A multiple-strengthened network dust suppressant material for suppressing coal pile dust and its preparation method

Abstract

The present invention discloses a multiple-reinforced network dust suppression material for suppressing coal pile dust and a preparation method thereof, which relates to the technical field of coal mine dust suppression. The preparation process of the multiple-reinforced network dust suppression material: Dissolve soy protein isolate in water, add arabic gum and stir, adjust the pH to obtain mixture I; Stir at a constant temperature; Heat up and stir to obtain glycosylated mixture I; Cool to room temperature in a water bath and add transglutaminase, react to obtain mixture II; After the reaction is completed, carry out heat treatment to inactivate the enzyme; After cooling, add dilute glutaraldehyde and react to obtain mixture III; Add dodecyldimethylamine oxide and glycerol and stir to prepare the multiple-reinforced network dust suppression material. The beneficial effect of the present invention is that the prepared multiple-reinforced network dust suppression material has good dust suppression and wettability, can effectively adsorb coal dust particles, and combined with its own good viscosity, can better capture fine coal dust in the air and finally settle into a film, effectively preventing the secondary flying of coal dust.

Description

Technical Field

[0001] The invention relates to the technical field of coal mine dust suppression, and in particular to a multi-reinforced network dust suppression material for suppressing dust from a coal pile and a preparation method thereof. Background Art

[0002] In recent years, coal dust pollution has gradually become the focus of social and corporate attention. In the production process of coal mining, storage, transportation, processing, etc., different levels of coal dust will be generated. Coal dust adheres to underground tunnels, coal conveyor belts and coal piles. In addition to causing serious dust explosion accidents, it will also cause a sharp increase in the concentration of respirable dust in the workplace. Among them, inhalable particulate matter PM10 (aerodynamic equivalent particle diameter less than 10μm) is the main cause of pneumoconiosis.

[0003] At present, coal mines often adopt measures such as spraying, chemical dust suppression, and controlled ventilation to suppress dust, among which the method of spraying combined with chemical dust suppression is widely used. However, due to the hydrophobicity of coal, fine dust is difficult to be fully wetted by water, and the amount of water evaporation is large, and repeated spraying is required to ensure the dust suppression effect, which not only wastes water resources, but also consumes a lot of manpower and material resources. Chemical dust suppression technology can wet and bond coal dust, has a better dust suppression effect, and avoids repeated spraying. However, in actual applications, dust suppression materials have disadvantages such as low strength, difficult degradation, and high corrosiveness, which also have a negative impact on the environment, seriously limiting the promotion and application of chemical dust suppressants.

[0004] Therefore, it is urgent to develop a dust suppressant that is both dust suppressant and environmentally friendly to solve this problem. Summary of the invention

[0005] In order to solve the above technical problems, the present invention discloses a multi-reinforced network dust suppression material for suppressing dust from coal piles and a preparation method thereof. The prepared multi-reinforced network dust suppression material has good dust suppression and wettability, and can effectively adsorb coal dust particles. Combined with its own good viscosity, it can better capture fine coal dust in the air and eventually settle into a film, effectively preventing the secondary flying of coal dust.

[0006] To achieve the above object, the present invention adopts the following technical solution: a multi-reinforced network dust suppression material for suppressing dust from coal piles, the raw materials, calculated by mass, include:

[0007]

[0008] The balance is distilled water.

[0009] Furthermore, the wetting agent is dodecyl dimethyl amine oxide; and the water retaining agent is glycerol.

[0010] Furthermore, the mass fraction of the dilute glutaraldehyde is 5%.

[0011] Furthermore, by mass ratio, the raw materials are: soy protein isolate: gum arabic: transglutaminase: dilute glutaraldehyde: dodecyldimethylamine oxide: glycerol = 10:5:4:4:20:4.

[0012] Furthermore, the mass of each raw material is:

[0013]

[0014] The present invention also discloses a preparation method of a multi-reinforced network dust suppressant material for suppressing coal pile dust, which specifically includes the following steps:

[0015] S1: Add distilled water to a beaker. Under room temperature conditions, dissolve a certain amount of soy protein isolate in water, then add gum arabic in a certain proportion and stir. Add glacial acetic acid and sodium hydroxide to adjust the pH to 7 to obtain mixture I.

