Wind-erosion-resistant and rain-resistant dust suppression material suitable for coal mine and preparation method of wind-erosion-resistant and rain-resistant dust suppression material

Abstract

The invention discloses a wind-erosion-resistant and rain-resistant dust suppression material suitable for a coal mine and a preparation method thereof, belongs to the technical field of dust prevention and control, and aims at solving the problems that an existing material is poor in weather resistance, difficult to suppress dust for a long time and the like. The dust suppression material comprises the following raw materials: flaxseed gum, tartaric acid, borax, hydrogen peroxide, copper sulfate, ammonium persulfate, alkyl glycoside and distilled water. A finished product is obtained by preparing a flaxseed gum aqueous solution, an oxidation solution and modified product I and II aqueous solutions, adjusting pH and adding a wetting agent. When the dust suppression material is applied, the water solution of the dust suppression material is uniformly sprayed on a dust production area of coal mining, transportation or stockpiling, a wind-erosion-resistant and rain-resistant consolidation layer can be formed, the dust suppression efficiency on PM10 reaches 98.61%, the dust suppression efficiency on PM2.5 reaches 94.60%, the raw materials are non-toxic and harmless and biodegradable, the dust suppression material has the characteristics of efficient dust suppression, long-acting durability and environmental protection, and the dust suppression material can be widely applied to the fields of coal mining, transportation or stockpiling. The important application value is realized in the field of coal mine dust treatment.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of dust control, in particular to an anti-erosion and rain-resistant dust suppression material suitable for coal mines and a preparation method thereof. BACKGROUND

[0002] A large amount of dust is generated in the process of mining, transportation and storage of coal mines, which seriously threatens the occupational health of workers and even causes pneumoconiosis. At present, common dust control technologies include spray dust suppression, ventilation dust removal and the use of chemical dust suppression. The spray dust suppression method is simple to operate, but the dust suppression time is short, the dust is easy to be raised again after water evaporation, and the effect is difficult to maintain under the condition of underground ventilation. Although the ventilation dust removal can remove the dust-containing airflow, the system has high energy consumption, the application range is limited, and it is difficult to suppress the secondary diffusion of dust. Therefore, it is an urgent need in the field of coal mine dust control to develop efficient, durable and environmentally friendly chemical dust suppression materials.

[0003] Chemical dust suppressants can capture, infiltrate and bond dust particles to form a solidified layer with certain strength, thereby achieving long-acting dust suppression. There are various types of existing dust suppressants, such as moisture-absorbing and water-retaining type, bonding type, and coagulation type. However, under the complex working conditions of coal mines, the application effect of traditional dust suppressants is often limited. On the one hand, the mechanical strength of the solidified layer formed by the dust suppressants is often insufficient, and the solidified layer is easy to be damaged under the disturbance of vehicle rolling, equipment operation or ventilation airflow, affecting the dust suppression effect. On the other hand, most dust suppressants have poor water erosion resistance, and the solidified layer is easy to be damaged under the action of water in the underground wet environment or spray dust suppression, thereby losing the dust suppression ability. In addition, some dust suppressants contain harmful ingredients such as chloride and heavy metals, which may cause potential pollution to the underground environment and surrounding ecology during long-term use. Therefore, it is of great application value to develop a new material that can resist wind erosion, resist rainwater erosion, and has high dust suppression performance and environmental compatibility, in order to solve the dust control problem of coal mines. SUMMARY

[0004] To solve the technical problems that the existing coal mine dust suppression material has poor weather resistance, the solidified layer of the dust suppression material is damaged after experiencing wind erosion and rainwater erosion, thereby being difficult to long-acting suppress dust, the present application discloses an anti-erosion and rain-resistant dust suppression material suitable for coal mines and a preparation method thereof.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical solutions: An anti-erosion and rain-resistant dust suppression material suitable for coal mines, the raw materials include, by weight: 1-5 parts of flaxseed gum, 2-8 parts of tartaric acid, 1-5 parts of borax, 0.5-2 parts of hydrogen peroxide, 0.2-0.5 parts of copper sulfate, 0.5-1 part of ammonium persulfate, 2-5 parts of wetting agent, and the balance is distilled water.

[0006] Preferably, under the condition of 100 mL distilled water, the weight of each raw material is respectively: 0.1 g of flaxseed gum, 0.3 g of tartaric acid, 0.1 g of borax, 0.05 g of hydrogen peroxide, 0.025 g of copper sulfate, 0.05 g of ammonium persulfate, and 0.3 g of wetting agent.

