Spraying dust-settling material with wetting and adhesion dual properties and preparation method of spraying dust-settling material

Abstract

The invention discloses a spray dust-settling material with both wetting and adhesion properties and a preparation method thereof, the spray dust-settling material is mainly composed of the following raw materials by weight: 0.01-0.03 part of an inorganic salt comprising one or more of magnesium chloride and calcium chloride; 0.03 to 0.05 part of an anionic surfactant, namely sodium dodecyl benzene sulfonate; 0.02 to 0.04 part of a non-ionic surface active agent, namely fatty alcohol-polyoxyethylene ether; 0.03 to 0.06 part of a polymer, namely hydroxypropyl methyl cellulose; 0.02 to 0.05 part of a water-retaining agent, namely sodium polyacrylate; and the balance of deionized water. The spraying dust-settling material prepared by the invention has good wettability, adhesiveness and water-retaining property, can realize efficient wetting, adhesion and sedimentation of mine suspended dust, and meanwhile, effectively inhibits moisture evaporation of deposited dust and prevents secondary raising of dust.

Description

Technical Field

[0001] This invention belongs to the field of dust control technology, specifically relating to a spray dust suppression material and its preparation method that combines both wetting and adhesion properties. Background Technology

[0002] Among related technologies, water spray is the most widely used in dust control in mines. However, due to the strong hydrophobicity of dust, the dust suppression effect of water spray is not good. To improve the wetting properties of the solution, wetting agents are commonly added to reduce the surface tension of the solution. Although the dust suppression performance of solution spray is improved, it still cannot meet the needs of dust control in mines. Analyzing the dust suppression performance of solution wetting, although adding wetting agents can improve the wetting properties of the solution, the significant reduction in the surface tension of the solution also leads to a significant weakening of the ability of droplets to adhere to dust. This causes secondary separation to easily occur after the droplets come into contact with the dust, making it impossible to achieve efficient dust suppression. Summary of the Invention

[0003] The purpose of this invention is to provide a spray dust suppression material and its preparation method that take into account both wetting and adhesion properties. The prepared dust suppression material has good wetting, adhesion and water retention properties, and can form a small-diameter droplet field, which can effectively capture dust particles during mining and achieve efficient dust control in mines.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: A spray dust suppression material that combines both wetting and adhesion properties, the spray dust suppression material is mainly composed of the following raw materials, in the following weight proportions: Inorganic salts 0.01-0.03 parts 0.03-0.05 parts of anionic surfactant 0.02-0.04 parts of nonionic surfactant Polymer 0.03-0.06 parts Water-retaining agent 0.02-0.05 parts The rest is deionized water.

[0005] As a further aspect of the present invention: the spray dust suppression material is mainly composed of the following components, in the following weight proportions: 0.03 parts of inorganic salts 0.05 parts of anionic surfactant 0.03 parts of nonionic surfactant 0.05 parts of polymer 0.04 parts water-retaining agent The rest is deionized water.

[0006] As a further aspect of the present invention: the inorganic salt is selected from one or more of magnesium chloride and calcium chloride; the anionic surfactant is sodium dodecylbenzenesulfonate; the nonionic surfactant is fatty alcohol polyoxyethylene ether; the polymer is hydroxypropyl methylcellulose; and the water-retaining agent is sodium polyacrylate.

[0007] As a further aspect of the present invention: the inorganic salt is selected from magnesium chloride and calcium chloride, and the ratio of magnesium chloride to calcium chloride is 1:1.

[0008] This invention also discloses a method for preparing a spray dust suppression material that combines both wetting and adhesion properties, comprising the following steps: (1) Inorganic salts, polymers and water-retaining agents are placed in a ball mill according to the weight ratio and ground to prepare mixture I. The required rotation speed is 200-300 r / min and the grinding time is 20-30 min. (2) Anionic surfactant and nonionic surfactant are placed in a magnetic stirrer at a weight ratio and stirred evenly to prepare mixture II. The required stirring speed is 100-200 r / min and the stirring time is 30-50 min. (3) Add mixture I, mixture II and deionized water into the mixer according to the weight ratio, stir at a speed of 60-100 r / min and for a time of 10-20 min to prepare a spray dust suppression material that has both wetting and adhesion properties.

