0005] To achieve the above object, the present invention provides the following technical solution: a water-retaining, moistening and coagulating green dust suppressant for the dust-generating link of coal mine operation, comprising the following components by weight:

[0006] Inulin 5-7 parts;

[0007] 2-3 parts potassium periodate;

[0008] 3-4 parts of polyethyleneimine;

[0009] 3-4 parts of moisturizer;

[0010] 3-4 parts of water retaining agent;

[0011] The rest is distilled water.

[0012] Preferably, the wetting agent is sodium dodecylbenzene sulfonate and sodium lignin sulfonate.

[0013] Preferably, the water retaining agent is glycerol.

[0014] Preferably, by weight,

[0015] Inulin 5-7 parts;

[0016] 2-3 parts potassium periodate;

[0017] 3-4 parts of polyethyleneimine;

[0018] 3-4 parts of sodium dodecylbenzene sulfonate;

[0019] 3-4 parts of sodium lignin sulfonate;

[0020] 3-4 parts of glycerin;

[0021] The rest is distilled water.

[0022] Preferably, by weight,

[0023] Inulin 6 parts;

[0024] 2 parts potassium periodate;

[0025] 4 parts of polyethyleneimine;

[0026] 4 parts of sodium dodecylbenzene sulfonate;

[0027] 4 parts of sodium lignin sulfonate;

[0028] 4 parts of glycerol;

[0029] The rest is distilled water.

[0030] The present invention also provides a method for preparing the dust suppressant as mentioned above, comprising the following steps:

[0031] S1: preparing an inulin aqueous solution;

[0032] S2: modifying the inulin aqueous solution with potassium periodate to obtain modified solution I;

[0033] S3: preparing a polyethyleneimine aqueous solution;

[0034] S4: mixing the modified solution I with the polyethyleneimine aqueous solution, and mixing them evenly to obtain a modified solution II;

[0035] S5: adding glacial acetic acid and sodium hydroxide to adjust the pH value of modified solution II to neutral;

[0036] S6: Add sodium dodecylbenzene sulfonate, sodium lignin sulfonate and glycerol to the modified solution II, stir at room temperature until dissolved, and finally obtain the finished product.

[0037] Preferably, in S1, a certain amount of inulin is dissolved in distilled water, placed in a magnetic stirring water bath, the water bath temperature is set to 70° C., and stirred in the water bath until dissolved to obtain an inulin aqueous solution.

[0038] Preferably, in S2, after the water bath temperature is lowered to 40°C, a certain amount of potassium periodate is added to the inulin aqueous solution and the reaction is continued with stirring for 1 hour to obtain a modified solution I.

[0039] Preferably, in S3, a certain amount of polyethyleneimine is dissolved in distilled water, placed in a magnetic stirring water bath, the water bath temperature is set to 30° C., and stirred for 1 hour until dissolved to obtain a polyethyleneimine aqueous solution.

[0040] Preferably, in S4, the water bath temperature is raised to 80°C, the modified solution I is mixed with the polyethyleneimine aqueous solution, and placed in a magnetic stirring water bath, the temperature is set to 80°C, and stirred at a constant speed for 3 hours to obtain the modified solution II.

[0041] In the process of preparing the water-retaining, moistening and coagulating green dust suppressant for the dust-producing link of coal mine operations, the selected raw materials have the following characteristics:

[0042] Inulin is a natural water-soluble dietary fiber with multiple properties such as adhesion, film-forming, water-soluble, and environmentally friendly. Inulin is composed of fructose units, and its unique chemical structure allows it to form a viscous colloidal solution in water. When inulin is dissolved in water, the molecules interact through hydrogen bonds and van der Waals forces, resulting in a higher viscosity in the liquid, which can effectively adhere to dust particles in the air. At the same time, combined with its own hygroscopic properties, it can continuously moisten the dust and prevent the occurrence of secondary dust.