[0007] Preferably, the wetting agent is alkyl polyglycoside (APG0810).

[0008] In addition, the present application also provides a method for preparing the anti-wind and rain erosion dust suppression material suitable for coal mines. S1, preparing a flaxseed gum aqueous solution; S2, preparing an oxidized flaxseed gum aqueous solution; S3, preparing a modified product I aqueous solution; S4, preparing a modified product II aqueous solution; S5, adjusting the pH of the modified product II aqueous solution, adding a wetting agent, and stirring in a magnetic stirrer at room temperature until completely dissolved to obtain a dust suppression material aqueous solution.

[0009] Preferably, S1 specifically comprises: adding flaxseed gum to a certain amount of distilled water, placing it in a water bath environment with a temperature of 40-50℃, heating and stirring for 1.5-2.5 h until the flaxseed gum is completely dissolved to obtain a flaxseed gum aqueous solution.

[0010] Preferably, S2 specifically comprises: adding copper sulfate to the flaxseed gum aqueous solution obtained in S1, stirring until completely dissolved, then adding hydrogen peroxide, stirring in a magnetic stirrer at room temperature for 3.5-4.5 h to obtain an oxidized flaxseed gum aqueous solution.

[0011] Preferably, S3 specifically comprises: adding ammonium persulfate to the oxidized flaxseed gum aqueous solution obtained in S2, stirring until uniformly mixed, then adding tartaric acid, transferring to a water bath kettle with a temperature of 75-85℃, and stirring for 0.8-1.2 h to obtain a modified product I aqueous solution.

[0012] Preferably, S4 specifically comprises: adding borax to the modified product I aqueous solution obtained in S3, continuing to stir at a water bath temperature of 75-85℃ for 0.4-0.6 h to obtain a modified product II aqueous solution.

[0013] Preferably, the pH adjuster is sodium hydroxide, and the solution pH is adjusted to 6.5-7.5.

[0014] The present application also provides the application of the dust suppression material mentioned above in the prevention and control of coal mine dust, which uniformly sprays the dust suppression material aqueous solution to the area where dust is generated during the process of coal mining, transportation or storage, forms a consolidated layer with anti-wind and rain erosion performance, and realizes long-acting dust suppression.

[0015] It should be noted that in the preparation of the wind and rain erosion resistant dust suppression material suitable for coal mines, the selected raw materials have the following characteristics: Linseed gum is a kind of water-soluble linseed polysaccharide extracted from linseed, which is a hydrophilic colloid mainly composed of various acidic and neutral polysaccharides such as xylose, arabinose, rhamnose, galactose, glucose and fucose. As a natural plant extract, linseed gum is non-toxic, harmless and biodegradable, and will not pollute the environment. Linseed gum has excellent adhesion, can effectively capture, wrap and bond dust particles, and linseed gum has excellent film-forming property, which can form a high molecular film on the surface of dust, effectively inhibiting dust raising.

[0016] Tartaric acid is a naturally occurring organic acid, which exists in large quantities in fruits such as grapes, is non-toxic and harmless, and is biodegradable, meeting the green environmental protection requirements. Tartaric acid has excellent water solubility and can be quickly and uniformly mixed with other water-based dust suppressant ingredients, facilitating on-site preparation and mechanized spraying operation. At the same time, the molecule of tartaric acid contains multiple carboxyl groups (-COOH), which can esterify with the hydroxyl groups (-OH) of polysaccharides and other substances, and is an environmentally friendly crosslinking agent.

[0017] Borax is a commonly used crosslinking agent, which can be converted into a form that can be absorbed by plants through the action of soil microorganisms after entering the environment, and can be naturally degraded without long-term accumulation to cause soil compaction or pollution. When dissolved in water, it produces borate ions, which can crosslink with the hydroxyl groups (-OH) on the molecular chain of polysaccharides and other substances.

[0018] Hydrogen peroxide is a commonly used oxidizing agent, and the main reaction product after oxidation is water, which has no pollution to the environment, and the reaction conditions are mild, and the obtained product has good flowability and stability.

[0019] Alkyl polyglycoside (APG0810) is an amphoteric ion surfactant with good wetting properties and good ecological compatibility, and is an internationally recognized preferred "green" functional surfactant.

