A kind of aerosol gel material with dual precise plugging functions and its preparation method

Abstract

The present invention relates to the technical field of coal mine safety materials, and specifically relates to an aerosol gel material with a dual precise plugging function and a preparation method thereof. The aerosol gel material comprises component A and component B; wherein, component A includes an organic small molecule monomer with a crosslinking film-forming function, a substance containing phenolic hydroxyl groups, an initiator, a surfactant and water, and component B includes a crosslinking agent, an initiator, a surfactant and water. Components A and B are transported through different pipelines to different nozzles of a spraying device and sprayed out. The atomized components A and B use air leakage as a carrier and enter the pores of coal along with the air flow, and react in the pores to form an aerosol gel material, plugging the pores of the coal, reducing the contact between the active groups in the coal and oxygen, and then gradually depositing and forming a film in the goaf and its air leakage channels to plug the air leakage channels, forming dual plugging; the aerosol gel material can reduce the molecular weight by controlling the degree of polymerization of component A to achieve atomization.

Description

Technical Field

[0001] The present invention relates to the technical field of coal mine safety materials, and particularly relates to an aerosol gel material with a dual precise plugging function and a preparation method thereof Background Technique

[0002] The spontaneous combustion of coal seriously threatens the safe production of coal mines. Plugging air leakage is a key technology for preventing the spontaneous combustion of coal. The prevention and control technologies for plugging air leakage in goaf mainly include grouting (gel), injecting foam, and spraying inhibitor aerosol, etc. Although the grouting technology has a low cost, it is easy to produce the phenomenon of "gulleying", and it cannot cover the goaf in a large range and is difficult to stack upwards. Foam materials are considered to be the most suitable technology for preventing and controlling coal spontaneous combustion in goaf due to their wide diffusion range, good stacking property, and the ability to cover the coal left in the high places. However, traditional water-based foams, three-phase foams and other fire-fighting and extinguishing materials are easy to break, and the long-term oxygen isolation effect is not good. In addition, it is difficult for the above prevention and control technologies to achieve precise plugging. Although spraying inhibitor aerosol will enter the goaf along the air leakage channel and form a liquid film in the air leakage channel and goaf to prevent the entry of air, the action time of the liquid film is short and it is greatly affected by the mine pressure. Therefore, the above technologies cannot meet the requirements of precise plugging to prevent coal spontaneous combustion Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide an aerosol gel material with a dual precise plugging function and a preparation method thereof, and a preparation method is provided to solve at least one of the technical problems in the background technique. The adopted technical solution is as follows

[0004] An aerosol gel material with a dual precise plugging function includes component A and component B; wherein, component A includes an organic small molecule monomer with a cross-linking film-forming function, a substance containing phenolic hydroxyl groups, an initiator, a surfactant and water, and component B includes a cross-linking agent, an initiator, a surfactant and water; component A and component B are transported through different pipelines to different nozzles of the spraying device and sprayed out. The atomized component A and component B take the air leakage as a carrier and enter the pores of the coal along with the air flow, and react in the pores to form an aerosol gel material, plugging the pores of the coal, reducing the contact between the active groups in the coal and oxygen, and then gradually depositing and forming a film in the goaf and its air leakage channels to plug the air leakage channels, forming dual plugging; the aerosol gel material can reduce the molecular weight by controlling the degree of polymerization of component A to achieve atomization

[0005] Preferably, the mass parts of the raw materials in each component are: 7-9 parts of the organic small molecule monomer in component A, 0.5-1.0 part of the substance containing phenolic hydroxyl groups, 0.5-1 part of the initiator, 0.5-1 part of the surfactant, and 5-10 parts of water; 0.5-1 part of the cross-linking agent in component B, 0.1-0.5 part of the initiator, 0.5-1 part of the surfactant, and 100 parts of water

[0006] Preferably, the organic small molecule monomer with cross-linking film-forming function in component A is one or a mixture of more than one of acrylic acid, polyvinyl alcohol, sodium alginate and their composite materials; the substance containing phenolic hydroxyl group is mono-, di-phenolic hydroxyl group and polyphenolic hydroxyl group substances; the initiator is a peroxide, and is one or a mixture of two of ammonium persulfate and sodium persulfate; the surfactant is OP-10.

[0007] Preferably, the organic small molecule monomer with cross-linking film-forming function is acrylic acid; the substance containing phenolic hydroxyl group is catechol.

[0008] Preferably, the cross-linking agent in component B is sodium carboxymethyl cellulose or polysaccharide, the initiator is one or a mixture of two of ammonium persulfate and sodium persulfate, and the surfactant is sodium dodecylbenzenesulfonate or OP-10 and a combination of both.