[0043] Sodium periodate is a white crystalline or crystalline powder soluble in water, mainly used in chemical synthesis and oxidation reactions, and can act on a variety of substrates through different mechanisms under acidic or neutral conditions. For example, hydroxyl groups (–OH) are oxidized to aldehyde groups (–CHO) or ketone groups (–C=O).

[0044] Polyethyleneimine is a water-soluble high molecular polymer with a large number of amino groups, which makes it a good modification basis. At the same time, it has certain hygroscopic properties and can effectively improve the anti-evaporation performance of aqueous solutions. Currently, polyethyleneimine is widely used in water treatment industry, polymer materials, textiles, thickeners and other fields.

[0045] Sodium dodecylbenzene sulfonate is a commonly used anionic surfactant with multiple properties such as cleaning, emulsification, dispersing, and wetting. It can significantly reduce the surface tension of water, enhance the wetting ability of water, help water molecules better penetrate and wet dust, and effectively control dust.

[0046] Sodium lignin sulfonate is a natural polymer compound, mainly derived from the sulfation process of wood lignin. Sodium lignin sulfonate has good dispersibility and wetting ability, its source is wide, and it has good economic and environmental protection.

[0047] Glycerin is a colorless, viscous, sweet triol widely used in food, medicine, cosmetics and other fields. Due to its good hydrophilicity, glycerin can form hydrogen bonds with water molecules and promote the uniform dispersion of other ingredients. In addition, glycerin's biocompatibility and low toxicity make it an ideal ingredient in many water-based formulations. By adjusting the glycerin content in the formula, the water retention and stability of the product can be improved.

[0048] The reaction equations of inulin and sodium periodate, inulin oxide and polyethyleneimine in the present invention are as follows:

[0049]

[0050] Reaction equations (1) and (2) are the basic processes of the oxidation reaction between the pyranose residues and β-D-fructofuranose on the inulin molecule and sodium periodate. The strong oxidizing property of sodium periodate causes the hydroxyl groups on the inulin molecule to be oxidized, and the aldehyde groups are introduced into the inulin molecular chain, thereby improving the reactivity of the inulin molecule. Reaction equation (3) is the cross-linking reaction between the aldehyde groups on the oxidized inulin and the amino groups on the polyethyleneimine. The Schiff base generated by the reaction acts as a bridge, which can connect the polyethyleneimine and inulin to form a stable three-dimensional network structure, thereby improving the film-forming stability.

[0051] Compared with the prior art, the present invention provides a water-retaining, moistening and coagulating green dust suppressant for the dust-generating link of coal mine operations, which has the following beneficial effects:

[0052] (1) Inulin molecules are mainly composed of pyranose residues and β-D-fructofuranosyl, both of which contain a large number of hydroxyl groups in their molecular structures. Therefore, inulin is easily soluble in water. Hydroxyl groups are very easy to form hydrogen bonds with each other, making its aqueous solution have a high viscosity. However, too high viscosity will lead to poor spray atomization effect and affect the spray effect. Therefore, the oxidant sodium periodate is added to oxidize some of the hydroxyl groups on the inulin molecules, thereby reducing the solution viscosity and improving the dust suppression efficiency.

[0053] (2) Due to the oxidation of sodium periodate, aldehyde groups are introduced into the inulin molecules, and the aldehyde groups on the oxidized inulin are cross-linked with the amine groups on the polyethyleneimine to form a Schiff base structure. The formation of the Schiff base structure can effectively enhance the stability and durability of the dust suppressant, thereby increasing its dust suppression time and reducing the dust suppression cost.

[0054] (3) The introduction of wetting agents sodium dodecylbenzene sulfonate and sodium lignin sulfonate can combine with the hydrophobic sites of coal dust, thereby improving the wetting properties of the dust suppressant itself, and making the coal dust easier to be wetted, condensed and settled. At the same time, due to the introduction of sulfonic acid groups, the hygroscopic properties of the dust suppressant are improved, and the water retention properties of the dust suppressant are improved, thereby extending the effective dust suppression life of the dust suppressant.