[0020] The reaction equation of the present application is as follows:

[0021]

[0022] The reaction principle of the present application is as follows: (1) Under the catalysis of copper sulfate, the oxidative degradation process of hydrogen peroxide (H2O2) on linseed gum includes two main ways of molecular chain rupture and functional group oxidation. Copper ions (Cu 2+) Firstly, it catalyzes the decomposition of hydrogen peroxide to generate high-reactivity free radicals (·OH). These free radicals preferentially attack the glycosidic bond (C-O-C) on the polysaccharide molecular chain of flaxseed gum and the carbon-hydrogen bond at the secondary carbon position (such as C2, C3, and C4) of the sugar ring: on the one hand, (·OH) forms a carbon-centered radical on the sugar ring carbon by hydrogen abstraction, which initiates the beta-scission of the glycosidic bond and cuts the long polymer chain into low-molecular-weight fragments; on the other hand, the free radicals attack the hydroxyl groups (-OH) on the sugar ring and gradually oxidize the hydroxyl groups (-OH) to carbonyl groups (-C=O) through a continuous oxidation mechanism. The molecular chain scission and carbonyl oxidation of flaxseed gum together change the properties of flaxseed gum, significantly reducing the bulk viscosity.

[0023] (2) Ammonium persulfate is decomposed by heat to generate sulfate radicals (SO4 - ·), which can abstract the hydrogen on the alpha-carbon of the tartaric acid molecule to activate the carboxyl group (-COOH). The activated carboxyl group of tartaric acid reacts with the hydroxyl group (-OH) on the oxidized flaxseed gum molecular chain to form a covalent ester bond (-COO-) by releasing a molecule of water (H2O). Since one molecule of tartaric acid has two carboxyl groups and one molecule of flaxseed gum contains multiple hydroxyl groups, one molecule of tartaric acid can react with two hydroxyl groups of flaxseed gum, causing the polymerization of the oxidized flaxseed gum small molecules.

[0024] (3) Borax is hydrolyzed in water to generate boric acid. The boron atom in the boric acid molecule is an electron-deficient atom, which reacts with the two adjacent hydroxyl groups (-OH) on the oxidized flaxseed gum molecular chain. The boron atom coordinates with the oxygen atoms of the two hydroxyl groups to form a reversible dynamic covalent bond, boric acid ester bond. One boron atom can simultaneously bind to the hydroxyl groups on multiple different polysaccharide chains, thereby forming cross-linking points between molecules and connecting multiple molecular chains into a three-dimensional network structure.

[0025] Compared with the prior art, the present application provides an anti-erosion and rain-resistant dust suppression material suitable for coal mines and a preparation method and application thereof, which has the following beneficial effects: (1) The present application selects flaxseed gum as the raw material and uses copper sulfate to catalyze the oxidation modification of hydrogen peroxide. The efficiency of metal ion catalysts can be ranked as follows: Cu>Fe>WO4, so CuSO4 with higher catalytic efficiency is selected as the catalyst, which can effectively reduce the cost and improve the catalytic efficiency. At the same time, the reaction conditions of CuSO4 are relatively wide, and the requirements for temperature and pH are lower, which is easy to operate. This step can effectively reduce the molecular weight of flaxseed gum and increase the number of hydroxyl groups (-OH) on the molecular chain, which is beneficial to the subsequent esterification reaction. 2+ ​The high catalytic effect of the tartaric acid promotes the controllable oxidation of the hydrogen peroxide to the flaxseed gum molecular chain, effectively breaks part of the sugar chain and simultaneously oxidizes part of the hydroxyl group to a carbonyl group. The process avoids the problem of difficult spraying application caused by the excessively high viscosity of the flaxseed gum, while retaining the good adhesion performance necessary for the dust suppressant. The reaction condition is mild, the hydrogen peroxide is a commonly used oxidizing agent, and the main reaction product after oxidation is water, which is pollution-free to the environment.

[0026] (2) The tartaric acid molecule contains two polar carboxyl functional groups, which can undergo esterification with the numerous hydroxyl groups in the oxidized flaxseed gum molecular chain, significantly enhancing the cohesion of the oxidized flaxseed gum, making the oxidized flaxseed gum network system more dense, and effectively limiting the penetration and diffusion of water molecules, thereby greatly improving the water resistance of the material. In addition, this cross-linking structure also helps to improve the mechanical strength and structural stability of the material, improving the long-acting dust suppression ability of the dust suppression material.