[0009] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. Sodium dodecylbenzenesulfonate utilizes its hydrophilic groups to form an adsorption layer on the surface of deionized water to reduce the contact between air and the solution, thereby enhancing the solution's wetting properties. However, the hydrophilic groups of sodium dodecylbenzenesulfonate carry a negative charge, and due to electrostatic repulsion, the density of this adsorption layer is not high. To address this, a small amount of fatty alcohol polyoxyethylene ether is added. This surfactant forms an adsorption layer on the solution surface by forming hydrogen bonds with water molecules, effectively filling the pores between the hydrophilic groups of sodium dodecylbenzenesulfonate. Under the synergistic effect of the two different adsorption mechanisms of sodium dodecylbenzenesulfonate and fatty alcohol polyoxyethylene ether, the surface tension of deionized water is significantly reduced, and the dust-reducing performance of the solution is greatly improved.

[0010] 2. While adding sodium dodecylbenzenesulfonate and fatty alcohol polyoxyethylene ether to deionized water significantly reduces the surface tension of the solution, it does not significantly improve dust settling time. Currently, to improve water quality and prevent nozzle clogging, some coal mines use water purifiers to filter the dust-reducing water. However, while removing impurities, inorganic salts are also removed, weakening the wetting performance of the dust-reducing water. Therefore, this invention utilizes one or more of magnesium chloride or calcium chloride. The released calcium or magnesium ions neutralize the negative charge on the dust surface, significantly reducing the electrostatic repulsion between particles. Simultaneously, it compresses the thickness of the "electric double layer" formed on the dust surface, shortening the effective repulsion distance between particles, making them easier to approach and aggregate. Furthermore, calcium or magnesium ions can significantly neutralize some of the charge at the hydrophilic end of sodium dodecylbenzenesulfonate, reducing intermolecular repulsion and making it easier for surfactant molecules to aggregate into micelles. More surfactant molecules will transfer from the aqueous phase to the gas-liquid or liquid-solid interface, forming a denser adsorption layer and significantly improving the dust-reducing performance of the solution.

[0011] 3. Although the addition of inorganic salts, sodium dodecylbenzenesulfonate, and fatty alcohol polyoxyethylene ether improved the poor dust suppression performance of the solution due to the strong hydrophobicity of dust, the significantly reduced surface tension of the solution also significantly weakened the ability of droplets to adhere to dust, making it easy for droplets to separate from dust upon contact, thus failing to achieve efficient dust suppression. Therefore, without affecting the existing efficient wetting performance of the solution, hydroxypropyl methylcellulose was added. Utilizing its hydrophilic long molecular structure, it combines with water molecules, causing the polymer chains to gradually extend from a coiled state to form a spatial network structure. This increases the resistance of water molecules during flow, thereby increasing the viscosity of the water. Without altering the solution's wetting properties, the ability of the solution to adhere to dust is significantly improved, achieving the preparation of a solution with both strong wetting and adhesion properties for dust suppression.

[0012] 4. After the spray effectively captures and settles suspended dust in the mine air, the evaporation of water can easily cause the deposited dust to be re-raised. Therefore, while ensuring good wetting and adhesion properties of the spray, it is also necessary to slow down the evaporation of the solution. Sodium polyacrylate, as a highly efficient water-retaining agent, utilizes its own carboxylate ions to achieve electrostatic hydration with minimal impact on the atomization performance of the solution. At the same time, it can form hydrogen bonds with water molecules to achieve hydrogen bond hydration, significantly improving the solution's resistance to evaporation.

[0013] 5. The dust suppression spray material proposed in this invention has dual properties of wetting and adhesion adsorption. The materials used in its preparation are all green and environmentally friendly, and the preparation process is simple and low in cost. It can achieve multiple properties such as strong wetting, adhesion and water retention in the solution, and meet the special requirements of efficient dust suppression spray in mines. Detailed Implementation

[0014] This invention discloses a spray dust suppression material that combines both wetting and adhesion properties, and its preparation method. The spray dust suppression material is mainly composed of the following raw materials, in the following weight proportions: Inorganic salts 0.01-0.03 parts 0.03-0.05 parts of anionic surfactant 0.02-0.04 parts of nonionic surfactant Polymer 0.03-0.06 parts Water-retaining agent 0.02-0.05 parts The rest is deionized water.