[0055] (4) The raw materials selected in the present invention are easily available, green and environmentally friendly, the preparation process is simple, the cost is low, and it is easier to industrialize. The prepared water-retaining, strong moistening, and coagulating green dust suppressant has good dust suppression, wettability, and water retention, and can effectively adsorb coal dust in the air. Combined with its own good water retention performance, it can attract surrounding water molecules and lock them on the surface to form a moisturizing film to prevent the surface from drying, maintain a certain degree of moisture to continuously suppress dust, and prevent dust from being raised again. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0057] Figure 1 It is the overall process flow chart of the present invention;

[0058] Figure 2 It is a comparison diagram of the contact angle test results of the liquid on the surface of the coal sample in each embodiment of the present invention and the comparative example;

[0059] Figure 3 It is a comparison chart of dust suppression test of liquids in various embodiments of the present invention and comparative examples. DETAILED DESCRIPTION

[0060] The technical solutions 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 only a part of the embodiments of the present invention, rather than all the embodiments. The components of the embodiments of the present invention generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present invention.

[0061] Example 1

[0062] This embodiment discloses a water-retaining, strong-wetting, and coagulating green dust suppressant for the dust-generating link of coal mine operations. The raw materials used include inulin, potassium periodate, polyethyleneimine, a wetting agent, and a water-retaining agent. The specific preparation method is as follows:

[0063] (1) Add 100 mL of distilled water to a beaker, dissolve 0.4 g of inulin in the water, place in a magnetic stirring water bath, set the water bath temperature to 70° C., and stir in the water bath until dissolved to obtain an inulin aqueous solution;

[0064] (2) After the water bath temperature was lowered to 40°C, 0.2 g of potassium periodate was added to the inulin aqueous solution and the reaction was continued with stirring for 1 h to obtain a modified solution I;

[0065] (3) Add 100 mL of distilled water to a beaker, and dissolve 0.4 g of polyethyleneimine in the water, place in a magnetic stirring water bath, set the water bath temperature to 30° C., and stir for 1 h until dissolved to obtain a polyethyleneimine aqueous solution;

[0066] (4) raising the water bath temperature to 80°C, mixing the modified solution I with the polyethyleneimine aqueous solution, placing the mixture in a magnetic stirring water bath, setting the temperature to 80°C, and stirring at a constant speed for 3 h to obtain the modified solution II;

[0067] (5) Lower the water bath temperature to 30°C and adjust the pH value of modified solution II to neutral by adding glacial acetic acid and sodium hydroxide;

[0068] (6) Add 0.4 g of sodium dodecylbenzene sulfonate and sodium lignin sulfonate, and 0.4 g of glycerol to the modified solution II, and stir at room temperature until dissolved, thereby finally obtaining a water-retaining, moistening, and coagulating green dust suppressant for the dust-generating link of coal mine operations.

[0069] Example 2

[0070] This embodiment adopts the same inventive concept as the first embodiment. The difference between this embodiment and the first embodiment is that the amounts of components added in the preparation processes of the two embodiments are different. The specific steps of this embodiment are as follows:

[0071] (1) Add 100 mL of distilled water to a beaker, dissolve 0.4 g of inulin in the water, place in a magnetic stirring water bath, set the water bath temperature to 70° C., and stir in the water bath until dissolved to obtain an inulin aqueous solution;

[0072] (2) After the water bath temperature was lowered to 40°C, 0.4 g of potassium periodate was added to the inulin aqueous solution and the reaction was continued with stirring for 1 h to obtain a modified solution I;

[0073] (3) Add 100 mL of distilled water to a beaker, and dissolve 0.6 g of polyethyleneimine in the water, place in a magnetic stirring water bath, set the water bath temperature to 30° C., and stir for 1 h until dissolved to obtain a polyethyleneimine aqueous solution;

[0074] (4) raising the water bath temperature to 80°C, mixing the modified solution I with the polyethyleneimine aqueous solution, placing the mixture in a magnetic stirring water bath, setting the temperature to 80°C, and stirring at a constant speed for 3 h to obtain the modified solution II;

[0075] (5) Lower the water bath temperature to 30°C and adjust the pH value of modified solution II to neutral by adding glacial acetic acid and sodium hydroxide;

[0076] (6) 0.6 g of sodium dodecylbenzene sulfonate and sodium lignin sulfonate, and 0.4 g of glycerol were added to the modified solution II, and stirred at room temperature until dissolved, thereby finally obtaining a water-retaining, moistening, and coagulating green dust suppressant for the dust-generating link of coal mine operations.