[0027] (3) The borax produces boric acid through hydrolysis, which undergoes coordination with the hydroxyl groups in the oxidized flaxseed gum molecules to form a dynamic and reversible borate ester bond, allowing one boron atom to bridge multiple different oxidized flaxseed gum molecular chains to form a second cross-linking network. Through the double cross-linking of tartaric acid and borax, the mechanical properties of the material are significantly enhanced, improving the strength and durability of the dust suppression solidified layer, which can effectively resist wind erosion, and the double cross-linking network further limits the migration of water molecules, significantly improving the water resistance of the material. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 is the preparation process flow chart of the present application; Figure 2 is the rain erosion resistance test result graph of the dust suppression material aqueous solution prepared in the examples and comparative examples; Figure 3 is the wind erosion resistance test result graph of the dust suppression material aqueous solution prepared in the examples and comparative examples. DETAILED DESCRIPTION

[0029] The technical solutions in the examples of the present application will be described below in a clear and complete manner. Obviously, the described examples are only a part of the examples of the present application, rather than all the examples. Based on the examples of the present application, all other examples obtained by those skilled in the art without creative labor are within the scope of protection of the present application. Example 1

[0030] (1) In a beaker, 100 mL of distilled water was added, 0.1 g of flaxseed gum was dissolved in the distilled water, and the beaker was placed in a water bath, the temperature was set to 45℃, and heating and stirring were carried out for 2 h until the flaxseed gum was completely dissolved, obtaining a flaxseed gum aqueous solution.

[0031] (2) To the water solution of flaxseed gum, 0.025 g of copper sulfate was added and stirred until dissolved, then 0.03 g of 30% hydrogen peroxide was added, and placed in a magnetic stirrer for stirring for 4 h to obtain the water solution of oxidized flaxseed gum.

[0032] (3) To the water solution of oxidized flaxseed gum, 0.05 g of ammonium persulfate was added and placed in a magnetic stirrer for stirring until uniform, then 0.2 g of tartaric acid was added, and placed in a water bath at 80°C for stirring for 1 h to obtain the water solution of modified product I.

[0033] (4) To the water solution of modified product I, 0.05 g of borax was added, and placed in a water bath at 80°C for stirring for 0.5 h to obtain the water solution of modified product II.

[0034] (5) A certain amount of sodium hydroxide was added to adjust the pH of the water solution of modified product II to neutral, 0.3 g of alkyl polyglycoside (APG0810) was added, and placed in a magnetic stirrer for stirring until dissolved at room temperature to obtain the water solution of dust suppression material. Example 2

[0035] (1) In a beaker, 100 mL of distilled water was added, 0.1 g of flaxseed gum was dissolved in the distilled water, and placed in a water bath, the temperature was set to 45°C, and heated and stirred for 2 h until the flaxseed gum was completely dissolved to obtain the water solution of flaxseed gum.

[0036] (2) To the water solution of flaxseed gum, 0.025 g of copper sulfate was added and stirred until dissolved, then 0.05 g of 30% hydrogen peroxide was added, and placed in a magnetic stirrer for stirring for 4 h to obtain the water solution of oxidized flaxseed gum.

[0037] (3) To the water solution of oxidized flaxseed gum, 0.05 g of ammonium persulfate was added and placed in a magnetic stirrer for stirring until uniform, then 0.3 g of tartaric acid was added, and placed in a water bath at 80°C for stirring for 1 h to obtain the water solution of modified product I.

[0038] (4) To the water solution of modified product I, 0.1 g of borax was added, and placed in a water bath at 80°C for stirring for 0.5 h to obtain the water solution of modified product II.

[0039] (5) A certain amount of sodium hydroxide was added to adjust the pH of the water solution of modified product II to neutral, 0.3 g of alkyl polyglycoside (APG0810) was added, and placed in a magnetic stirrer for stirring until dissolved at room temperature to obtain the water solution of dust suppression material. Example 3

[0040] (1) In a beaker, 100 mL of distilled water was added, 0.1 g of flaxseed gum was dissolved in the distilled water, and placed in a water bath, the temperature was set to 45°C, and heated and stirred for 2 h until the flaxseed gum was completely dissolved to obtain the water solution of flaxseed gum.

[0041] (2) To the water solution of flaxseed gum, 0.025 g of copper sulfate was added and stirred until dissolved, then 0.07 g of 30% hydrogen peroxide was added, and placed in a magnetic stirrer for stirring for 4 h to obtain the water solution of oxidized flaxseed gum.