[0016] S2: Place mixture I in a magnetic stirring constant temperature water bath and stir for 3 h at 30 °C to fully dissolve.

[0017] S3: Raise the temperature of the water bath to 95 °C and continue stirring for 5 h to obtain glycosylated mixture I.

[0018] S4: Cool the glycosylated mixture I to room temperature in a water bath. Add a certain proportion of transglutaminase to the glycosylated mixture I, and then place it in a water bath at 35 °C and react for 2 h to obtain mixture II.

[0019] S5: After the reaction, raise the temperature of the water bath to 95 °C for 20 min for enzyme inactivation treatment.

[0020] S6: Lower the temperature of the water bath to 80 °C, add a certain amount of 5% dilute glutaraldehyde to mixture II, and react for 30 min to obtain mixture III.

[0021] S7: Cool mixture III to room temperature, add a certain amount of dodecyldimethylamine oxide and glycerol, and magnetically stir in a magnetic stirring water bath at 30 °C for 30 min to prepare the multi-reinforced network dust suppressant material.

[0022] In the process of preparing the multi-reinforced network dust suppressant material of the present invention, the selected raw materials have the following characteristics:

[0023] Soy protein isolate is a commonly used food base material in the food industry, which has multiple functional characteristics such as water retention, foaming, gelling, and film-forming. It can form a dense protective film on the surface of coal samples to inhibit secondary dust generation, and at the same time has good economic and environmental protection properties.

[0024] Arabic gum is a natural polysaccharide with good emulsification stability and is a widely used emulsification stabilizer in industrial production. Due to its large number of hydroxyl groups, after grafting with proteins, it will improve the solubility of proteins and is an excellent choice for preparing emulsifying protein grafts.

[0025] Transglutaminase exists widely in nature. As a protein modifier, it can modify proteins through three pathways: amine introduction, cross-linking, and deamination, and has an improving effect on the spatial structure of proteins and their functional properties such as water retention, foaming property, rheological property, and thermal stability.

[0026] Glutaraldehyde is an organic compound commonly used as a bactericide, food industry processing aid, disinfectant, leather tanning agent, wood preservative, pharmaceutical, and raw material for polymer synthesis, etc. Its aldehyde groups can undergo acetal reactions with hydroxyl groups to cross-link the hydroxyl groups and improve the stability of the modified products.

[0027] Dodecyldimethylamine oxide has good surfactant wetting properties and also has excellent solubilization, thickening, emulsification, foaming, foam stabilization, moisturizing, and antistatic advantages.

[0028] Glycerol has good water retention properties. It can attract surrounding water molecules and lock them on the surface to form a moisture retention film, preventing the surface from drying and maintaining a certain degree of humidity. At the same time, glycerol can also improve the smoothness of the film surface of the dust suppressant and prevent secondary dust flying caused by cracking.

[0029] In the present invention, the reaction equations of soy protein isolate with Arabic gum, soy protein isolate with transglutaminase, and the glycosylation product with glutaraldehyde are as follows:

[0030]

[0031] Reaction equation (1) is the glycosylation reaction of soy protein isolate by Arabic gum in a high-temperature environment. Through the modification of the protein molecular structure by polysaccharides, the free amino groups are grafted with sugars, introducing the hydroxyl groups of polysaccharides into the structure of soy protein isolate, and improving the solubility and stability of proteins.

[0032] Reaction equation (2) is that the γ-carboxamido groups on soy protein isolate undergo cross-linking reactions with primary amino groups and ε-amino groups respectively under the catalysis of transglutaminase, realizing covalent cross-linking between protein molecules and generating a three-dimensional network structure composition.

[0033] Reaction equation (3) is the acetal reaction of the hydroxyl groups of the final product in the glycosylation reaction of reaction equation (1) with the aldehyde groups on glutaraldehyde, cross-linking the glycosylation products pairwise to form a more stable cross-linked network structure.

