Coal mine surrounding rock water flowing crack blocking material and using method thereof

Abstract

The invention discloses a coal mine surrounding rock water flowing crack plugging material and a use method thereof, and belongs to the field of water flowing crack plugging materials. The coal mine surrounding rock water flowing fracture plugging material is composed of a material A and a material B, wherein the material A comprises the following components in parts by mass: 10-15 parts of modified polylactic acid, 2-5 parts of water glass, 3-20 parts of sodium bicarbonate and 100-150 parts of water; the material B is prepared from the following components in parts by mass: 0.5 to 3 parts of epoxy resin and 0.1 to 1 part of diethylenetriamine. When the plugging material is used, a target aquifer is plugged by adopting the prepared plugging material for the water-conducting fracture. The modified polylactic acid is matched with the water glass, the epoxy resin and the like, so that the prepared plugging material has high strength, can keep relatively good high-pressure resistance, can absorb water to swell, realizes a relatively good crack plugging effect, and has the advantages of corrosion resistance, environmental protection performance and the like.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of water flowing fracture plugging materials, in particular to a coal mine surrounding rock water flowing fracture plugging material and a use method of the water flowing fracture plugging material. BACKGROUND

[0002] Water flowing fracture is caused by the effects of structure, lithogenesis and weathering, etc., which leads to the broken rock and increased water permeability, and is a channel for water inrush in coal mine. In order to reduce the risk of water inrush in coal mine, it is necessary to plug the water flowing fracture of coal mine surrounding rock. Grouting is one of the most commonly used means to plug the water flowing fracture of coal mine surrounding rock. However, at present, the water plugging grouting for water flowing fracture is limited by grouting materials, and there are problems of poor effect, low efficiency and high cost.

[0003] For example, a kind of quick-setting early-strength self-stress functional grouting material and expansion testing method are disclosed in Chinese patent application publication No. CN120208627A. The grouting material is composed of A component and B component. The A component mainly includes sulphoaluminate cement, water reducing agent, retarder, sodium salt quick-setting agent and fiber. The B component mainly includes anhydrite, quicklime, water reducing agent, early strength agent, aluminum powder, retarder and fiber. It can be used as a fissure rock mass grouting reinforcement agent at high water-cement ratio, but its effect is limited when used for coal mine surrounding rock water flowing fracture plugging, and it is difficult to form a dense plugging layer. SUMMARY

[0004] In view of the above technical problems, the present application provides a coal mine surrounding rock water flowing fracture plugging material and a use method thereof.

[0005] The technical solution adopted by the present application is as follows:

[0006] A coal mine surrounding rock water flowing fracture plugging material is composed of A material and B material. The A material includes the following components by mass fraction: modified polylactic acid 10-15 parts, water glass 2-5 parts, sodium bicarbonate 3-20 parts, and water 100-150 parts. The B material includes the following components by mass fraction: epoxy resin 0.5-3 parts, and diethylenetriamine 0.1-1 part.

[0007] Preferably, the modified polylactic acid is prepared by the following steps: selecting maleic anhydride, glycidyl methacrylate and dicumyl peroxide as modified raw materials, dissolving them in an acetone solution, adding polylactic acid and mixing uniformly, standing, and then mixing uniformly through a torque rheometer mixing head after the acetone is volatilized, and cooling to obtain the modified polylactic acid.

[0008] Preferably, the weight ratio of the maleic anhydride, the glycidyl methacrylate and the dicumyl peroxide is 2-3:2-3:1-2; the mass fraction of the acetone solution is 60%-80%; the amount of the acetone solution is 0.3-0.5 times the mass of the maleic anhydride; and the amount of the polylactic acid is 2-3 times the mass of the maleic anhydride.

[0009] The use method of the coal mine surrounding rock water conducting fracture plugging material as described above comprises the following steps:

[0010] (1) preparing modified polylactic acid;

[0011] (2) preparing the water conducting fracture plugging material;

[0012] The modified polylactic acid is added into water, then heated and stirred, and then water glass and sodium bicarbonate are added and uniformly stirred to prepare A material;

[0013] The epoxy resin and diethylene triamine are uniformly mixed to prepare B material;

[0014] The A material and the B material are uniformly mixed to prepare the water conducting fracture plugging material;

[0015] (3) plugging the target aquifer with the water conducting fracture plugging material prepared in step (2).

[0016] Preferably, in step (1), when the modified polylactic acid is prepared, the mixing conditions are controlled as follows: the mixing head temperature is 170-180 DEG C, the rotating speed is 40-50 r / min, and the time is 8-10 min.

[0017] Preferably, in step (2), the modified polylactic acid is added into water, heated to 80-90 DEG C, and stirred at the temperature for 20-30 min.

[0018] Preferably, in step (2), the mass ratio of the A material to the B material is 1-2:1.

