Flexible foldable gel carrier with shape memory function and application thereof

Abstract

The invention provides a flexible foldable gel carrier with a shape memory function and application thereof.The flexible foldable gel carrier comprises a flexible carrier body, the flexible carrier body is of a layered structure, the flexible carrier body is prepared from a composite material, the composite material is prepared from glass fiber reinforced plastic and polyurethane SMP, and the shape memory function is achieved through the composite material. The interior of the layered structure is divided into a plurality of cavities, drainage holes are formed between the adjacent cavities, and glue injection openings are evenly formed in the top end of the flexible carrier body. The flexible carrier body is made of the glass fiber reinforced plastic and the polyurethane SMP and can be folded and compressed so that the flexible carrier body can be placed in a narrow goaf, the flexible carrier body can be restored in a relatively high-temperature environment of the goaf under the action of the polyurethane SMP, and a stable wall can be formed after gel is injected and solidified, so that the goaf can be well protected, and the service life of the goaf is prolonged. Separation, sealing and isolation of the goaf can be effectively achieved, heat can be effectively absorbed, and coal spontaneous combustion is prevented.

Description

Technical Field

[0001] The invention belongs to the technical field of mine anti-oxidation fire prevention and gas isolation, and particularly relates to a flexible and foldable gel carrier with shape memory function and application thereof. Background Art

[0002] Coal plays a pivotal role in my country's economic development, and coal spontaneous combustion is one of the main disasters that restrict the safe and efficient mining of coal resources. The occurrence of coal spontaneous combustion requires four conditions: coal with a tendency to spontaneous combustion, a good heat storage environment, sufficient oxygen supply conditions, and a certain oxidation time. Air leakage from the working face to the goaf is one of the main sources of oxygen for the oxidation of coal in the goaf. Controlling air leakage from the working face and the two lanes to the goaf is one of the difficulties in preventing and controlling coal spontaneous combustion in the goaf.

[0003] Traditional plugging technology often requires a large amount of grouting materials, a huge amount of construction work, and lacks flexibility and is difficult to adapt to complex underground environments. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a flexible and foldable gel carrier with shape memory function and its application in view of the shortcomings of the above-mentioned prior art, aiming to solve the problems of material waste, structural instability, difficulty in entering narrow spaces, etc. existing in the existing goaf plugging technology.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: a flexible foldable gel carrier with shape memory function, characterized in that it includes a flexible carrier body, the flexible carrier body is a layered structure, the flexible carrier body is made of a composite material, the composite material is made of glass fiber reinforced plastic and polyurethane SMP, the layered structure is divided into a plurality of cavities by criss-cross drainage baffles, the drainage baffles are inclined, the drainage baffles are more dispersed at the center of the flexible carrier body, which is convenient for gel diffusion, and the drainage baffles are more dense at the edge of the flexible carrier body, which improves the stability of the edge of the flexible carrier body. Each layer of the flexible carrier body is pressed and formed by the composite material in the mold to press out the cavity, and then the pressed composite material is stacked together and adhered to form a flexible carrier body. Drainage holes are provided between adjacent cavities, and the cavities and the drainage holes form drainage channels to facilitate the gel to flow in the flexible carrier body and fill the cavities in the flexible carrier body so as to form a stable supporting structure. Glue injection ports are evenly arranged on the top of the flexible carrier body, and the inner diameter of the glue injection ports is 2 to 5 cm. The glue injection pipe is connected through the glue injection ports to inject gel into the flexible carrier body. A plurality of exhaust holes are also provided on the top of the flexible carrier body to discharge the air in the cavity. A plurality of overflow holes are evenly provided on the outer wall of the flexible carrier body, and the gel can be moved out from the overflow holes and filled between the flexible carrier body and the goaf. After the gel is solidified, the flexible carrier body can be firmly connected to the goaf, so that the flexible carrier body can be firmly installed in the goaf.

[0006] Preferably, the raw material of the flexible carrier body is prepared by the following steps:

[0007] A1. Use the prepreg process to pre-impregnate the glass fiber in epoxy resin to form a prepreg.

