WO2022082949A1 - Procédé d'humidification de veine de charbon basé sur le principe bionique des moules - Google Patents

Procédé d'humidification de veine de charbon basé sur le principe bionique des moules Download PDF

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Publication number
WO2022082949A1
WO2022082949A1 PCT/CN2020/134388 CN2020134388W WO2022082949A1 WO 2022082949 A1 WO2022082949 A1 WO 2022082949A1 CN 2020134388 W CN2020134388 W CN 2020134388W WO 2022082949 A1 WO2022082949 A1 WO 2022082949A1
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WO
WIPO (PCT)
Prior art keywords
coal seam
dopamine
coal
polydopamine
polyacrylamide
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PCT/CN2020/134388
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English (en)
Chinese (zh)
Inventor
赵艳云
侯娇云
胡相明
邵志昂
程卫民
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山东科技大学
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Application filed by 山东科技大学 filed Critical 山东科技大学
Publication of WO2022082949A1 publication Critical patent/WO2022082949A1/fr

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
    • E21F5/00—Means or methods for preventing, binding, depositing, or removing dust; Preventing explosions or fires
    • E21F5/02—Means or methods for preventing, binding, depositing, or removing dust; Preventing explosions or fires by wetting or spraying
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
    • E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
    • E21F5/00—Means or methods for preventing, binding, depositing, or removing dust; Preventing explosions or fires
    • E21F5/16—Layers of hygroscopic or other salts deposited on floors, walls, or the like, for binding dust; Deposition of such layers

Definitions

  • the invention relates to the technical field of coal mine dust prevention, in particular to a coal seam moisturizing method based on the mussel bionic principle.
  • coal seam water injection is an important means to reduce mine dust production, and it is also the only way to actively reduce dust production. measures.
  • Coal seam water injection is the process of injecting liquid into the coal seam in front of the working face under a certain pressure. The liquid is injected into the coal seam along the cleats and cracks, and penetrates a considerable distance from the borehole in the radial direction, which can effectively achieve the effect of wetting and dust reduction. .
  • the water injection wetting effect of coal seam has been to be improved.
  • the purpose of the present invention is to provide a coal seam moisturizing method based on the mussel bionic principle.
  • the water injection wetting agent can be injected into the coal body before the coal mining, so that the surface of the coal can be hydrophilized and modified,
  • the coal surface is converted from hydrophobicity to hydrophilicity, which improves the water injection and wetting effect of the coal seam, thereby reducing the generation of coal dust.
  • coal seam water-injection wetting agent A kind of coal seam moisturizing method based on mussel biomimetic principle, the coal seam water-injection wetting agent it adopts is composed of the following raw materials:
  • Dopamine is used for oxidative self-polymerization to generate polydopamine under weak alkaline conditions, and the concentration of the dopamine is 1-3 mg/mL;
  • Polyacrylamide which is used for the secondary modification of hydrophilicity to the formed polydopamine, and the molar ratio of the polyacrylamide to the dopamine is 0.5 to 4:1;
  • Copper sulfate used to improve the speed of the oxidation and self-polymerization of dopamine to generate polydopamine; the concentration of the copper sulfate is 4 ⁇ 8mmol/L;
  • Hydrogen peroxide in conjunction with the copper sulfate, is used to improve the speed of the dopamine oxidation and self-polymerization to generate polydopamine; the concentration of the hydrogen peroxide is 19.6-29.4 mmol/L;
  • Sodium hydroxide which provides an alkaline environment for the solution, so that the pH of the solution is 8.5 to 11;
  • the described coal seam moisturizing method comprises the following steps:
  • the coal seam water injection wetting agent is injected into the corresponding coal seam to change the hydrophobicity of the corresponding coal seam.
  • the molar ratio of the polyacrylamide to the dopamine is 1:1.
  • the copper sulfate is copper sulfate pentahydrate, and the mass fraction of the hydrogen peroxide is 30%.
  • the preparation method of the above-mentioned coal seam water injection wetting agent comprises the following steps in turn:
  • step S2 constant temperature stirring is performed at a temperature of 55° C. for 1 hour until the polyacrylamide is completely dissolved.
  • the raw materials used in the present invention are dopamine, polyacrylamide, copper sulfate, hydrogen peroxide, sodium hydroxide and water.
  • dopamine and polyacrylamide are used as the main raw materials
  • dopamine is a neurotransmitter endocrine in the brain of organisms. It can undergo oxidative self-polymerization under weak alkaline conditions to generate polydopamine.
  • the molecular structure of this type of polymer contains functional groups such as catechol and primary amines, which have strong adhesion and good hydrophilicity, and can be easily deposited on on almost all types of inorganic and organic substrates, including superhydrophobic surfaces.
  • the reaction process is simple and the conditions are mild, and the formed polydopamine coating has controllable film thickness and long-lasting stability, and has been widely used as a modified material in various fields. Since polydopamine molecules have rich physical and chemical properties, they can be modified by physical effects (such as hydrogen bonds, etc.) and chemical reactions (such as Michael addition reaction, etc.)
  • the strong polyacrylamide performs hydrophilic secondary modification on the polydopamine coating, so that the coal modified by the coal seam water injection wetting agent has good wettability.
  • the addition of copper sulfate and hydrogen peroxide is to improve the oxidative self-polymerization of dopamine and the deposition rate of polydopamine-polyacrylamide coating on the coal surface.
  • the present invention takes the hydrophobicity of coal as the starting point, and performs hydrophilic modification on it, so as to improve the water injection and wetting effect of coal seam .
  • coal seam water-injection wetting agent is injected into the coal seam by means of water-injection, so as to make the coal hydrophilic and modified. Good wettability has been maintained during transportation and use to reduce coal dust production from start to finish.
  • the wetting agent for coal seam water injection prepared by using hydrophilic modified material polydopamine and superabsorbent resin polyacrylamide has good hydrophilicity.
  • Fig. 1 is the mechanism diagram of the deposition of polydopamine-polyacrylamide coating on the coal surface according to the embodiment of the present invention
  • FIG. 2 is a schematic diagram of a contact angle of an embodiment of the present invention.
  • Fig. 3 is the variation situation of contact angle with time when the embodiment of the present invention changes the concentration of dopamine
  • Fig. 5 is the variation of the contact angle with time when the molar ratio of polyacrylamide and dopamine added is changed in the embodiment of the present invention.
  • the present invention proposes a coal seam moisturizing method based on the mussel bionic principle.
  • the present invention is described in detail below with reference to specific embodiments.
  • the briquettes were compressed with a 769YP-24B tablet press produced by Shanghai Xinnuo Instrument Co., Ltd. 550 mg of pulverized coal was weighed and added to the mold. Put the mold loaded with pulverized coal under the pressurizing machine, pressurize it to 20MPa, and take out the coal cake after maintaining the pressure for 2min. A certain number of briquettes with a diameter of about 1 cm and a thickness of about 5 mm are pressed.
  • Contact angle is an important parameter to evaluate the wettability of liquid on solid. It refers to the angle ⁇ between the tangent of the gas-liquid interface made at the intersection of the gas-liquid-solid three-phase and the solid-liquid interface on the side where the liquid is located, as shown in Figure 2. Show.
  • the contact angle of the liquid on the coal surface is an important parameter to measure the wettability of the coal surface. The better the wetting effect, the smaller the contact angle, and the easier the solution is to diffuse on the solid surface. It is generally believed that when ⁇ ⁇ 90°, the solid surface is hydrophilic, and the liquid is more likely to wet the solid, and the smaller the ⁇ value, the better the wettability.
  • mM refers to millimoles per liter.
  • Figure 1 shows the reaction mechanism of the present invention, in which polydopamine is mainly generated by oxidative self-polymerization of dopamine under weak alkaline conditions, and then the polydopamine coating is subjected to hydrophilic secondary modification by polyacrylamide, so that the polydopamine coating is hydrophilic.
  • the coal modified by the water injection wetting agent in the coal seam has good wettability.
  • the contact angle of the coal sample is significantly reduced after the deposition and modification of the coal seam water injection wetting agent.
  • the contact angle of the coal sample surface is about 35° at 10s, and when the deposition time increases to 30min, the contact angle decreased significantly.
  • the deposition time continued to increase to 45min and 60min the contact angle changed little, and the change rate of the contact angle with time was similar under the four deposition time conditions. Therefore, considering the convenience in practical application, the optimal deposition time is 30 min.
  • this method of coal seam water injection wetting agent modification can significantly reduce the contact angle of the coal surface, that is, improve the wettability of the coal surface, and the optimized modification conditions can be obtained as follows:
  • the dopamine concentration was 2 mg/mL
  • the deposition time was 30 min
  • the molar ratio of polyacrylamide to dopamine was 1:1.