[0077] Example 3

[0078] This embodiment adopts the same inventive concept as the first embodiment. The difference between this embodiment and the first embodiment is that the amounts of components added in the preparation processes of the two embodiments are different. The specific steps of this embodiment are as follows:

[0079] (1) Add 100 mL of distilled water to a beaker, dissolve 0.4 g of inulin in the water, place in a magnetic stirring water bath, set the water bath temperature to 70° C., and stir in the water bath until dissolved to obtain an inulin aqueous solution;

[0080] (2) After the water bath temperature was lowered to 40°C, 0.6 g of potassium periodate was added to the inulin aqueous solution and the reaction was continued with stirring for 1 h to obtain a modified solution I;

[0081] (3) Add 100 mL of distilled water to a beaker, and dissolve 0.8 g of polyethyleneimine in the water, place in a magnetic stirring water bath, set the water bath temperature to 30° C., and stir for 1 h until dissolved to obtain a polyethyleneimine aqueous solution;

[0082] (4) raising the water bath temperature to 80°C, mixing the modified solution I with the polyethyleneimine aqueous solution, placing the mixture in a magnetic stirring water bath, setting the temperature to 80°C, and stirring at a constant speed for 3 h to obtain the modified solution II;

[0083] (5) Lower the water bath temperature to 30°C and adjust the pH value of modified solution II to neutral by adding glacial acetic acid and sodium hydroxide;

[0084] (6) Add 0.8 g of sodium dodecylbenzene sulfonate and sodium lignin sulfonate, and 0.4 g of glycerol to the modified solution II, and stir at room temperature until dissolved, and finally obtain a water-retaining, moistening, and coagulating green dust suppressant for the dust-generating link of coal mine operations.

[0085] Example 4

[0086] This embodiment adopts the same inventive concept as the first embodiment. The difference between this embodiment and the first embodiment is that the amounts of components added in the preparation processes of the two embodiments are different. The specific steps of this embodiment are as follows:

[0087] (1) Add 100 mL of distilled water to a beaker, dissolve 0.6 g of inulin in the water, place in a magnetic stirring water bath, set the water bath temperature to 70° C., and stir in the water bath until dissolved to obtain an inulin aqueous solution;

[0088] (2) After the water bath temperature was lowered to 40°C, 0.2 g of potassium periodate was added to the inulin aqueous solution and the reaction was continued with stirring for 1 h to obtain a modified solution I;

[0089] (3) Add 100 mL of distilled water to a beaker, and dissolve 0.6 g of polyethyleneimine in the water, place in a magnetic stirring water bath, set the water bath temperature to 30° C., and stir for 1 h until dissolved to obtain a polyethyleneimine aqueous solution;

[0090] (4) raising the water bath temperature to 80°C, mixing the modified solution I with the polyethyleneimine aqueous solution, placing the mixture in a magnetic stirring water bath, setting the temperature to 80°C, and stirring at a constant speed for 3 h to obtain the modified solution II;

[0091] (5) Lower the water bath temperature to 30°C and adjust the pH value of modified solution II to neutral by adding glacial acetic acid and sodium hydroxide;

[0092] (6) Add 0.8 g of sodium dodecylbenzene sulfonate and sodium lignin sulfonate, and 0.4 g of glycerol to the modified solution II, and stir at room temperature until dissolved, and finally obtain a water-retaining, moistening, and coagulating green dust suppressant for the dust-generating link of coal mine operations.