[0008] A2. Lay multiple layers of prepreg together, embed the polyurethane SMP into the multiple layers of prepreg, and use lamination technology to evenly distribute the polyurethane SMP in the prepreg to obtain a chimera.

[0009] A3. The chimera is treated by a high temperature curing process to completely cure the glass fiber and epoxy resin to obtain a flexible material.

[0010] A4. Perform surface coating treatment on the flexible material to obtain a composite material.

[0011] Preferably, the glass fiber is E glass fiber, the diameter of the glass fiber is 10-15 μm, and the glass transition temperature of the polyurethane SMP is 35° C.

[0012] An application of a flexible foldable gel carrier with shape memory function comprises the following steps:

[0013] S1. In an environment where the temperature is between -20 and -10°C, fold the flexible carrier body into an S shape and then compress it. Then, place the compressed flexible carrier body in a flexible tray, and place the flexible tray in the thruster so that the front end of the thruster is aligned with the goaf.

[0014] S2, the flexible tray is pushed toward the front end of the thruster by a hydraulic device, so that the flexible carrier body and the flexible tray are further compressed and squeezed out from the front end of the thruster into the goaf.

[0015] S3, after the flexible carrier body and the flexible tray enter the goaf, since the temperature in the goaf is above 35°C, the polyurethane SMP is activated, driving the flexible carrier body to unfold, and the flexible carrier body stretches the flexible tray and fully stretches in the goaf. After the flexible carrier body is fully stretched, it solidifies under the action of the temperature in the goaf.

[0016] S4, insert the glue injection tube into the goaf, connect the glue injection tube with the glue injection port, and start to inject gel into the flexible carrier body under pressure. The gel fills the cavity in the flexible carrier body along the drainage hole and overflows from the overflow hole to fill the gap between the goaf and the flexible carrier body. The air in the flexible carrier body is discharged from the exhaust hole at the top. After the gel fills the flexible carrier body, disconnect the glue injection tube and the glue injection port.

[0017] S5, after 15-30 minutes, the gel solidifies, so that the flexible carrier body forms a stable supporting structure, and the flexible carrier body is firmly bonded to the goaf to form a stable isolation wall.

[0018] Preferably, the thruster is coated with a heat-insulating material so that the flexible carrier body and the flexible tray can stably maintain a folded and compressed state in the thruster. A push piston is fixedly connected to the output end of the hydraulic device, and the size of the push piston matches the inner diameter of the thruster.

[0019] Preferably, the flexible tray is made of the same material as the flexible carrier body, and the flexible tray is cylindrical in shape. The flexible tray fits the folded flexible carrier body, and after entering the goaf and being heated, the flexible tray is also unfolded and reset to release the flexible carrier body.

[0020] Compared with the prior art, the present invention has the following advantages:

[0021] 1. The flexible carrier body of the present invention is made of glass fiber reinforced plastic and polyurethane SMP, can be customized according to actual application requirements, can be suitable for goafs of different shapes, can be folded and compressed, so that the flexible carrier body can be placed in a narrow goaf, can be restored under the action of polyurethane SMP in a relatively high temperature environment of the goaf, and can form a stable wall after the gel is injected and solidified, which can effectively separate, seal and isolate the goaf, and can also effectively absorb heat to prevent spontaneous combustion of coal.

[0022] 2. In the present invention, the flexible carrier body is divided into multiple layers of cavities, and drainage partitions are provided in the cavities to divide them into multiple drainage channels. Adjacent cavities are connected through drainage holes on the partitions, and adjacent drainage channels are connected through drainage holes on the drainage partitions, so that the gel can fill all drainage channels from the injection port. Overflow holes are provided on the outer wall of the flexible carrier body to allow the gel to overflow and fill the gaps in the goaf, so that the flexible carrier body and the goaf are bonded. After the gel is solidified, the flexible carrier body and the goaf are combined into a tight whole, and the flexible carrier body can form a stable isolation wall.

[0023] 3. Compared with the reinforced concrete structure or large amount of grouting in the traditional goaf treatment method, the present invention uses a foldable flexible carrier body combined with gel injection, which can significantly reduce the use of raw materials and reduce costs. At the same time, the flexible carrier body can be customized according to actual needs, avoiding the phenomenon of excessive use of materials.