[0042] (3) To the water solution of oxidized flaxseed gum, 0.05 g of ammonium persulfate was added and placed in a magnetic stirrer for stirring until uniform, then 0.3 g of tartaric acid was added, and placed in a water bath at 80°C for stirring for 1 h to obtain the water solution of modified product I.

[0043] (4) To the water solution of modified product I, 0.1 g of borax was added, and placed in a water bath at 80°C for stirring for 0.5 h to obtain the water solution of modified product II.

[0044] (5) A certain amount of sodium hydroxide was added to adjust the pH of the water solution of modified product II to neutral, 0.3 g of alkyl polyglycoside (APG0810) was added, and placed in a magnetic stirrer for stirring until dissolved at room temperature to obtain the water solution of dust suppression material. Example 4

[0045] (1) In a beaker, 100 mL of distilled water was added, 0.2 g of flaxseed gum was dissolved in the distilled water, and placed in a water bath, the temperature was set to 45°C, and heated and stirred for 2 h until the flaxseed gum was completely dissolved to obtain the water solution of flaxseed gum.

[0046] (2) To the water solution of flaxseed gum, 0.025 g of copper sulfate was added and stirred until dissolved, then 0.03 g of 30% hydrogen peroxide was added, and placed in a magnetic stirrer for stirring for 4 h to obtain the water solution of oxidized flaxseed gum.

[0047] (3) To the water solution of oxidized flaxseed gum, 0.05 g of ammonium persulfate was added and placed in a magnetic stirrer for stirring until uniform, then 0.3 g of tartaric acid was added, and placed in a water bath at 80°C for stirring for 1 h to obtain the water solution of modified product I.

[0048] (4) To the water solution of modified product I, 0.15 g of borax was added, and placed in a water bath at 80°C for stirring for 0.5 h to obtain the water solution of modified product II.

[0049] (5) A certain amount of sodium hydroxide was added to adjust the pH of the water solution of modified product II to neutral, 0.3 g of alkyl polyglycoside (APG0810) was added, and placed in a magnetic stirrer for stirring until dissolved at room temperature to obtain the water solution of dust suppression material. Example 5

[0050] (1) In a beaker, 100 mL of distilled water was added, 0.2 g of flaxseed gum was dissolved in the distilled water, and placed in a water bath, the temperature was set to 45°C, and heated and stirred for 2 h until the flaxseed gum was completely dissolved to obtain the water solution of flaxseed gum.

[0051] (2) Add 0.025 g of copper sulfate to the water solution of flaxseed gum, stir until dissolved, then add 0.05 g of 30% hydrogen peroxide, place in a magnetic stirrer and stir for 4 h to obtain the water solution of oxidized flaxseed gum.

[0052] (3) Add 0.05 g of ammonium persulfate to the water solution of oxidized flaxseed gum and stir until uniform, then add 0.4 g of tartaric acid, place in a 80°C water bath and stir for 1 h to obtain the water solution of modified product I.

[0053] (4) Add 0.05 g of borax to the water solution of modified product I, place in a 80°C water bath and stir for 0.5 h to obtain the water solution of modified product II.

[0054] (5) Add a certain amount of sodium hydroxide to adjust the pH of the water solution of modified product II to neutral, add 0.3 g of alkyl polyglycoside (APG0810) to a magnetic stirrer and stir until dissolved at room temperature to obtain the water solution of dust suppression material. Example 6

[0055] (1) Add 100 mL of distilled water to a beaker, dissolve 0.2 g of flaxseed gum in the distilled water, place in a water bath, set the temperature to 45°C, and heat and stir for 2 h until the flaxseed gum is completely dissolved to obtain the water solution of flaxseed gum.

[0056] (2) Add 0.025 g of copper sulfate to the water solution of flaxseed gum, stir until dissolved, then add 0.07 g of 30% hydrogen peroxide, place in a magnetic stirrer and stir for 4 h to obtain the water solution of oxidized flaxseed gum.

[0057] (3) Add 0.05 g of ammonium persulfate to the water solution of oxidized flaxseed gum and stir until uniform, then add 0.2 g of tartaric acid, place in a 80°C water bath and stir for 1 h to obtain the water solution of modified product I.

[0058] (4) Add 0.1 g of borax to the water solution of modified product I, place in a 80°C water bath and stir for 0.5 h to obtain the water solution of modified product II.