[0093] Example 5

[0094] This embodiment adopts the same inventive concept as the first embodiment. The difference between this embodiment and the first embodiment is that the amounts of components added in the preparation processes of the two embodiments are different. The specific steps of this embodiment are as follows:

[0095] (1) Add 100 mL of distilled water to a beaker, dissolve 0.6 g of inulin in the water, place in a magnetic stirring water bath, set the water bath temperature to 70° C., and stir in the water bath until dissolved to obtain an inulin aqueous solution;

[0096] (2) After the water bath temperature was lowered to 40°C, 0.4 g of potassium periodate was added to the inulin aqueous solution and the reaction was continued with stirring for 1 h to obtain a modified solution I;

[0097] (3) Add 100 mL of distilled water to a beaker, and dissolve 0.8 g of polyethyleneimine in the water, place in a magnetic stirring water bath, set the water bath temperature to 30° C., and stir for 1 h until dissolved to obtain a polyethyleneimine aqueous solution;

[0098] (4) raising the water bath temperature to 80°C, mixing the modified solution I with the polyethyleneimine aqueous solution, placing the mixture in a magnetic stirring water bath, setting the temperature to 80°C, and stirring at a constant speed for 3 h to obtain the modified solution II;

[0099] (5) Lower the water bath temperature to 30°C and adjust the pH value of modified solution II to neutral by adding glacial acetic acid and sodium hydroxide;

[0100] (6) Add 0.4 g of sodium dodecylbenzene sulfonate and sodium lignin sulfonate, and 0.4 g of glycerol to the modified solution II, and stir at room temperature until dissolved, and finally obtain a water-retaining, moistening, and coagulating green dust suppressant for the dust-generating link of coal mine operations.

[0101] Example 6

[0102] This embodiment adopts the same inventive concept as the first embodiment. The difference between this embodiment and the first embodiment is that the amounts of components added in the preparation processes of the two embodiments are different. The specific steps of this embodiment are as follows:

[0103] (1) Add 100 mL of distilled water to a beaker, dissolve 0.6 g of inulin in the water, place in a magnetic stirring water bath, set the water bath temperature to 70° C., and stir in the water bath until dissolved to obtain an inulin aqueous solution;

[0104] (2) After the water bath temperature was lowered to 40°C, 0.6 g of potassium periodate was added to the inulin aqueous solution and the reaction was continued with stirring for 1 h to obtain a modified solution I;

[0105] (3) Add 100 mL of distilled water to a beaker, and dissolve 0.4 g of polyethyleneimine in the water, place in a magnetic stirring water bath, set the water bath temperature to 30° C., and stir for 1 h until dissolved to obtain a polyethyleneimine aqueous solution;

[0106] (4) raising the water bath temperature to 80°C, mixing the modified solution I with the polyethyleneimine aqueous solution, placing the mixture in a magnetic stirring water bath, setting the temperature to 80°C, and stirring at a constant speed for 3 h to obtain the modified solution II;

[0107] (5) Lower the water bath temperature to 30°C and adjust the pH value of modified solution II to neutral by adding glacial acetic acid and sodium hydroxide;

[0108] (6) 0.6 g of sodium dodecylbenzene sulfonate and sodium lignin sulfonate, and 0.4 g of glycerol were added to the modified solution II, and stirred at room temperature until dissolved, thereby finally obtaining a water-retaining, moistening, and coagulating green dust suppressant for the dust-generating link of coal mine operations.

[0109] Example 7

[0110] This embodiment adopts the same inventive concept as the first embodiment. The difference between this embodiment and the first embodiment is that the amounts of components added in the preparation processes of the two embodiments are different. The specific steps of this embodiment are as follows:

[0111] (1) Add 100 mL of distilled water to a beaker, dissolve 0.8 g of inulin in the water, place in a magnetic stirring water bath, set the water bath temperature to 70° C., and stir in the water bath until dissolved to obtain an inulin aqueous solution;

[0112] (2) After the water bath temperature was lowered to 40°C, 0.2 g of potassium periodate was added to the inulin aqueous solution and the reaction was continued with stirring for 1 h to obtain a modified solution I;