[0034] The beneficial effects of the present invention are

[0035] (1) Gum arabic performs glycosylation reaction on the free amino groups of soy protein isolate, enabling the free amino groups to graft with sugars, introducing the hydroxyl groups of polysaccharides into the structure of soy protein isolate, and initially forming a relatively ordered three-dimensional network structure framework. The glycosylation reaction improves the stability and solubility of soy protein isolate by changing the protein structure. The remaining unreacted soy protein isolate undergoes a cross-linking reaction by adding transglutaminase. Transglutaminase catalyzes the acyl transfer reaction between the γ-carbonyl group of glutamine residues and the ε-amino group of lysine residues, enabling covalent cross-linking between protein molecules to generate a gel with a three-dimensional network structure. The addition of transglutaminase generates ε-(γ-glutamyl) lysine covalent bonds between or within protein molecules, increasing the molecular weight and enhancing the gel property, and improving the elasticity, viscosity, water retention and other properties of the protein. Finally, glutaraldehyde is used to further cross-link the glycosylation product. The aldehyde group of glutaraldehyde undergoes an acetal reaction with the hydroxyl group of the glycosylation product to cross-link the glycosylation products in pairs, forming a more stable network structure and further increasing the film hardness.

[0036] (2) The modified product after the reaction is mixed with a wetting agent (dodecyldimethylamine oxide). The surfactant can reduce the surface tension of water, and its molecules can adsorb on the surface of coal dust and form an oriented adsorption layer, thereby improving the wettability of the dust suppressant to coal dust and making the coal dust easier to be wetted. Adding a water retaining agent (glycerol) can improve the anti-evaporation property of the dust suppressant, extend the dust suppression time, and at the same time improve the smoothness of the film formed by the dust suppressant, preventing the surface of the coal shell from cracking and causing secondary dust emission.

[0037] (3) Soy protein isolate has good film-forming property, economy and environmental friendliness. It has numerous free amino groups in its molecular formula and can graft with sugars. Gum arabic is a common polysaccharide, and its molecular formula contains a large number of hydroxyl groups. Its glycosylation can change the charge density on the protein surface and increase the electrostatic repulsion to improve hydrophilicity and lipophilicity. At the same time, due to the formation of a three-dimensional network structure around the adsorbed film by the covalently bound polysaccharide molecular chains, the thickness and mechanical strength of the film are increased, effectively improving the stability, solubility and other properties of the protein. Transglutaminase is a natural enzyme, environmentally friendly and excellent in economy. It can selectively catalyze the reaction of glutamyl amino acids (glutamic acid and lysine) in proteins to form covalent bonds and achieve the cross-linking of proteins. The reaction speed is fast and the cross-linking reaction of proteins can be completed in a relatively short time. Glutaraldehyde has a simple molecular structure, few side reactions and a high aldehyde group content. Selecting 5% dilute glutaraldehyde can reduce the severity of the reaction, enhance the safety of the reaction, reduce the harm to production personnel, and at the same time has certain disinfection performance to ensure the long-term storage of the dust suppressant.

[0038] The raw materials selected in the present invention are easily available, the preparation process is simple, the cost is low, and it is more suitable for industrial production. The multi-reinforced network dust suppression material prepared by the present invention has good dust suppression and wettability, can effectively adsorb coal dust particles, and combined with its own good viscosity, can better capture fine coal dust in the air and finally settle into a film, effectively preventing the secondary flying of coal dust.

[0039] In summary, the multi-reinforced network dust suppression material prepared by the present invention has various excellent properties such as dust suppression, film formation, wettability, foaming property, adhesiveness, economy, and environmental protection. Brief Description of the Drawings

[0040] Figure 1 It is a schematic process flow diagram of Embodiment 1 of the present invention. Detailed Description of the Embodiments

[0041] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of the present invention. Therefore, the detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention claimed, but merely represents selected embodiments of the present invention.