[0059] (5) Add a certain amount of sodium hydroxide to adjust the pH of the water solution of modified product II to neutral, add 0.3 g of alkyl polyglycoside (APG0810) to a magnetic stirrer and stir until dissolved at room temperature to obtain the water solution of dust suppression material. Example 7

[0060] (1) In a beaker, 100 mL of distilled water was added, 0.3 g of flaxseed gum was dissolved in distilled water, and placed in a water bath, the temperature was set to 45℃, heated and stirred for 2h until the flaxseed gum was completely dissolved, to obtain a flaxseed gum aqueous solution.

[0061] (2) 0.025 g of copper sulfate was added to the flaxseed gum aqueous solution, stirred until dissolved, then 0.03 g of 30% hydrogen peroxide was added, placed in a magnetic stirrer and stirred for 4h, to obtain an oxidized flaxseed gum aqueous solution.

[0062] (3) 0.05 g of ammonium persulfate was added to the oxidized flaxseed gum aqueous solution and stirred evenly in a magnetic stirrer, then 0.4 g of tartaric acid was added, placed in an 80℃ water bath and stirred for 1h, to obtain a modified product I aqueous solution.

[0063] (4) 0.1 g of borax was added to the modified product I aqueous solution, placed in an 80℃ water bath and stirred for 0.5h, to obtain a modified product II aqueous solution.

[0064] (5) A certain amount of sodium hydroxide was added to adjust the pH of the modified product II aqueous solution to neutral, 0.3 g of alkyl polyglycoside (APG0810) was added and placed in a magnetic stirrer, stirred at room temperature until dissolved, to obtain a dust suppression material aqueous solution. Example 8

[0065] (1) In a beaker, 100 mL of distilled water was added, 0.3 g of flaxseed gum was dissolved in distilled water, and placed in a water bath, the temperature was set to 45℃, heated and stirred for 2h until the flaxseed gum was completely dissolved, to obtain a flaxseed gum aqueous solution.

[0066] (2) 0.025 g of copper sulfate was added to the flaxseed gum aqueous solution, stirred until dissolved, then 0.05 g of 30% hydrogen peroxide was added, placed in a magnetic stirrer and stirred for 4h, to obtain an oxidized flaxseed gum aqueous solution.

[0067] (3) 0.05 g of ammonium persulfate was added to the oxidized flaxseed gum aqueous solution and stirred evenly in a magnetic stirrer, then 0.2 g of tartaric acid was added, placed in an 80℃ water bath and stirred for 1h, to obtain a modified product I aqueous solution.

[0068] (4) 0.15 g of borax was added to the modified product I aqueous solution, placed in an 80℃ water bath and stirred for 0.5h, to obtain a modified product II aqueous solution.

[0069] (5) A certain amount of sodium hydroxide was added to adjust the pH of the modified product II aqueous solution to neutral, 0.3 g of alkyl polyglycoside (APG0810) was added and placed in a magnetic stirrer, stirred at room temperature until dissolved, to obtain a dust suppression material aqueous solution.

[0070] Example 9 (1) In a beaker, 100 mL of distilled water was added, 0.3 g of flaxseed gum was dissolved in distilled water, and placed in a water bath, the temperature was set to 45 DEG C, heated and stirred for 2 h until the flaxseed gum was completely dissolved, to obtain a flaxseed gum aqueous solution.

[0071] (2) 0.025 g of copper sulfate was added to the flaxseed gum aqueous solution, stirred until dissolved, then 0.07 g of 30% hydrogen peroxide was added, placed in a magnetic stirrer and stirred for 4 h, to obtain an oxidized flaxseed gum aqueous solution.

[0072] (3) 0.05 g of ammonium persulfate was added to the oxidized flaxseed gum aqueous solution and placed in a magnetic stirrer and stirred until uniform, then 0.3 g of tartaric acid was added, placed in an 80 DEG C water bath and stirred for 1 h, to obtain a modified product I aqueous solution.

[0073] (4) 0.05 g of borax was added to the modified product I aqueous solution, placed in an 80 DEG C water bath and stirred for 0.5 h, to obtain a modified product II aqueous solution.

[0074] (5) A certain amount of sodium hydroxide was added to adjust the pH of the modified product II aqueous solution to neutral, 0.3 g of alkyl polyglycoside (APG0810) was added, placed in a magnetic stirrer and stirred until dissolved at room temperature, to obtain a dust suppression material aqueous solution.

[0075] Comparative Example 1 (1) In a beaker, 100 mL of distilled water was added, 0.3 g of flaxseed gum was dissolved in distilled water, and placed in a water bath, the temperature was set to 45 DEG C, heated and stirred for 2 h until the flaxseed gum was completely dissolved, to obtain a flaxseed gum aqueous solution.