[0024] The present invention is further described in detail below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the cross-sectional structure of the flexible carrier body in the present invention.

[0026] Figure 2 It is a schematic diagram of the cross-sectional structure of the flexible carrier body in the present invention from another viewing angle.

[0027] Figure 3 It is a structural schematic diagram of the propeller in the present invention.

[0028] Description of reference numerals:

[0029] 1—flexible carrier body; 2—drainage baffle; 3—drainage hole;

[0030] 4—drainage channel; 5—glue injection port; 6—exhaust hole;

[0031] 7—overflow hole; 8—flexible tray; 9—thruster;

[0032] 10—Hydraulic device. DETAILED DESCRIPTION

[0033] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific implementation disclosed below.

[0034] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0035] like Figures 1 to 3 As shown, the present invention provides a flexible foldable gel carrier with shape memory function, including a flexible carrier body 1, the flexible carrier body 1 is a layered structure, the flexible carrier body 1 is made of a composite material, the composite material is made of glass fiber reinforced plastic and polyurethane SMP, the layered structure is divided into a plurality of cavities by crisscross drainage baffles 2, the drainage baffles 2 are inclined, the cavity shape is a quadrangular pyramid or an inverted quadrangular pyramid, the drainage baffles 2 are relatively dispersed at the center of the flexible carrier body 1, which is convenient for gel diffusion, and the drainage baffles 2 are relatively dense at the edge of the flexible carrier body 1, which improves the stability of the edge of the flexible carrier body 1. Each layer of the flexible carrier body 1 is pressed and formed by the composite material in the mold to press out the cavity, and then the pressed composite materials are stacked together and bonded to form the flexible carrier body 1.

[0036] Drainage holes 3 are provided between adjacent cavities, and the cavities and drainage holes 3 form drainage channels 4, which facilitate the gel to flow in the flexible carrier body 1 and fill the cavities in the flexible carrier body 1, so as to form a stable support structure. The top of the flexible carrier body 1 is evenly provided with glue injection ports 5, and the inner diameter of the glue injection ports 5 is 2 to 5 cm. The glue injection pipe is connected through the glue injection ports 5 to inject gel into the flexible carrier body 1. The glue injection port 5 can also be set at the side end of the flexible carrier body 1 to inject glue from the side.

[0037] The flexible carrier body 1 is also provided with a plurality of exhaust holes 6 at the top to discharge the air in the cavity. The flexible carrier body 1 is evenly provided with a plurality of overflow holes 7 on the outer wall. The gel can be moved out from the overflow holes 7 and filled between the flexible carrier body 1 and the goaf. After the gel is solidified, the flexible carrier body 1 can be firmly connected to the goaf, so that the flexible carrier body 1 can be firmly installed in the goaf.

[0038] In this embodiment, the raw material of the flexible carrier body 1 is prepared by the following steps:

[0039] A1. Use the prepreg process to pre-impregnate the glass fiber in epoxy resin to form a prepreg.

[0040] A2. Lay multiple layers of prepreg together, embed the polyurethane SMP into the multiple layers of prepreg, and use lamination technology to evenly distribute the polyurethane SMP in the prepreg to obtain a chimera.

[0041] A3. The chimera is treated by a high temperature curing process to completely cure the glass fiber and epoxy resin to obtain a flexible material.

[0042] A4. Perform surface coating treatment on the flexible material to obtain a composite material.

[0043] In this embodiment, the glass fiber is E glass fiber, the diameter of the glass fiber is 10-15 μm, and the glass transition temperature of the polyurethane SMP is 35° C.

[0044] In this embodiment, the lamination technology described in A2 uses 3 to 5 layers of glass fiber reinforced plastic, on which a layer of SMP skeleton is laid, and the pressure is controlled at 10-30 MPa for cross-lamination to enhance the overall crack resistance and toughness.

[0045] In this embodiment, the process temperature of the high temperature curing process described in A3 is 150°C to 250°C, the optimal temperature is 180°C to 200°C, the curing time is 2 to 6 hours, and after the curing is completed, the temperature is cooled to room temperature at a rate of 2°C-5°C per minute.