[0042] Embodiment 1

[0043] A preparation method of a multi-reinforced network dust suppression material for suppressing coal pile dust, as Figure 1 shown, specifically includes the following steps:

[0044] (1) Add 200 ml of distilled water to a beaker, add 0.6 g of soy protein isolate and 0.4 g of arabic gum, adjust the pH to 7 with glacial acetic acid and sodium hydroxide, and place it in a magnetic stirring water bath at 30 °C for magnetic stirring for 3 h to obtain a mixed solution Ⅰ after dissolution;

[0045] (2) Heat the magnetic stirring water bath to 95 °C, and magnetically stir the mixed solution Ⅰ for 5 h to obtain a glycosylated mixed solution Ⅰ;

[0046] (3) Cool the glycosylated mixed solution Ⅰ to room temperature, add 0.2 g of transglutaminase to the glycosylated mixed solution Ⅰ, and then place it in a magnetic stirring water bath at 35 °C for reaction for 2 h to obtain a mixed solution Ⅱ;

[0047] (4) Heat the magnetic stirring water bath to 95°C, inactivate the enzyme at high temperature for 20 min, then cool it to 80°C, add 0.2 g of 5% dilute glutaraldehyde, and stir magnetically for 30 min to obtain mixture III;

[0048] (5) After cooling the mixture to room temperature, add 2 g of lauryldimethylamine oxide and 0.4 g of glycerol, place it under a magnetic stirring water bath at 30°C and stir until dissolved to obtain the multi-reinforced network dust suppressant material.

[0049] Example 2

[0050] A preparation method of a multi-reinforced network dust suppressant material for suppressing coal pile dust, specifically including the following steps:

[0051] (1) Add 200 ml of distilled water to a beaker, add 0.6 g of soy protein isolate and 0.6 g of arabic gum, adjust the pH to 7 with glacial acetic acid and sodium hydroxide, place it in a magnetic stirring water bath at 30°C and stir magnetically for 3 h to obtain mixture I;

[0052] (2) Heat the magnetic stirring water bath to 95°C, and stir mixture I magnetically for 5 h to obtain glycosylated mixture I;

[0053] (3) Cool the glycosylated mixture I to room temperature, add 0.4 g of transglutaminase to the glycosylated mixture I, and then place it in a magnetic stirring water bath at 35°C and react for 2 h to obtain mixture II;

[0054] (4) Heat the magnetic stirring water bath to 95°C, inactivate the enzyme at high temperature for 20 min, then cool it to 80°C, add 0.4 g of 5% dilute glutaraldehyde, and stir magnetically for 30 min to obtain mixture III;

[0055] (5) After cooling the mixture to room temperature, add 1.6 g of lauryldimethylamine oxide and 0.4 g of glycerol, place it under a magnetic stirring water bath at 30°C and stir until dissolved to obtain the multi-reinforced network dust suppressant material.

[0056] Example 3

[0057] A preparation method of a multi-reinforced network dust suppressant material for suppressing coal pile dust, specifically including the following steps:

[0058] (1) Add 200 ml of distilled water to a beaker, add 0.6 g of soy protein isolate and 0.8 g of arabic gum, adjust the pH to 7 with glacial acetic acid and sodium hydroxide, place it in a magnetic stirring water bath at 30°C and stir magnetically for 3 h to obtain mixture I;

[0059] (2) Heat the magnetic stirring water bath to 95°C, and stir mixture I magnetically for 5 h to obtain glycosylated mixture I;

[0060] (3) Cool the glycosylation mixture Ⅰ to room temperature, add 0.6 g of transglutaminase to the glycosylation mixture Ⅰ, and then place it in a magnetic stirring water bath at 35 °C for reaction for 2 h to obtain mixture Ⅱ;

[0061] (4) Raise the temperature of the magnetic stirring water bath to 95 °C, inactivate the enzyme at high temperature for 20 min, then cool down to 80 °C, add 0.6 g of 5% dilute glutaraldehyde, and stir magnetically for 30 min to obtain mixture Ⅲ;

[0062] (5) After cooling the mixture to room temperature, add 1.4 g of lauryldimethylamine oxide and 0.6 g of glycerol, and place it under magnetic stirring in a water bath at 30 °C and stir until dissolved to obtain the multi-reinforced network dust suppressant material.