[0076] (2) 0.025 g of copper sulfate was added to the flaxseed gum aqueous solution, stirred until dissolved, then 0.05 g of 30% hydrogen peroxide was added, placed in a magnetic stirrer and stirred for 4 h, to obtain a dust suppression material aqueous solution.

[0077] Comparative Example 2 0.3 g of tartaric acid was dissolved in 100 mL of distilled water, stirred in an 80 DEG C water bath for 1 h until completely dissolved, to obtain a dust suppression material aqueous solution.

[0078] The dust suppression materials prepared in Examples 1-9 and Comparative Examples 1-2 were subjected to rain erosion resistance test, wind erosion resistance test and dust suppression performance test.

[0079] Rain erosion resistance test: coal samples with the same initial mass were placed in a culture dish, evenly sprayed with equal amounts of solutions of Examples 1-9 and Comparative Examples 1-2, and placed in a 50 DEG C vacuum drying oven until completely dried, and the mass at this time was recorded m0, 10 min spray test was performed on the materials of Examples 1-9 and Comparative Examples 1-2. After the test, the coal samples were again dried in a 50°C vacuum drying oven until completely dry, and the mass at this time was recorded m 1, the rain erosion resistance was calculated according to the following formula: ; μ was the rain erosion resistance (%), m 0 was the initial mass (g), m 1 was the mass after spraying, m was the mass of the petri dish (g).

[0080] It can be seen from Figure 2 that the 10 min rain erosion resistance of the materials prepared in Examples 1-9 was all above 85%, while the 10 min rain erosion resistance of the materials prepared in Comparative Example 1 and Comparative Example 2 was only 46.03% and 32.15%. This is because the dust suppression material prepared by the present application is crosslinked by tartaric acid, which enhances the cohesion of the dust suppression material, making the oxidized flaxseed gum network system more dense, which can effectively limit the penetration and diffusion of water molecules. At the same time, the different oxidized flaxseed gum molecular chains are connected by borate ester bonds, which enhances the mechanical properties of the dust suppression material and improves the strength and durability of the dust suppression solidified layer, and the rain erosion resistance is stronger.

[0081] Wind erosion resistance and dust suppression performance experiment: an equal amount of coal powder was placed in a petri dish, and then placed on a wind erosion simulation platform, with a wind speed of 12 m / s, to perform wind erosion experiment and dust suppression efficiency determination. First, a handheld laser particle counter was used to detect the initial concentration of PM2.5 and PM10 C 0, then an equal amount of solution of Examples 1-9 and Comparative Examples 1-2 was uniformly sprayed into the petri dish, and placed in a constant temperature drying oven at 50°C until completely dry, and the weight at this time was recorded N 0. The samples sprayed with different solutions and dried were placed on the wind erosion simulation platform at a wind speed of 12 m / s for 10 min, and the PM2.5 and PM10 concentrations at this time were again measured using a handheld laser particle counter, and recorded as C 1, and the weight at this time was recorded as N 1. The data were the average of three measurements. The wind erosion resistance and dust suppression rate were calculated according to the following formula: ; α was the wind erosion resistance (%), N 0 was the initial mass (g), N 1 was the mass after wind erosion (g), N was the mass of the petri dish (g).

[0082] ; η Dust suppression rate (%) = [(C0-C1) / C0] x 100 C 0 is the initial concentration (μg / m 3 ) of PM2.5 and PM10, C 1 is the concentration (μg / m 3 ) of PM2.5 and PM10 after spraying the solution.

[0083] Table 1: Dust suppression performance test results

[0084] From Figure 3 and Table 1, the wind erosion resistance rate of the material prepared in Examples 1-9 is all above 90% for 10 min, while the wind erosion resistance rate of the material prepared in Comparative Example 1 and Comparative Example 2 is 52.15% and 46.90% respectively for 10 min, and the dust suppression efficiency of the material prepared in Examples 1-9 is significantly higher than that of the material prepared in Comparative Example 1 and Comparative Example 2. This is because the dust suppression material prepared in the application uses oxidized flaxseed gum as raw material, which has excellent adhesion performance, can effectively capture, wrap and bond dust particles, and at the same time has excellent film-forming property, can form a solid layer on the surface of dust. By double crosslinking of the oxidized flaxseed gum with tartaric acid and boric acid, the strength and mechanical properties of the solid layer are significantly enhanced, so that it has excellent wind erosion resistance and dust suppression performance.