[0113] (3) Add 100 mL of distilled water to a beaker, and dissolve 0.8 g of polyethyleneimine in the water, place in a magnetic stirring water bath, set the water bath temperature to 30° C., and stir for 1 h until dissolved to obtain a polyethyleneimine aqueous solution;

[0114] (4) raising the water bath temperature to 80°C, mixing the modified solution I with the polyethyleneimine aqueous solution, placing the mixture in a magnetic stirring water bath, setting the temperature to 80°C, and stirring at a constant speed for 3 h to obtain the modified solution II;

[0115] (5) Lower the water bath temperature to 30°C and adjust the pH value of modified solution II to neutral by adding glacial acetic acid and sodium hydroxide;

[0116] (6) 0.6 g of sodium dodecylbenzene sulfonate and sodium lignin sulfonate, and 0.4 g of glycerol were added to the modified solution II, and stirred at room temperature until dissolved, thereby finally obtaining a water-retaining, moistening, and coagulating green dust suppressant for the dust-generating link of coal mine operations.

[0117] Example 8

[0118] This embodiment adopts the same inventive concept as the first embodiment. The difference between this embodiment and the first embodiment is that the amounts of components added in the preparation processes of the two embodiments are different. The specific steps of this embodiment are as follows:

[0119] (1) Add 100 mL of distilled water to a beaker, dissolve 0.8 g of inulin in the water, place in a magnetic stirring water bath, set the water bath temperature to 70° C., and stir in the water bath until dissolved to obtain an inulin aqueous solution;

[0120] (2) After the water bath temperature was lowered to 40°C, 0.4 g of potassium periodate was added to the inulin aqueous solution and the reaction was continued with stirring for 1 h to obtain a modified solution I;

[0121] (3) Add 100 mL of distilled water to a beaker, and dissolve 0.4 g of polyethyleneimine in the water, place in a magnetic stirring water bath, set the water bath temperature to 30° C., and stir for 1 h until dissolved to obtain a polyethyleneimine aqueous solution;

[0122] (4) raising the water bath temperature to 80°C, mixing the modified solution I with the polyethyleneimine aqueous solution, placing the mixture in a magnetic stirring water bath, setting the temperature to 80°C, and stirring at a constant speed for 3 h to obtain the modified solution II;

[0123] (5) Lower the water bath temperature to 30°C and adjust the pH value of modified solution II to neutral by adding glacial acetic acid and sodium hydroxide;

[0124] (6) Add 0.8 g of sodium dodecylbenzene sulfonate and sodium lignin sulfonate, and 0.4 g of glycerol to the modified solution II, and stir at room temperature until dissolved, and finally obtain a water-retaining, moistening, and coagulating green dust suppressant for the dust-generating link of coal mine operations.

[0125] Example 9

[0126] This embodiment adopts the same inventive concept as the first embodiment. The difference between this embodiment and the first embodiment is that the amounts of components added in the preparation processes of the two embodiments are different. The specific steps of this embodiment are as follows:

[0127] (1) Add 100 mL of distilled water to a beaker, dissolve 0.8 g of inulin in the water, place in a magnetic stirring water bath, set the water bath temperature to 70° C., and stir in the water bath until dissolved to obtain an inulin aqueous solution;

[0128] (2) After the water bath temperature was lowered to 40°C, 0.6 g of potassium periodate was added to the inulin aqueous solution and the reaction was continued with stirring for 1 h to obtain a modified solution I;

[0129] (3) Add 100 mL of distilled water to a beaker, and dissolve 0.6 g of polyethyleneimine in the water, place in a magnetic stirring water bath, set the water bath temperature to 30° C., and stir for 1 h until dissolved to obtain a polyethyleneimine aqueous solution;

[0130] (4) raising the water bath temperature to 80°C, mixing the modified solution I with the polyethyleneimine aqueous solution, placing the mixture in a magnetic stirring water bath, setting the temperature to 80°C, and stirring at a constant speed for 3 h to obtain the modified solution II;

[0131] (5) Lower the water bath temperature to 30°C and adjust the pH value of modified solution II to neutral by adding glacial acetic acid and sodium hydroxide;

[0132] (6) Add 0.4 g of sodium dodecylbenzene sulfonate and sodium lignin sulfonate, and 0.4 g of glycerol to the modified solution II, and stir at room temperature until dissolved, and finally obtain a water-retaining, moistening, and coagulating green dust suppressant for the dust-generating link of coal mine operations.