[0063] Example 4

[0064] A preparation method of a multi-reinforced network dust suppressant material for suppressing coal pile dust, specifically including the following steps:

[0065] (1) Add 200 ml of distilled water to a beaker, add 1 g of soy protein isolate and 0.6 g of arabic gum, adjust the pH to 7 with glacial acetic acid and sodium hydroxide, and place it in a magnetic stirring water bath at 30 °C and stir magnetically for 3 h to obtain mixture Ⅰ after dissolution;

[0066] (2) Raise the temperature of the magnetic stirring water bath to 95 °C, and stir the mixture Ⅰ magnetically for 5 h to obtain the glycosylation mixture Ⅰ;

[0067] (3) Cool the glycosylation mixture Ⅰ to room temperature, add 0.4 g of transglutaminase to the glycosylation mixture Ⅰ, and then place it in a magnetic stirring water bath at 35 °C for reaction for 2 h to obtain mixture Ⅱ;

[0068] (4) Raise the temperature of the magnetic stirring water bath to 95 °C, inactivate the enzyme at high temperature for 20 min, then cool down to 80 °C, add 0.6 g of 5% dilute glutaraldehyde, and stir magnetically for 30 min to obtain mixture Ⅲ;

[0069] (5) After cooling the mixture to room temperature, add 1 g of lauryldimethylamine oxide and 0.4 g of glycerol, and place it under magnetic stirring in a water bath at 30 °C and stir until dissolved to obtain the multi-reinforced network dust suppressant material.

[0070] Example 5

[0071] A preparation method of a multi-reinforced network dust suppressant material for suppressing coal pile dust, specifically including the following steps:

[0072] (1) Add 200 ml of distilled water to a beaker, and add 1 g of soy protein isolate and 1 g of gum arabic. Adjust the pH to 7 with glacial acetic acid and sodium hydroxide, and place it in a magnetic stirring water bath at 30 °C for magnetic stirring for 3 h to obtain a mixed solution Ⅰ after dissolution;

[0073] (2) Heat the magnetic stirring water bath to 95 °C, and magnetically stir the mixed solution Ⅰ for 5 h to obtain a glycosylated mixed solution Ⅰ;

[0074] (3) Cool the glycosylated mixed solution Ⅰ to room temperature, add 0.6 g of transglutaminase to the glycosylated mixed solution Ⅰ, and then place it in a magnetic stirring water bath at 35 °C for reaction for 2 h to obtain a mixed solution Ⅱ;

[0075] (4) Heat the magnetic stirring water bath to 95 °C, inactivate the enzyme at high temperature for 20 min, then cool down to 80 °C, add 0.2 g of 5% dilute glutaraldehyde, and magnetically stir for 30 min to obtain a mixed solution Ⅲ;

[0076] (5) After cooling the mixed solution to room temperature, add 2 g of dodecyldimethylamine oxide and 0.6 g of glycerol, and place it under magnetic stirring in a water bath at 30 °C and stir until dissolved to obtain a multi-reinforced network dust suppressant material.

[0077] Comparative Example 1

[0078] (1) Add 200 ml of distilled water to a beaker, and add 1 g of soy protein isolate. Adjust the pH to 7 with glacial acetic acid and sodium hydroxide, and place it in a magnetic stirring water bath at 30 °C for magnetic stirring for 3 h to obtain a mixed solution Ⅰ after dissolution;

[0079] (2) Add 1 g of dodecyldimethylamine oxide and 0.4 g of glycerol to the mixed solution Ⅰ, and place it under magnetic stirring in a water bath at 25 °C and stir until dissolved.

[0080] Comparative Example 2

[0081] Add 200 ml of distilled water to a beaker and add 2 g of dodecyldimethylamine oxide and 0.4 g of glycerol, and place it under magnetic stirring in a water bath at 25 °C and stir until dissolved.

