Inorganic phase-change gel grouting material for mining as well as preparation method and use method of inorganic phase-change gel grouting material

Abstract

The invention discloses a mineral inorganic phase change gel grouting material as well as a preparation method and a use method thereof. The grouting material comprises the following components in parts by weight: 100 parts of a base material and 7-30 parts of an auxiliary agent, wherein the auxiliaries comprise 0.5 to 5.0 parts of a toughening agent, 0.5 to 5.0 parts of a suspending agent, 1.0 to 3.5 parts of an adhesive, 0.5 to 1.5 parts of a water reducing agent, 3.0 to 7.0 parts of a reinforcing agent, 0.03 to 1.0 part of an expanding agent, 1.0 to 6.0 parts of a speed regulating agent and 0.2 to 1.0 part of a permeation increasing agent. The mineral inorganic phase change gel grouting material is a single-component powder material, and compared with a traditional double-component grouting material or a liquid material, the mineral inorganic phase change gel grouting material has a higher operation error-tolerant rate, and the transportation and construction convenience can be effectively improved; and the mineral inorganic phase change gel grouting material has excellent adhesion and permeability to coal, and can effectively improve the stability of a sealing structure and the sealing performance of a drill hole.

Description

Technical Field

[0001] This invention belongs to the field of borehole sealing technology. Specifically, this invention relates to a mining inorganic phase change gel grouting material and its preparation and application methods. Background Technology

[0002] Borehole sealing technology is a key means of utilizing gas resources, mitigating the greenhouse effect, preventing gas disasters, and controlling water hazards. Borehole sealing materials (i.e., grouting materials) play a crucial role in improving extraction efficiency and ensuring coal mine safety by sealing gas leakage channels and reinforcing the surrounding rock. However, with the large-scale development of deep coal resources, traditional grouting materials are insufficient to meet application requirements, increasing the risk of mine disasters. Therefore, developing new grouting materials suitable for complex coal seam conditions is of great significance for disaster prevention and control, efficient gas utilization, and the construction of green mines.

[0003] Cement, as the most widely used and oldest filler material, is widely used in mine grouting and sealing due to its advantages such as stable strength, reliable performance, low cost, abundant raw materials, and ease of operation. However, traditional cement grouting and sealing methods suffer from low efficiency, large consumption, and shrinkage after hardening leading to sealing failure and reduced extraction efficiency. Furthermore, cement production consumes a large amount of resources and emits significant amounts of greenhouse gases, resulting in resource waste and environmental pollution. Meanwhile, common polymer grouting materials such as polyurethane, silicate-polyurethane composites, and epoxy resins generate substantial amounts of heat when used for borehole sealing, threatening coal mine safety. These challenges limit the application of traditional grouting materials in high-performance borehole sealing.

[0004] In view of this, the present invention is hereby proposed. Summary of the Invention

[0005] This invention aims to at least partially solve one of the technical problems in related technologies. To this end, embodiments of this invention propose a mining inorganic phase change gel grouting material, its preparation method, and its application method.

[0006] To achieve the above-mentioned objectives, the present invention adopts the following technical solution: In a first aspect, embodiments of the present invention provide a mining inorganic phase change gel grouting material, comprising the following components in parts by weight: 100 parts of base material and 7-30 parts of additives; wherein the additives include 0.5-5.0 parts of toughening agent, 0.5-5.0 parts of suspending agent, 1.0-3.5 parts of adhesive, 0.5-1.5 parts of water-reducing agent, 3.0-7.0 parts of reinforcing agent, 0.03-1.0 parts of expanding agent, 1.0-6.0 parts of speed-regulating agent, and 0.2-1.0 parts of permeability enhancer.

[0007] In some embodiments, the base material includes at least one of sulfoaluminate cement, silicate cement, cement clinker, and aluminate cement.

[0008] In some embodiments, the toughening agent comprises polyvinyl alcohol and borax in a mass ratio of (0.4~4.5):(0.1~0.6).

[0009] In some embodiments, the suspending agent comprises cellulose ether, polyvinylpyrrolidone, styrax, and starch ether in a mass ratio of (0.3~2.5):(0~1.0):(0.2~1.0):(0~2.0).

[0010] In some embodiments, the adhesive includes at least one of 801 adhesive powder, 901 adhesive powder, redispersible latex powder, and polyacrylamide.

[0011] In some embodiments, the water-reducing agent is a polycarboxylate water-reducing agent or a naphthalene-based water-reducing agent.

[0012] In some embodiments, the reinforcing agent includes at least one of mineral powder, fumed silica, and silica fume.

[0013] In some embodiments, the expanding agent includes at least one of calcium oxide expanding agents, sulfoaluminate expanding agents, and plastic expanding agents; And / or, the speed regulator includes at least one of calcium formate, sodium aluminate, lithium carbonate, citric acid, and sodium citrate; And / or, the penetration enhancer includes at least one of sodium dodecyl sulfonate and sodium dodecylbenzene sulfonate.

[0014] Secondly, embodiments of the present invention also propose a method for preparing a mining inorganic phase change gel grouting material as described in the first aspect, comprising the following steps: Toughening agent, suspending agent, adhesive, water-reducing agent, reinforcing agent, swelling agent, speed regulator and penetration enhancer are mixed to obtain the additive; The base material and the additives are then stirred and mixed to obtain the mineral inorganic phase change gel grouting material.