[0133] Comparative Example 1

[0134] 0.6 g of inulin and 0.6 g of sodium dodecylbenzene sulfonate were dissolved in 200 mL of distilled water to obtain a solution corresponding to Comparative Example 1.

[0135] Comparative Example 2

[0136] Pure distilled water was used as the corresponding solution of Comparative Example 2.

[0137] The water-retaining, wettability and dust-suppressing properties of the water-retaining, wettability and coagulation-enhancing green dust suppressants prepared in Examples 1-9 and Comparative Examples 1-2 were tested.

[0138] The water retention test method is: spray 20g of different types of corresponding solutions on the same mass of coal samples, and weigh the initial mass of the samples, place all samples in a 70℃ constant temperature drying oven for drying, record the sample mass every 1h, the total drying time is 8h, and subtract the mass of the sample before and after drying to get the corresponding water loss (g). The water loss data is shown in the following table:

[0139] Table 1 Water retention test

[0140]

[0141] As can be seen from the above table, the water in each solution starts to evaporate in 0-3h, and the weight of each sample starts to decrease accordingly, but due to the high water content, the difference in water consumption between the embodiment and the comparative example is not obvious; 4-8h is the rapid water loss stage, taking embodiment 9 and comparative example 1 as examples, the water loss in 4-8h is 7.64g and 9.01g respectively, from which it can be seen that the coal sample sprayed with the dust suppressant configured by the present invention has better water retention performance after drying than the coal sample sprayed with the comparative example reagent. Due to the good dust suppression and water retention, it can effectively lock the water in the actual dust suppression work, so that the coal dust can be kept moist and prevented from being raised again.

[0142] The wettability test method is: using a contact angle measuring instrument to measure the contact angle of the corresponding solution liquid on the surface of the coal sample to evaluate the wettability of the droplet on the coal. The coal sample is a coal cake compressed from 0.5g of 200-mesh coal powder.

[0143] Pure water is difficult to wet dust. Figure 2 It can be seen that the contact angles of the embodiments are all less than or equal to 28°, while the contact angles of Comparative Examples 1-2 are 38° and 76°, indicating that the wetting ability of the embodiments on the coal samples is stronger than that of Comparative Examples 1-2. The stronger wetting effect can improve the wetting efficiency of the coal dust, thereby making the coal dust more easily wetted by water and improving the dust suppression efficiency.

[0144] The dust suppression test method is as follows: spray the dust suppression solutions of the embodiment and the comparative example on coal samples with the same initial mass, dry them at 50°C for 24 hours in a constant temperature drying oven, simulate wind erosion of the coal samples, and use a wind speed of 12 m / s to erode the coal samples for 5 minutes (the wind source is 1 m away from the sample). After wind erosion, the mass of the coal samples after wind erosion is recorded, and the dust suppression efficiency is obtained by subtracting the wind erosion mass from the initial mass and dividing the result by the initial mass.

[0145] Depend on Figure 3 It can be seen that the water-retaining, strong wetting and coagulating green dust suppressant for the dust-producing link of coal mine operations prepared by the present invention has a good anti-wind erosion effect in dust suppression, and its dust suppression efficiency is higher than 97%, which is much higher than 64% and 42% of the control example. Therefore, it can be considered that the water-retaining, strong wetting and coagulating green dust suppressant for the dust-producing link of coal mine operations prepared by the present invention basically meets the expected effect.