[0085] In summary, the anti-erosion and rain-resistant dust suppression material prepared in the application has excellent dust suppression performance and anti-erosion and rain-resistant properties, and can better resist the harsh environment of coal mines and achieve long-acting dust suppression. It effectively solves the problem of poor weather resistance of dust suppression materials, and has good social and economic benefits.

[0086] The above examples are only used to illustrate the technical solutions of the present application, but not to limit it; although the present application has been described in detail with reference to the foregoing examples, for those skilled in the art, the technical solutions recorded in the foregoing examples can still be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions claimed by the present application.

Claims

1. A wind-erosion-resistant and rain-resistant dust suppression material suitable for coal mines, characterized in that, The raw materials, by weight, include: 1-5 parts flaxseed gum, 2-8 parts tartaric acid, 1-5 parts borax, 0.5-2 parts hydrogen peroxide, 0.2-0.5 parts copper sulfate, 0.5-1 part ammonium persulfate, 2-5 parts wetting agent, and the balance being distilled water.

2. The wind erosion-resistant and rain-resistant dust suppression material suitable for coal mines according to claim 1, characterized in that, Under the condition of 100mL distilled water, the weights of each raw material are as follows: 0.1g linseed gum, 0.3g tartaric acid, 0.1g borax, 0.05g hydrogen peroxide, 0.025g copper sulfate, 0.05g ammonium persulfate, and 0.3g wetting agent.

3. A wind-erosion-resistant and rain-resistant dust suppression material suitable for coal mines according to claim 1 or 2, characterized in that, The wetting agent is an alkyl glycoside (APG0810).

4. A method for preparing a wind-erosion-resistant and rain-resistant dust suppression material suitable for coal mines as described in claim 3, characterized in that, The steps are as follows: S1. Prepare flaxseed gum aqueous solution; S2. Prepare an aqueous solution of oxidized flaxseed gum; S3. Prepare an aqueous solution of modified product I; S4. Prepare an aqueous solution of modified product II; S5. Adjust the pH of the modified product II aqueous solution, add a wetting agent, and stir in a magnetic stirrer at room temperature until completely dissolved to obtain the dust suppression material aqueous solution.

5. The method for preparing a wind-erosion-resistant and rain-resistant dust suppression material suitable for coal mines according to claim 4, characterized in that, S1 specifically includes: adding flaxseed gum to a measured amount of distilled water, placing it in a water bath at a temperature of 40-50℃, heating and stirring for 1.5-2.5 hours until the flaxseed gum is completely dissolved, to obtain an aqueous solution of flaxseed gum.

6. The method for preparing a wind-erosion-resistant and rain-resistant dust suppression material suitable for coal mines according to claim 5, characterized in that, S2 specifically includes: adding copper sulfate to the flaxseed gum aqueous solution obtained in S1, stirring until completely dissolved, adding hydrogen peroxide, and stirring at room temperature in a magnetic stirrer for 3.5-4.5 hours to obtain an oxidized flaxseed gum aqueous solution.

7. The method for preparing a wind-erosion-resistant and rain-resistant dust suppression material suitable for coal mines according to claim 6, characterized in that, S3 specifically includes: adding ammonium persulfate to the oxidized linseed gum aqueous solution obtained in S2, stirring magnetically until the mixture is uniform, adding tartaric acid, transferring to a water bath at 75-85℃ and stirring for 0.8-1.2 hours to obtain the modified product I aqueous solution.

8. A method for preparing a wind-erosion-resistant and rain-resistant dust suppression material suitable for coal mines according to claim 7, characterized in that, S4 specifically includes: adding borax to the aqueous solution of modified product I obtained in S3, maintaining a water bath temperature of 75-85℃ and stirring for 0.4-0.6h to obtain an aqueous solution of modified product II.

9. A method for preparing a wind-erosion-resistant and rain-resistant dust suppression material suitable for coal mines according to claim 8, characterized in that, The pH adjuster is sodium hydroxide, and the solution pH is adjusted to 6.5-7.

5.

10. The application of the wind-erosion-resistant and rain-resistant dust suppression material suitable for coal mines according to any one of claims 1-3, or the dust suppression material prepared by the preparation method according to any one of claims 4-9, in coal mine dust control, characterized in that... The dust suppression material aqueous solution is evenly sprayed onto areas where dust is generated during coal mining, transportation, or storage to form a solidified layer with wind erosion and rain resistance, thus achieving long-term dust suppression.

Images