[0015] Furthermore, the inorganic salt is selected from one or more of magnesium chloride and calcium chloride, in parts by weight of 0.01-0.03. Magnesium chloride and calcium chloride are salts widely found in nature and can affect the adsorption state of ionic surfactants through electrostatic interactions.

[0016] Furthermore, the anionic surfactant is sodium dodecylbenzenesulfonate, in parts by weight of 0.03-0.05. Sodium dodecylbenzenesulfonate is characterized by stable performance and biodegradability. It can effectively improve the wetting properties of solutions and has a good synergistic effect with nonionic surfactants. It is one of the most widely produced and applied anionic surfactants currently available.

[0017] Furthermore, the nonionic surfactant is a fatty alcohol polyoxyethylene ether, with a weight of 0.03-0.05 parts. Fatty alcohol polyoxyethylene ether is prepared by an addition reaction between natural or synthetic fatty alcohols and ethylene oxide. Its molecular structure combines hydrophobic fatty alcohol segments and hydrophilic polyoxyethylene ether segments, exhibiting good biodegradability and significantly improving solution wetting properties.

[0018] Furthermore, the polymer is hydroxypropyl methylcellulose, in parts by weight of 0.03-0.06. Hydroxypropyl methylcellulose is a non-ionic cellulose ether produced by chemical modification of natural cellulose, possessing both biocompatibility and biodegradability.

[0019] Furthermore, the water-retaining agent is sodium polyacrylate, in parts by weight of 0.02-0.05. Sodium polyacrylate is a modified biodegradable formulation, a functional polymer material that can be gradually decomposed into small molecules under specific environmental conditions.

[0020] The physical bonding between sodium polyacrylate and water molecules in this invention:

[0021] Electrostatic hydration:

[0022] Hydrogen bonding:

[0023] When sodium polyacrylate dissolves in water, it dissociates a large number of negatively charged carboxylate ions. On the one hand, the negative charge of the carboxylate ions attracts the positively charged end of water molecules, achieving electrostatic hydration; on the other hand, the oxygen atom of the carboxylate ion forms hydrogen bonds with the hydrogen atom of the water molecule, achieving hydrogen bonding between sodium polyacrylate and water molecules.

[0024] Example 1:

[0025] (1) 0.03 parts magnesium chloride, 0.03 parts hydroxypropyl methylcellulose and 0.04 parts sodium polyacrylate were placed in a ball mill and ground in a certain weight ratio to prepare mixture I. The required rotation speed was 200-300 r / min and the grinding time was 20-30 min. (2) 0.03 parts sodium dodecylbenzenesulfonate and 0.03 parts fatty alcohol polyoxyethylene ether are placed in a magnetic stirrer according to the weight ratio and stirred evenly to prepare mixture II. The required stirring speed is 100-200 r / min and the stirring time is 30-50 min; (3) Add mixture I, mixture II and deionized water into the mixer according to the weight ratio, stir at a speed of 60-100 r / min and for a time of 10-20 min to prepare a spray dust suppression material that has both wetting and adhesion properties.

[0026] For example, taking 100 parts as an example, you need 0.03 parts magnesium chloride, 0.03 parts hydroxypropyl methylcellulose, 0.04 parts sodium polyacrylate, 0.03 parts sodium dodecylbenzenesulfonate, and 0.03 parts fatty alcohol polyoxyethylene ether, with the remaining parts being deionized water. If 100 parts is 100g, then you need 0.03g magnesium chloride, 0.03g hydroxypropyl methylcellulose, 0.04g sodium polyacrylate, 0.03g sodium dodecylbenzenesulfonate, and 0.03g fatty alcohol polyoxyethylene ether, with the remaining amount being deionized water.