[0009] The preparation method of a kind of aerosol gel material with double-precision plugging function described in any one of the above, the specific steps are as follows:

[0010] (1) First, take a certain amount of organic small molecule monomer material and surfactant and add them into water, stir at room temperature to make them fully mixed, then drop the initiator into the above solution and continue to stir for 10 - 30 min, and finally drop the phenolic hydroxyl group substance and stir for 10 min to finally form component A;

[0011] (2) Add the cross-linking agent, initiator and surfactant into water, and slowly stir for 10 min to obtain component B;

[0012] (3) After components A and B are prepared, use a spraying device to transport components A and B to different nozzles of the spraying device through different pipelines and spray them out respectively, and use the leaking air flow to transport the aerosol to the gob area;

[0013] (4) After spraying, in the gob area, the atomized components A and B first enter the pores of the coal with the air flow, and components A and B react in the pores to form an aerosol gel material to block the pores of the coal, reducing the contact between the active groups in the coal and oxygen, and then components A and B gradually deposit and form a film in the gob area and its air leakage channels to block the air leakage channels, forming double-layer plugging.

[0014] Preferably, in step (1), the polymerization degree of the organic small molecule monomer can be controlled by the addition amount of the initiator, the stirring time and the addition amount of the polyphenolic hydroxyl group in component A. The molecular weight of the polymerized component A is less than 1500 and can enter the pores of the coal.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] Aiming at the problem of air leakage prevention and control in goafs, the present invention provides a material for preventing and controlling air leakage in goafs and its preparation method. By utilizing the characteristics of air flow migrating along the air leakage channels, the atomizable material of the invention is transported into the goaf. First, it enters the pores of coal with the air flow, blocks the pores of coal to reduce the contact between the active groups in coal and oxygen, and then gradually deposits into a film in the goaf and its air leakage channels to block the air leakage channels, forming a double-layer air leakage prevention, thus achieving the purpose of accurate and efficient air leakage prevention.

[0017] The present invention proposes a technology for collaborative control of atomization, which solves the problems that existing film-forming materials have large molecular weights and are difficult to atomize, and lack atomization technology. It realizes the atomizability of the gel and its ability to enter the pores of coal. At the same time, the material also has good adhesiveness, flexibility and film-forming characteristics.

[0018] Using this method and material for air leakage prevention avoids the inconvenience of multiple plugging with traditional materials, improves the accuracy of plugging, and the material also contains groups that inhibit coal spontaneous combustion, thus achieving the dual purposes of air leakage prevention and coal spontaneous combustion prevention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the technological process for preparing the material of the present invention;

[0020] Figure 2 It is a graph of the experimental results of the control factors affecting the molecular weight of the material of the present invention; among them, the small graph a is the relationship curve between the molecular weight of component A and the addition amount of initiator, the small graph b is the relationship curve between the molecular weight of component A and the stirring time, and the small graph c is the relationship curve between the molecular weight of component A and the addition amount of phenols;

[0021] Figure 3 It is a graph of the film formed after the material prepared by the present invention is ejected. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The drawings are only for illustrative purposes; it should be understood that the examples mentioned below are only used to explain the present invention, for the convenience of describing the present invention and simplifying the description, and therefore, should not be construed as a limitation to the present invention.

[0023] The principles and features of the present invention are described below in conjunction with embodiments. The embodiments cited are only used to explain the present invention and are not used to limit the scope of the present invention. For those conditions not specified in the embodiments, they are carried out according to the conventional conditions or the conditions recommended by the manufacturer. For the reagents or instruments whose manufacturers are not specified, they are all conventional products that can be obtained through commercial purchase.

[0024] The present invention will be further described below in conjunction with embodiments and drawings.

[0025] Example 1

[0026] A kind of aerosol gel material with dual precise plugging function, including component A and component B; among them, component A includes organic small molecule monomers with crosslinking film-forming function, substances containing phenolic hydroxyl groups, initiators, surfactants and water, and component B includes crosslinking agents, initiators, surfactants and water.