[0082] Next, the water retention, dust suppression performance, and crust hardness of the multi-reinforced network dust suppressant materials prepared in Examples 1-5, and the solutions obtained in Comparative Example 1 and Comparative Example 2 were tested.

[0083] 1. Water retention test

[0084] Specific process: Use a vacuum drying oven to test its water retention rate to explore the water retention of each material on coal dust.

[0085] Weigh the initial mass m1 of the sample, place the sample in a vacuum drying oven at 60 °C, record the mass of the sample every 1 h and denote it as m2. The total drying time is 12 h. Repeat the process 10 times to obtain the water retention rate within 12 h. The specific calculation formula is as follows:

[0086]

[0087] In the formula, W is the water retention rate (%) of the dust suppressant material sample, m1 is the initial mass (g) of the coal sample sprayed with the dust suppressant material, and m2 is the mass (g) of the coal sample after a certain period of time.

[0088] The water retention test results are shown in Table 1 below.

[0089] Table 1

[0090]

[0091]

[0092] 2. Dust suppression performance test

[0093] Specific process: Place the sample in a simulated experimental platform with a wind speed of 12 m / s, and use a handheld laser particle counter (9306-V2) to detect the concentrations of PM 2.5 and PM 10 , and record them as C0. Then spray a quantitative amount of dust suppressant material evenly on the pulverized coal. After 48 h, place the sample in a simulated test platform at 12 m / s to detect the concentrations of PM2.5 and PM10, and record them as C1.

[0094] The data are measured 3 times and the average value is taken. The specific calculation formula is as follows:

[0095]

[0096] In the formula, S is the dust suppression rate (%), C0 is the initial concentration (μg / m 3 ) of PM2.5 and PM10, and C1 is the concentration (μg / m 2.5 and PM 10 ) of PM 3 after spraying each dust suppressant material and water.

[0097] 3. Crust hardness test

[0098] Specific process: Weigh 5 g of pulverized coal with an electronic balance and spread it flat in a petri dish. Evenly spray 10 g of dust suppressant solution on the coal sample. Place the sample in a constant temperature drying oven at 50 °C for 6 h, and use a Shore hardness tester to record the hardness value of each sample.

[0099] The crust hardness test results are shown in Table 2 below.

[0100] Table 2

[0101]

[0102]

[0103] When the multiple-reinforced network dust suppression material solution prepared by the present invention is sprayed on a piled coal heap, by virtue of its excellent dust suppression property and water retention property, combined with its good film-forming property, a dense protective film is formed on the surface of the coal heap to prevent the flying of coal dust.

[0104] Certainly, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by those skilled in the art within the substantial scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. A preparation method of a multiple-reinforced network dust suppression material for suppressing coal pile dust, characterized in that, Specifically, it includes the following steps: S1: Add 200 ml of distilled water to a beaker. At room temperature, dissolve 1 g of soy protein isolate in water, then add 0.5 g of gum arabic and stir. Add glacial acetic acid and sodium hydroxide to adjust the pH to 7 to obtain mixture I; S2: Place mixture I in a magnetic stirring constant temperature water bath and stir at 30 °C for 3 h to fully dissolve; S3: Raise the temperature of the water bath to 95 °C and continue stirring for 5 h to obtain glycosylated mixture I; S4: Cool the glycosylated mixture I in a water bath to room temperature. Add 0.4 g of transglutaminase to the glycosylated mixture I, and then place it in a water bath at 35 °C to react for 2 h to obtain mixture II; S5: After the reaction, raise the temperature of the water bath to 95 °C for 20 min for enzyme inactivation treatment; S6: Lower the temperature of the water bath to 80 °C. Add 0.4 g of 5% dilute glutaraldehyde to mixture II and react for 30 min to obtain mixture III; S7: Cool mixture III to room temperature, add 2 g of lauryldimethylamine oxide and 0.4 g of glycerol, and stir magnetically in a magnetic stirring water bath at 30 °C for 30 min to prepare a multi-reinforced network dust suppressant material.

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