[0046] In this embodiment, the coating treatment process described in A4 uses high-temperature resistant aluminum oxide or zirconium oxide as the inner coating with a thickness of 0.1-0.2 mm, which acts as an oxygen barrier; and uses a polyurea coating or a fluorocarbon coating as the outer coating with a thickness of 0.2-0.5 mm, which is specifically selected according to the requirements of the coating material and the oxidation and corrosion environment in the tunnel.

[0047] The coating treatment process adopts spraying or dipping, and multiple spraying or dipping methods are used to ensure that the coating is evenly covered on the surface of the substrate. Pre-curing is required after each spraying, and final curing is performed after the next spraying to enhance the adhesion of the coating.

[0048] Coating curing: Thermal curing is performed at 180℃-200℃ for 2 hours to enhance the wear resistance and weather resistance of the coating.

[0049] An application of a flexible foldable gel carrier with shape memory function comprises the following steps:

[0050] S1. In an environment where the temperature is -20 to -10°C, the flexible carrier body 1 is folded into an S shape and then compressed. The compressed flexible carrier body 1 is then placed in a flexible tray 8, and the flexible tray 8 is placed in a thruster 9 so that the front end of the thruster 9 is aligned with the goaf.

[0051] The thruster 9 can be operated and moved by a robotic arm, and a miniature camera is provided on the robotic arm to monitor the unfolding process of the folding wall and the injection of the colloid in real time, to ensure that the wall is fully unfolded in the correct position and close to the internal structure of the goaf, and the operator can make necessary adjustments through the robotic arm during the unfolding process.

[0052] S2, the flexible tray 8 is pushed toward the front end of the pusher 9 by the hydraulic device 10, so that the flexible carrier body 1 and the flexible tray 8 are further compressed and squeezed out from the front end of the pusher 9 and enter the goaf.

[0053] The hydraulic device 10 may be operated and moved by a robotic arm.

[0054] S3, after the flexible carrier body 1 and the flexible tray 8 enter the goaf, since the temperature in the goaf is above 35°C, the polyurethane SMP is activated, driving the flexible carrier body 1 to unfold, and the flexible carrier body 1 opens the flexible tray 8 and fully stretches in the goaf. After the flexible carrier body 1 is fully stretched, it solidifies under the action of the temperature in the goaf.

[0055] S4, insert the glue injection tube into the goaf, connect the glue injection tube with the glue injection port 5, and start to inject gel into the flexible carrier body 1 under pressure. The gel fills the cavity in the flexible carrier body 1 along the drainage hole 3, and overflows from the overflow hole 7 to fill the gap between the goaf and the flexible carrier body 1. The air in the flexible carrier body 1 is discharged from the exhaust hole 6 at the top. After the gel fills the flexible carrier body 1, disconnect the glue injection tube and the glue injection port 5.

[0056] The glue injection pipe is connected and disconnected with the glue injection port 5 by controlling the mechanical arm.

[0057] S5, after 15-30 minutes, the gel solidifies, so that the flexible carrier body 1 forms a stable supporting structure, and the flexible carrier body 1 is firmly bonded to the goaf to form a stable isolation wall.

[0058] In this embodiment, the thruster is coated with insulation material so that the flexible carrier body 1 and the flexible tray can be stably maintained in a folded and compressed state inside the thruster. A push piston is fixedly connected to the output end of the hydraulic device 10, and the size of the push piston matches the inner diameter of the thruster.

[0059] In this embodiment, the flexible tray 8 is made of the same material as the flexible carrier body 1. The flexible tray 8 is cylindrical in shape. The flexible tray 8 fits the folded flexible carrier body 1. After entering the goaf, the flexible tray 8 is also unfolded and reset after being heated to release the flexible carrier body 1.

[0060] The flexible carrier body 1 is firmly bonded to the goaf to form a stable isolation wall, which can effectively separate, seal and isolate the goaf, and can also effectively absorb heat to prevent coal from spontaneous combustion.