[0019] The present application has the following beneficial technical effects:

[0020] (1) The modified polylactic acid is combined with water glass, epoxy resin and the like in the present application, and the prepared plugging material has high strength, can maintain good high-pressure resistance, can be water-absorbed and swelled, can achieve good fracture plugging effect, and has advantages such as corrosion resistance and environmental protection.

[0021] (2) The application synthesizes a co-grafted polylactic acid with double active groups by grafting maleic anhydride and the like on a polylactic acid segment, and then combines the co-grafted polylactic acid with an epoxy resin, so that the obtained polylactic acid composite has the effects of degradability, water absorption, high toughness and the like, and further combined with water glass and the like, the plugging material can self-adaptively expand according to the width of the water-conducting fissure after being injected into the water-conducting fissure of the coal mine surrounding rock, so that the water-conducting fissure is better plugged. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a flowchart of the use method of the coal mine surrounding rock water-conducting fissure plugging material. DETAILED DESCRIPTION

[0023] The application will be further described below in combination with the drawings and specific embodiments.

[0024] Example 1

[0025] A coal mine surrounding rock water-conducting fissure plugging material is composed of A material and B material, the A material includes the following components by mass fraction: modified polylactic acid 10 parts, water glass 5 parts, sodium bicarbonate 3 parts, water 100 parts; the B material includes the following components by mass fraction: epoxy resin 3 parts, diethylenetriamine 0.1 part.

[0026] The modified polylactic acid is prepared by the following steps: selecting maleic anhydride, glycidyl methacrylate and dicumyl peroxide as modified raw materials, dissolving them in an acetone solution, then adding polylactic acid and mixing uniformly, standing, and then mixing uniformly by a torque rheometer mixing head after the acetone volatilizes, and cooling to obtain the modified polylactic acid.

[0027] The weight ratio of the maleic anhydride, glycidyl methacrylate and dicumyl peroxide is 3:2:1; the mass fraction of the acetone solution is 80%; the amount of the acetone solution is 0.3 times the mass of the maleic anhydride; and the amount of the polylactic acid is 3 times the mass of the maleic anhydride.

[0028] In the preparation of the modified polylactic acid, the mixing conditions are controlled as follows: the mixing head temperature is 170℃, the rotating speed is 50r / min, and the time is 8min.

[0029] Example 2

[0030] A coal mine surrounding rock water-conducting fissure plugging material is composed of A material and B material, the A material includes the following components by mass fraction: modified polylactic acid 15 parts, water glass 2 parts, sodium bicarbonate 10 parts, water 100 parts; the B material includes the following components by mass fraction: epoxy resin 1 part, diethylenetriamine 0.5 part.

[0031] The modified polylactic acid is prepared by the following steps: maleic anhydride, glycidyl methacrylate and dicumyl peroxide are selected as the modified raw materials, which are dissolved in an acetone solution, then polylactic acid is added and uniformly mixed, and after standing until the acetone volatilizes, the mixture is uniformly mixed by a torque rheometer mixing head, and the modified polylactic acid is prepared after cooling.

[0032] The weight ratio of the maleic anhydride, glycidyl methacrylate and dicumyl peroxide is 2:3:1; the mass fraction of the acetone solution is 80%; the amount of the acetone solution is 0.5 times the mass of the maleic anhydride; and the amount of the polylactic acid is 2 times the mass of the maleic anhydride.

[0033] In the preparation of the modified polylactic acid, the mixing conditions are controlled as follows: the mixing head temperature is 180℃, the rotating speed is 40r / min, and the time is 10min.

[0034] Example 3

[0035] A coal mine surrounding rock water-guided fracture plugging material is composed of A material and B material, the A material comprises the following components by mass fraction: modified polylactic acid 12 parts, water glass 3 parts, sodium bicarbonate 15 parts, and water 100 parts; the B material comprises the following components by mass fraction: epoxy resin 2 parts, diethylenetriamine 0.5 parts.

[0036] The modified polylactic acid is prepared by the following steps: maleic anhydride, glycidyl methacrylate and dicumyl peroxide are selected as the modified raw materials, which are dissolved in an acetone solution, then polylactic acid is added and uniformly mixed, and after standing until the acetone volatilizes, the mixture is uniformly mixed by a torque rheometer mixing head, and the modified polylactic acid is prepared after cooling.

[0037] The weight ratio of the maleic anhydride, glycidyl methacrylate and dicumyl peroxide is 2:3:1; the mass fraction of the acetone solution is 80%; the amount of the acetone solution is 0.5 times the mass of the maleic anhydride; and the amount of the polylactic acid is 2 times the mass of the maleic anhydride.

[0038] In the preparation of the modified polylactic acid, the mixing conditions are controlled as follows: the mixing head temperature is 180℃, the rotating speed is 40r / min, and the time is 10min.