[0027] Example 2:

[0028] (1) 0.02 parts magnesium chloride, 0.04 parts hydroxypropyl methylcellulose and 0.05 parts sodium polyacrylate were placed in a ball mill and ground in a certain weight ratio to prepare mixture I. The required rotation speed was 200-300 r / min and the grinding time was 20-30 min. (2) 0.04 parts sodium dodecylbenzenesulfonate and 0.03 parts fatty alcohol polyoxyethylene ether were placed in a magnetic stirrer at a weight ratio and stirred evenly to prepare mixture II. The required stirring speed was 100-200 r / min and the stirring time was 30-50 min. (3) Add mixture I, mixture II and deionized water into the mixer according to the weight ratio, stir at a speed of 60-100 r / min and for a time of 10-20 min to prepare a spray dust suppression material that has both wetting and adhesion properties.

[0029] Example 3:

[0030] (1) 0.03 parts calcium chloride, 0.03 parts hydroxypropyl methylcellulose and 0.05 parts sodium polyacrylate were placed in a ball mill and ground in a certain weight ratio to prepare mixture I. The required rotation speed was 200-300 r / min and the grinding time was 20-30 min. (2) 0.03 parts sodium dodecylbenzenesulfonate and 0.03 parts fatty alcohol polyoxyethylene ether are placed in a magnetic stirrer according to the weight ratio and stirred evenly to prepare mixture II. The required stirring speed is 100-200 r / min and the stirring time is 30-50 min; (3) Add mixture I, mixture II and deionized water into the mixer according to the weight ratio, stir at a speed of 60-100 r / min and for a time of 10-20 min to prepare a spray dust suppression material that has both wetting and adhesion properties.

[0031] Example 4:

[0032] (1) 0.03 parts calcium chloride, 0.03 parts hydroxypropyl methylcellulose and 0.04 parts sodium polyacrylate were placed in a ball mill and ground in a certain weight ratio to prepare mixture I. The required rotation speed was 200-300 r / min and the grinding time was 20-30 min. (2) 0.04 parts sodium dodecylbenzenesulfonate and 0.02 parts fatty alcohol polyoxyethylene ether were placed in a magnetic stirrer at a weight ratio and stirred evenly to prepare mixture II. The required stirring speed was 100-200 r / min and the stirring time was 30-50 min. (3) Add mixture I, mixture II and deionized water into the mixer according to the weight ratio, stir at a speed of 60-100 r / min and for a time of 10-20 min to prepare a spray dust suppression material that has both wetting and adhesion properties.

[0033] Example 5:

[0034] (1) 0.03 parts magnesium chloride and calcium chloride (mass ratio 1:1), 0.05 parts hydroxypropyl methylcellulose and 0.05 parts sodium polyacrylate were placed in a ball mill and ground in the specified weight ratio to prepare mixture I. The required rotation speed was 200-300 r / min and the grinding time was 20-30 min. (2) 0.05 parts sodium dodecylbenzenesulfonate and 0.03 parts fatty alcohol polyoxyethylene ether are placed in a magnetic stirrer according to the weight ratio and stirred evenly to prepare mixture II. The required stirring speed is 100-200 r / min and the stirring time is 30-50 min; (3) Add mixture I, mixture II and deionized water into the mixer according to the weight ratio, stir at a speed of 60-100 r / min and for a time of 10-20 min to prepare a spray dust suppression material that has both wetting and adhesion properties.

[0035] Example 6:

[0036] (1) 0.03 parts magnesium chloride and calcium chloride (mass ratio 1:1), 0.05 parts hydroxypropyl methylcellulose and 0.03 parts sodium polyacrylate were placed in a ball mill and ground in the specified weight ratio to prepare mixture I. The required rotation speed was 200-300 r / min and the grinding time was 20-30 min. (2) 0.05 parts sodium dodecylbenzenesulfonate and 0.03 parts fatty alcohol polyoxyethylene ether are placed in a magnetic stirrer according to the weight ratio and stirred evenly to prepare mixture II. The required stirring speed is 100-200 r / min and the stirring time is 30-50 min; (3) Add mixture I, mixture II and deionized water into the mixer according to the weight ratio, stir at a speed of 60-100 r / min and for a time of 10-20 min to prepare a spray dust suppression material that has both wetting and adhesion properties.