[0146] In summary, the water-retaining, moistening and coagulating green dust suppressant prepared by the present invention for the dust-producing link of coal mine operations has excellent dust suppression, water retention and wettability, combined with its own good film-forming properties. After spraying, it can form a solidified layer on the surface of the coal pile, thereby preventing the secondary flying of coal dust.

[0147] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0148] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A water-retaining, moistening and coagulating green dust suppressant for the dust-generating link of coal mine operation, characterized in that: By weight, it includes the following components: Inulin 5-7 parts; 2-3 parts potassium periodate; 3-4 parts of polyethyleneimine; 3-4 parts of moisturizer; 3-4 parts of water retaining agent; The rest is distilled water.

2. A water-retaining, moistening and coagulating green dust suppressant for the dust-generating link of coal mine operations according to claim 1, characterized in that: The wetting agents are sodium dodecylbenzene sulfonate and sodium lignin sulfonate.

3. A water-retaining, moistening and coagulating green dust suppressant for the dust-generating link of coal mine operations according to claim 2, characterized in that: The water retaining agent is glycerin.

4. A water-retaining, moistening and coagulating green dust suppressant for the dust-generating link of coal mine operation according to claim 3, characterized in that: By weight, Inulin 5-7 parts; 2-3 parts potassium periodate; 3-4 parts of polyethyleneimine; 3-4 parts of sodium dodecylbenzene sulfonate; 3-4 parts of sodium lignin sulfonate; 3-4 parts of glycerin; The rest is distilled water.

5. A water-retaining, moistening and coagulating green dust suppressant for the dust-generating link of coal mine operation according to claim 4, characterized in that: By weight, Inulin 6 parts; 2 parts potassium periodate; 4 parts of polyethyleneimine; 4 parts of sodium dodecylbenzene sulfonate; 4 parts of sodium lignin sulfonate; 4 parts of glycerol; The rest is distilled water.

6. A method for preparing a water-retaining, moistening and coagulating green dust suppressant for dust generation in coal mine operations as described in any one of claims 1 to 5, characterized in that: The following steps are involved: S1: preparing an inulin aqueous solution; S2: modifying the inulin aqueous solution with potassium periodate to obtain modified solution I; S3: preparing a polyethyleneimine aqueous solution; S4: mixing the modified solution I with the polyethyleneimine aqueous solution, and mixing them evenly to obtain a modified solution II; S5: adding glacial acetic acid and sodium hydroxide to adjust the pH value of modified solution II to neutral; S6: Add sodium dodecylbenzene sulfonate, sodium lignin sulfonate and glycerol to the modified solution II, stir at room temperature until dissolved, and finally obtain the finished product.

7. A water-retaining, moistening and coagulating green dust suppressant for the dust-generating link of coal mine operation according to claim 6, characterized in that: In S1, a certain amount of inulin is dissolved in distilled water, and the solution is placed in a magnetic stirring water bath, the water bath temperature is set to 70° C., and the water bath is stirred until dissolved to obtain an inulin aqueous solution.

8. A water-retaining, moistening and coagulating green dust suppressant for the dust-generating link of coal mine operation according to claim 7, characterized in that: In S2, after the water bath temperature is lowered to 40°C, a certain amount of potassium periodate is added to the inulin aqueous solution and the reaction is continued with stirring for 1 hour to obtain a modified solution I.

9. A water-retaining, moistening and coagulating green dust suppressant for the dust-generating link of coal mine operation according to claim 8, characterized in that: In S3, a certain amount of polyethyleneimine is dissolved in distilled water, placed in a magnetic stirring water bath, the water bath temperature is set to 30° C., and stirred for 1 hour until dissolved to obtain a polyethyleneimine aqueous solution.

10. A water-retaining, moistening and coagulating green dust suppressant for the dust-generating link of coal mine operation according to claim 9, characterized in that: In S3, the water bath temperature is raised to 80°C, the modified solution I is mixed with the polyethyleneimine aqueous solution, and placed in a magnetic stirring water bath, the temperature is set to 80°C, and stirred at a constant speed for 3 hours to obtain the modified solution II.

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