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Solid Fuels And Fuel-Associated Substances (AREA)

Abstract

Un procédé d'humidification de veine de charbon basé sur le principe bionique des moules se rapporte au domaine technique de la prévention de la poussière de mine de charbon. La composition de matière première d'un agent mouillant par injection d'eau dans une veine de charbon utilisée dans le procédé comprend : la dopamine, qui est utilisée pour produire de la polydopamine par auto-polymérisation oxydative dans une condition faiblement alcaline ; le polyacrylamide, qui est utilisé pour effectuer une modification secondaire hydrophile sur la polydopamine formée ; le sulfate de cuivre, qui est utilisé pour augmenter la vitesse à laquelle la polydopamine est produite par l'auto-polymérisation oxydative de la dopamine ; le peroxyde d'hydrogène, qui coopère avec le sulfate de cuivre et est utilisé pour augmenter la vitesse à laquelle la polydopamine est produite par l'auto-polymérisation oxydative de la dopamine ; l'hydroxyde de sodium, qui génère un environnement alcalin pour la solution, de sorte que la valeur de pH de la solution est comprise entre 8,5 et 11 ; et de l'eau, l'eau étant utilisée en tant que solvant. La dopamine passe par l'auto-polymérisation oxydative pour devenir la polydopamine, et la polydopamine et le polyacrylamide sont soumis à une addition de Michael et sont réticulés l'un à l'autre. Après injection de l'agent mouillant par injection d'eau dans une veine de charbon, le caractère hydrophile de la surface du charbon peut être considérablement amélioré.
PCT/CN2020/134388 2020-10-23 2020-12-08 Procédé d'humidification de veine de charbon basé sur le principe bionique des moules WO2022082949A1 (fr)

Applications Claiming Priority (2)

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CN202011142758.0 2020-10-23
CN202011142758.0A CN112412523A (zh) 2020-10-23 2020-10-23 基于贻贝仿生原理的煤层增润方法

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CN114106774A (zh) * 2021-12-02 2022-03-01 滨州学院 一种煤层注水用强渗增润型材料制备及应用
CN114738039B (zh) * 2022-04-19 2023-06-23 常州大学 一种聚多巴胺包覆混合粉体改性抑爆材料的制备方法
CN116675376B (zh) * 2023-06-15 2024-03-12 艾培克环保科技(上海)有限公司 一种丙烯酸丁酯废水的处理设备
CN116835790B (zh) * 2023-06-15 2024-03-08 艾培克环保科技(上海)有限公司 一种丙烯酸丁酯废水的处理工艺

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CN102337103A (zh) * 2011-07-11 2012-02-01 山东科技大学 一种煤层注水用渗透剂
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