[0039] Example 4

[0040] As shown in Figure 1 A use method of a coal mine surrounding rock water-guided fracture plugging material, comprising the following steps:

[0041] (1) preparing modified polylactic acid.

[0042] Maleic anhydride, glycidyl methacrylate and dicumyl peroxide are selected as the modification raw materials, the weight ratio of maleic anhydride, glycidyl methacrylate and dicumyl peroxide is 3:2:1, the maleic anhydride, glycidyl methacrylate and dicumyl peroxide are dissolved in an acetone solution, the mass fraction of the acetone solution is 80%, the amount of the acetone solution is 0.3 times of the mass of the maleic anhydride, a mixed solution is obtained. Then, polylactic acid is added into the mixed solution and mixed uniformly, the amount of the polylactic acid is 3 times of the mass of the maleic anhydride, the mixed solution is left to stand for 1 hour, and then is mixed uniformly by a torque rheometer mixing head after the acetone is volatilized, the mixing head temperature is controlled at 180 DEG C, the rotating speed is 40 r / min, and the mixing time is 10 min, and a modified polylactic acid is prepared by cooling.

[0043] (2) preparing a water flowing fracture plugging material;

[0044] According to the amount ratio of 10 parts of modified polylactic acid, 5 parts of water glass, 3 parts of sodium bicarbonate and 100 parts of water, the modified polylactic acid is added into water, then the temperature is increased to 90 DEG C and stirred for 20 min, then the water glass and the sodium bicarbonate are added and stirred uniformly, and A material is prepared.

[0045] According to the amount ratio of 3 parts of epoxy resin and 0.1 parts of diethylene triamine, the epoxy resin and the diethylene triamine are uniformly mixed, and B material is prepared.

[0046] The A material and the B material are uniformly mixed, and the mass ratio of the A material and the B material is controlled at 1:1, and a water flowing fracture plugging material is prepared.

[0047] (3) the water flowing fracture plugging material is used for plugging in a target aquifer.

[0048] Of course, the above description is not a limitation of the present application, the present application is not limited to the above-mentioned embodiments, and the changes, modifications, additions or replacements made by the person skilled in the art within the essential scope of the present application shall belong to the protection scope of the present application.

Claims

1. A material for sealing water-conducting fractures in coal mine surrounding rock, characterized in that, It is composed of component A and component B. Component A includes the following components by mass fraction: 10-15 parts modified polylactic acid, 2-5 parts water glass, 3-20 parts sodium bicarbonate, and 100-150 parts water. Component B includes the following components by mass fraction: 0.5-3 parts epoxy resin and 0.1-1 parts diethylenetriamine.

2. The coal mine surrounding rock water-conducting fracture sealing material according to claim 1, characterized in that, The modified polylactic acid is prepared by the following steps: maleic anhydride, glycidyl methacrylate and dicumyl peroxide are selected as modifying raw materials, dissolved together in acetone solution, polylactic acid is added and mixed evenly, allowed to stand, and after the acetone evaporates, it is mixed evenly by the internal mixing head of a torque rheometer and cooled to obtain modified polylactic acid.

3. The coal mine surrounding rock water-conducting fracture sealing material according to claim 1, characterized in that, The weight ratio of maleic anhydride, glycidyl methacrylate, and dicumyl peroxide is 2-3:2-3:1-2; the mass fraction of the acetone solution is 60%-80%; the amount of acetone solution used is 0.3-0.5 times the mass of maleic anhydride; and the amount of polylactic acid used is 2-3 times the mass of maleic anhydride.

4. The method of using the coal mine surrounding rock water-conducting fracture sealing material as described in any one of claims 1-3, characterized in that, Includes the following steps: (1) Preparation of modified polylactic acid; (2) Preparation of water-conducting fissure sealing materials; Modified polylactic acid was added to water, then heated and stirred. Water glass and sodium bicarbonate were added, and the mixture was stirred until homogeneous to prepare material A. Epoxy resin and diethylenetriamine were uniformly mixed to prepare material B. Material A and material B are mixed evenly to obtain a water-conducting fissure sealing material; (3) The water-conducting fracture sealing material prepared in step (2) is used to seal the target aquifer.

5. The method of using a coal mine surrounding rock water-conducting fracture sealing material according to claim 4, characterized in that, In step (1), when preparing modified polylactic acid, the mixing conditions are controlled as follows: mixing head temperature 170-180℃, rotation speed 40-50r / min, and time 8-10min.

6. The method of using a coal mine surrounding rock water-conducting fracture sealing material according to claim 4, characterized in that, In step (2), the modified polylactic acid is added to water, heated to 80-90°C, and stirred at that temperature for 20-30 minutes.

7. The method of using a coal mine surrounding rock water-conducting fracture sealing material according to claim 4, characterized in that, In step (2), the mass ratio of material A to material B is 1-2:1.

Images