[0027] As Figure 1 shown, a preparation method of an aerosol gel material with dual precise plugging function is prepared by the following steps:

[0028] (1) Preparation of component A: Weigh 5 parts of deionized water at room temperature and add it to a three-necked flask, then weigh 7 parts of organic small molecule monomers (acrylic acid) and 0.5 part of surfactant and add them to the three-necked flask, and stir evenly at room temperature. Add 0.5, 0.8 and 1.0 parts of ammonium persulfate respectively and continue to stir for 10 minutes. Finally, add 0.8 part of catechol and continue to stir for 10 minutes to obtain component A;

[0029] (2) Preparation of component B: Add 100 parts of deionized water to a beaker, add 0.5 part of sodium carboxymethyl cellulose or polysaccharide, 0.1 part of ammonium persulfate, and 0.5 part of surfactant to the water and stir and mix to obtain component B;

[0030] (3) After the preparation of component A and component B is completed, use a spraying device to transport component A and component B to different nozzles of the spraying device through different pipelines and spray them out respectively, and use the leaking air flow to transport the aerosol to the goaf;

[0031] (4) After spraying, in the goaf, the atomized component A and component B first enter the pores of the coal with the air flow, and in the pores, component A reacts with component B to form an aerosol gel material with dual precise plugging function, blocking the pores of the coal and reducing the contact between the active groups in the coal and oxygen. Then, in the goaf and its air leakage channels, component A reacts with component B and gradually deposits into a film to block the air leakage channels, forming a double-layer plugging.

[0032] Figure 2 In the small figure a of

[0033] By adjusting the addition amount of the initiator, the molecular weight of the polymerized component A is between 850 - 1500. The present invention can also adjust the size of the particles after the material is atomized within the range of 0.5 - 20.0 μm by adding different amounts of component B.

[0034] Example 2

[0035] A kind of aerosol gel material with dual precise plugging function, comprising component A and component B; wherein, component A includes organic small molecule monomers with crosslinking film-forming function, substances containing phenolic hydroxyl groups, initiators, surfactants and water, and component B includes crosslinking agents, initiators, surfactants and water.

[0036] As Figure 1 shown, a preparation method of an aerosol gel material with dual precise plugging function is obtained by the following steps:

[0037] (1) Preparation of component A: Weigh 8 parts of deionized water and add it to a three-necked flask at room temperature. Then weigh 8 parts of organic small molecule monomers (acrylic acid) and 0.2 parts of surfactant and add them to the three-necked flask, and stir evenly at room temperature. Then add 0.8 parts of ammonium persulfate, and stir for 10, 20 and 30 minutes respectively. Finally, add 0.8 parts of catechol and continue to stir for 10 minutes to obtain component A;

[0038] (2) Preparation of component B: Add 100 parts of deionized water to a beaker, and add 0.5 parts of sodium carboxymethyl cellulose or polysaccharide, 0.3 parts of ammonium persulfate, and 0.5 parts of surfactant to the water and stir and mix to obtain component B;

[0039] (3) After the preparation of components A and B is completed, use a spraying device to separately transport components A and B to different nozzles of the spraying device through different pipelines and spray them out, and use the leaking air flow to transport the aerosol to the gob area;

[0040] (4) After spraying, in the gob area, the atomized components A and B first enter the pores of the coal with the air flow, and in the pores, component A reacts with component B to form an aerosol gel material with dual precise plugging function, plugging the pores of the coal and reducing the contact between the active groups in the coal and oxygen. Then, in the gob area and its air leakage channels, component A reacts with component B and gradually deposits into a film to plug the air leakage channels, forming a double-layer plugging.

[0041] Figure 2 In the small figure b of [[ ]], by adjusting the stirring time, the molecular weight of the polymerized component A is between 850 and 1400. The present invention can also adjust the size of the particles after the material is atomized within 0.5 - 20.0 μm by adding different amounts of component B.

[0042] Other places not mentioned are the same as in Example 1.

[0043] Example 3

[0044] A kind of aerosol gel material with dual precise plugging function, comprising component A and component B; wherein, component A includes organic small molecule monomers with cross-linking film-forming function, substances containing phenolic hydroxyl groups, initiators, surfactants and water, and component B includes cross-linking agents, initiators, surfactants and water.

[0045] As Figure 1 shown, a preparation method of an aerosol gel material with dual precise plugging function is prepared by the following steps:

[0046] (1) Preparation of component A: Weigh 10 parts of deionized water at room temperature and add it to a three-necked flask, then weigh 9 parts of organic small molecule monomers (acrylic acid) and 0.5 part of surfactant and add them to the three-necked flask, and stir evenly at room temperature. Then add 1.0 part of ammonium persulfate and continue to stir for 10 min. Finally, add 0.5, 0.8, and 1.0 parts of catechol respectively and continue to stir for 10 min to obtain component A;

[0047] (2) Preparation of component B: Add 100 parts of deionized water to a beaker, add 0.5 part of sodium carboxymethyl cellulose or polysaccharide, 0.5 part of ammonium persulfate, and 0.5 part of surfactant to the water and stir and mix to obtain component B;

[0048] (3) After the preparation of components A and B is completed, use a spraying device to transport components A and B to different nozzles of the spraying device through different pipelines and spray them out respectively, and use the leaking air flow to transport the aerosol to the gob area;

[0049] (4) After spraying, in the gob area, the atomized components A and B first enter the pores of the coal with the air flow, and in the pores, component A reacts with component B to form an aerosol gel material with dual precise plugging function to block the pores of the coal, reducing the contact between the active groups in the coal and oxygen. Then, in the gob area and its air leakage channels, component A reacts with component B and gradually deposits into a film to block the air leakage channels, forming a double-layer plugging.