[0037] Control group 1: (1) Grind 0.05 parts of hydroxypropyl methylcellulose and 0.05 parts of sodium polyacrylate in a ball mill according to the weight ratio to prepare mixture I. The required rotation speed is 200-300 r / min and the grinding time is 20-30 min; (2) 0.05 parts sodium dodecylbenzenesulfonate and 0.03 parts fatty alcohol polyoxyethylene ether are placed in a magnetic stirrer according to the weight ratio and stirred evenly to prepare mixture II. The required stirring speed is 100-200 r / min and the stirring time is 30-50 min; (3) Add mixture I, mixture II and deionized water into the mixer according to the weight ratio, stir at a speed of 60-100 r / min and for a mixing time of 10-20 min to prepare the spray dust suppression material.

[0038] Control group 2: (1) Place 0.05 parts of sodium dodecylbenzenesulfonate and 0.03 parts of fatty alcohol polyoxyethylene ether into a magnetic stirrer according to the weight ratio and stir evenly to prepare a mixture. The required stirring speed is 100-200 r / min and the stirring time is 30-50 min; (2) Add the mixture and deionized water to the mixer according to the weight ratio, stir at a speed of 60-100 r / min, and mix for 10-20 min to prepare the spray dust suppression material.

[0039]

[0040] As can be seen from the table above, the dust reduction efficiency of Examples 1-6 is improved to a certain extent compared with that of Control Groups 1 and 2, indicating that the spray dust reduction material of this application has a better dust reduction effect. Furthermore, the dust settling time of Examples 1-6 is much shorter than that of Control Groups 1 and 2. The shorter the dust settling time, the higher the dust reduction efficiency is theoretically. In other words, within the same time period, the dust reduction efficiency of Examples 1-6 is much higher than that of Control Groups 1 and 2.

[0041] The dust suppression spray material prepared by this invention has the characteristics of strong adhesion and high water retention, while possessing wetting properties. It effectively captures suspended dust in the mining environment. At the same time, after dust suppression spraying, the moisture in the deposited dust does not easily evaporate, thus achieving effective dust settling.

[0042] The embodiments listed above are not intended to limit the present invention. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. A spray dust suppression material that combines both wetting and adhesion properties, characterized in that, The spray dust suppression material is mainly composed of the following raw materials, in the following weight proportions: Inorganic salts 0.01-0.03 parts 0.03-0.05 parts of anionic surfactant 0.02-0.04 parts of nonionic surfactant Polymer 0.03-0.06 parts Water-retaining agent 0.02-0.05 parts The rest is deionized water.

2. The spray dust suppression material with both wetting and adhesion properties according to claim 1, characterized in that, The spray dust suppression material is mainly composed of the following components, in the following weight proportions: 0.03 parts of inorganic salts 0.05 parts of anionic surfactant 0.03 parts of nonionic surfactant 0.05 parts of polymer 0.04 parts water-retaining agent The rest is deionized water.

3. The spray dust suppression material with both wetting and adhesion properties according to claim 1 or 2, characterized in that, The inorganic salt is selected from one or more of magnesium chloride and calcium chloride; the anionic surfactant is sodium dodecylbenzenesulfonate; the nonionic surfactant is fatty alcohol polyoxyethylene ether; the polymer is hydroxypropyl methylcellulose; and the water-retaining agent is sodium polyacrylate.

4. The spray dust suppression material with both wetting and adhesion properties according to claim 1 or 2, characterized in that, The inorganic salt is selected from magnesium chloride and calcium chloride, and the ratio of magnesium chloride to calcium chloride is 1:

1.

5. A method for preparing a spray dust suppression material with both wetting and adhesion properties as described in any one of claims 1 to 4, characterized in that, Includes the following steps: (1) Inorganic salts, polymers and water-retaining agents are placed in a ball mill according to the weight ratio and ground to prepare mixture I. The required rotation speed is 200-300 r / min and the grinding time is 20-30 min. (2) Anionic surfactant and nonionic surfactant are placed in a magnetic stirrer at a weight ratio and stirred evenly to prepare mixture II. The required stirring speed is 100-200 r / min and the stirring time is 30-50 min. (3) Add mixture I, mixture II and deionized water into the mixer according to the weight ratio, stir at a speed of 60-100 r / min and for a time of 10-20 min to prepare a spray dust suppression material that has both wetting and adhesion properties.

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