[0061] The isolation wall formed by the flexible carrier body 1 divides the entire enclosed goaf or inaccessible disaster-causing space into several isolation areas from the opening of the cutting eye to the stop-mining line, effectively reducing the gas flow inside the goaf, which can not only reduce the air leakage from the working surface to the spontaneous combustion risk area of ​​the goaf, but also prevent the spread of toxic and harmful gases to the working surface after the spontaneous combustion risk occurs in the goaf, thereby improving the reliability of the prevention of coal spontaneous combustion in the goaf.

[0062] The above is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent change made to the above embodiment according to the technical essence of the invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A flexible and foldable gel carrier with shape memory function, characterized in that: The invention comprises a flexible carrier body (1), wherein the flexible carrier body (1) is a layered structure, the flexible carrier body (1) is made of a composite material, the composite material is made of glass fiber reinforced plastic and polyurethane SMP, the layered structure is divided into a plurality of cavities by crisscross drainage baffles (2), drainage holes (3) are provided between adjacent cavities, the top of the flexible carrier body (1) is evenly provided with glue injection ports (5), the top of the flexible carrier body (1) is also provided with a plurality of exhaust holes (6), and the outer wall of the flexible carrier body (1) is evenly provided with a plurality of overflow holes (7).

2. The flexible foldable gel carrier with shape memory function according to claim 1, characterized in that: The composite material is prepared by the following steps: A1. Use the prepreg process to pre-impregnate the glass fiber in epoxy resin to form a prepreg; A2, laying multiple layers of prepreg together, laying the polyurethane SMP skeleton on the multiple layers of prepreg, and combining the polyurethane SMP with the prepreg by lamination technology to obtain a chimera; A3, treating the chimera through a high temperature curing process to completely cure the glass fiber and epoxy resin to obtain a flexible material; A4. Perform surface coating treatment on the flexible material to obtain a composite material.

3. The flexible foldable gel carrier with shape memory function according to claim 1, characterized in that: The glass fiber is E glass fiber, the diameter of the glass fiber is 10-15 μm, and the glass transition temperature of the polyurethane SMP is 35° C.

4. The flexible foldable gel carrier with shape memory function according to claim 1, characterized in that: The inner diameter of the glue injection port (5) is 2 to 5 cm.

5. A use of a flexible foldable gel carrier with shape memory function as claimed in any one of claims 1 to 4, characterized in that: The following steps are involved: S1. In an environment where the temperature is -20 to -10°C, the flexible carrier body (1) is folded into an S shape and then compressed. The compressed flexible carrier body (1) is then placed in a flexible tray (8), and the flexible tray (8) is placed in a propeller (9) so that the front end of the propeller (9) is aligned with the goaf; S2, pushing the flexible tray (8) toward the front end of the propeller (9) through the hydraulic device (10), so that the flexible carrier body (1) and the flexible tray (8) are further compressed and squeezed out from the front end of the propeller (9) and enter the goaf; S3, after the flexible carrier body (1) and the flexible tray (8) enter the goaf, since the temperature of the goaf is above 35°C, the polyurethane SMP is activated, driving the flexible carrier body (1) to unfold, and the flexible carrier body (1) opens the flexible tray (8) and fully stretches in the goaf. After the flexible carrier body (1) is fully stretched, it solidifies under the action of the temperature of the goaf; S4, inserting the glue injection tube into the goaf, connecting the glue injection tube with the glue injection port (5), and starting to inject gel into the flexible carrier body (1) under pressure, the gel fills the cavity in the flexible carrier body (1) along the drainage hole (3), and overflows from the overflow hole (7), filling the gap between the goaf and the flexible carrier body (1), and the air in the flexible carrier body (1) is discharged from the exhaust hole (6) at the top. After the gel fills the flexible carrier body 1, the glue injection tube and the glue injection port 5 are disconnected; S5, after 15-30 minutes, the gel solidifies, so that the flexible carrier body (1) forms a stable supporting structure, and the flexible carrier body (1) is firmly bonded to the goaf to form a stable isolation wall.

6. The use of a flexible foldable gel carrier with shape memory function according to claim 7, characterized in that: The propeller is coated with heat-insulating material.

7. The use of a flexible foldable gel carrier with shape memory function according to claim 7, characterized in that: The flexible tray (8) is made of the same material as the flexible carrier body (1), and the flexible tray (8) is cylindrical in shape.

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