[0050] Figure 2 In the small figure c of , by adjusting the addition amount of catechol, the molecular weight of the polymerized component A is between 800 - 1400. The present invention can also adjust the particle size of the material after atomization within 0.5 - 20.0 μm by adding different amounts of component B.

[0051] Other places not mentioned are the same as in Example 1.

[0052] The OP-10 used in the present invention is emulsifier OP-10, a kind of surfactant.

[0053] Certainly, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Other changes, modifications, additions or substitutions made by those skilled in the art within the substantial scope of the present invention shall also fall within the protection scope of the present invention.

Claims

1. A kind of aerosol gel material with dual precise leakage plugging function, characterized in that, it includes component A and component B; among them, component A includes organic small molecule monomers with cross-linking and film-forming functions, substances containing phenolic hydroxyl groups, initiators, surfactants and water, and component B includes cross-linking agents, initiators, surfactants and water; Component A and component B are transported to different nozzles of the spraying device through different pipelines and sprayed out. The atomized component A and component B use the air leakage as a carrier and enter the pores of the coal along with the air flow, and react in the pores to form an aerosol gel material, plugging the pores of the coal, reducing the contact between the active groups in the coal and oxygen, and then gradually depositing and forming a film in the goaf and its air leakage channels to plug the air leakage channels, forming dual leakage plugging; the aerosol gel material can reduce the molecular weight by controlling the degree of polymerization of component A to achieve atomization.

2. A kind of aerosol gel material with dual precise leakage plugging function according to claim 1, characterized in that, the mass parts of the raw materials in each component are: 7-9 parts of organic small molecule monomers in component A, 0.5-1.0 part of substances containing phenolic hydroxyl groups, 0.5-1 part of initiators, 0.5-1 part of surfactants, and 5-10 parts of water; 0.5-1 part of cross-linking agent, 0.1-0.5 part of initiator, 0.5-1 part of surfactant, and 100 parts of water in component B.

3. A kind of aerosol gel material with dual precise leakage plugging function according to claim 1, characterized in that, the organic small molecule monomers with cross-linking and film-forming functions in component A are one or a mixture of more than one of acrylic acid, polyvinyl alcohol, sodium alginate and their compound materials; the substances containing phenolic hydroxyl groups are mono-, di-phenolic hydroxyl and polyphenolic hydroxyl substances; the initiator is a peroxide, and it is one or a mixture of two of ammonium persulfate and sodium persulfate; the surfactant is OP-10.

4. A kind of aerosol gel material with dual precise leakage plugging function according to claim 1, characterized in that, the cross-linking agent in component B is sodium carboxymethyl cellulose or polysaccharide, the initiator is one or a mixture of two of ammonium persulfate and sodium persulfate, and the surfactant is sodium dodecylbenzenesulfonate or OP-10 or a combination of both.

5. A preparation method of a kind of aerosol gel material with dual precise leakage plugging function according to any one of claims 1-4, characterized in that, the specific steps are as follows: (1) First, take a certain amount of organic small molecule monomer materials and surfactants and add them to water, stir at room temperature to make them fully mixed, then drop the initiator into the above solution and continue to stir for 10-30 min, and finally drop the phenolic hydroxyl substance and stir for 10 min to finally form component A; (2) Add the cross-linking agent, initiator and surfactant to water, and slowly stir for 10 min to obtain component B; (3) After the preparation of component A and component B is completed, use a spraying device to transport component A and component B to different nozzles of the spraying device through different pipelines and spray them out respectively, and use the air leakage air flow to transport the aerosol to the goaf; After spraying, in the gob area, the atomized components A and B first enter the pores of the coal with the air flow, and components A and B react in the pores to form a vapor mist gel material to block the pores of the coal, reducing the contact between the active groups in the coal and oxygen. Then, components A and B gradually deposit into a film in the gob area and its air leakage channels to block the air leakage channels, forming a double-layer leakage plugging.

6. The preparation method of a vapor mist gel material with a dual precise leakage plugging function according to claim 5, characterized in that in the step (1), the degree of polymerization of the organic small molecule monomer can be controlled by the addition amount of the initiator, the stirring time, and the addition amount of the polyphenol hydroxyl group in component A. The molecular weight of the polymerized component A is less than 1500 and can enter the pores of the coal.

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