[0015] Thirdly, embodiments of the present invention further propose a method of using the mining inorganic phase change gel grouting material as described in the first aspect or the mining inorganic phase change gel grouting material prepared by the preparation method described in the second aspect, comprising at least one of the following methods: (i) Mix water and mineral inorganic phase change gel grouting material at a mass ratio of (0.5~2):1 to form a grouting liquid, and then use the grouting liquid for rigid sealing; (ii) Mix water and mineral inorganic phase change gel grouting material at a mass ratio of (2~4):1 to form a grouting liquid, and then use the grouting liquid for flexible sealing.

[0016] The advantages and beneficial effects of the embodiments of the present invention are as follows: (1) The inorganic phase change gel grouting material for mining in the embodiments of the present invention is a single-component powder material. Compared with traditional two-component grouting materials or liquid materials, it has a higher operational error tolerance rate and can effectively improve the convenience of transportation and construction. It can also avoid the problems of difficult disposal and high transportation cost after leakage of liquid materials, the inability of a single component of two-component grouting materials to be used alone or the performance fluctuation caused by the ratio deviation, and significantly improve the stability and operability in engineering applications.

[0017] (2) The inorganic phase change gel grouting material for mining in the embodiments of the present invention has good permeability and adhesion. It can form a dense sealing structure with the surrounding rock of the borehole under high water-cement ratio conditions, effectively improving the stability of the sealing structure and the sealing performance of the borehole. In addition, the amount of inorganic phase change gel grouting material for mining in the embodiments of the present invention can be reduced by more than 30% compared with traditional grouting materials, saving costs.

[0018] (3) The inorganic phase change gel grouting material for mining in the embodiments of the present invention can be prepared into grouting and sealing materials with different properties by simply adjusting the water-cement ratio according to actual needs. It can be adapted to pressure-holding grouting devices, filter-accumulation bag grouting devices, and segmented grouting for “low water-cement ratio rigid section + high water-cement ratio flexible section”, meeting different performance requirements of borehole sealing and has a wide range of applications. Attached Figure Description

[0019] Figure 1 This is a test diagram showing the permeability and adhesion of the inorganic phase change gel grouting material for mining prepared in Example 6 of the present invention to coal. Detailed Implementation

[0020] The embodiments of the present invention are described in detail below. These embodiments are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0021] In this invention, when a value is described as a range, it should be understood that such disclosure includes disclosure of all possible subranges within that range, as well as specific numerical values ​​falling within that range, regardless of whether specific numerical values ​​or specific subranges are explicitly specified.

[0022] In this invention, the terms “comprising” and “including” and their various variations mean that other elements or wholes may be included but are not specifically described.

[0023] In this invention, the term "and / or" is merely a description of the relationship between related objects, indicating that there can be three relationships. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone.

[0024] In a first aspect, embodiments of the present invention provide a mining inorganic phase change gel grouting material, comprising the following components in parts by weight: 100 parts of base material and 7-30 parts of additives; wherein the additives include 0.5-5.0 parts of toughening agent, 0.5-5.0 parts of suspending agent, 1.0-3.5 parts of adhesive, 0.5-1.5 parts of water-reducing agent, 3.0-7.0 parts of reinforcing agent, 0.03-1.0 parts of expanding agent, 1.0-6.0 parts of speed-regulating agent, and 0.2-1.0 parts of permeability enhancer.

[0025] Traditional two-component grouting materials require precise calculations of the volume or mass of the two components before use, which can easily lead to mixing ratio deviations and result in discrepancies between the expected setting time and strength. In contrast, the mining inorganic phase change gel grouting material in this embodiment is a single-component powder material, which can significantly reduce performance instability caused by on-site mixing ratio fluctuations, has a higher operational error tolerance, and effectively improves the convenience of transportation and construction. This mining inorganic phase change gel grouting material can be mixed with water in different proportions to form a slurry according to on-site sealing requirements. The process is simple, the performance is adjustable, and it avoids the problem that either component in a two-component grouting system cannot be used independently. Moreover, the powder has good storage stability under normal temperature and pressure conditions, improving the reliability of the material. For the complex and confined working spaces underground, the powder packaging is small in size and flexible in handling, which can effectively reduce the labor intensity of workers and reduce the overall cost of transportation and storage.

[0026] In some embodiments, the base material includes at least one of sulfoaluminate cement, silicate cement, cement clinker, and aluminate cement.

[0027] In some embodiments, the toughening agent comprises polyvinyl alcohol and borax in a mass ratio of (0.4~4.5):(0.1~0.6). By compounding polyvinyl alcohol and borax, a dynamic cross-linked network structure can be constructed in the cement hydration system. After grouting, rapid cross-linking can be achieved, improving the overall structural strength and toughness, inhibiting sedimentation, stratification, and bleeding, and achieving toughening and adaptive closure of microcracks. At the same time, by adding borax, it has a retarding effect on cement hydration, which can prevent the cement system from solidifying prematurely. Furthermore, the inventors have found through research that if the amount of borax added is too high, it will lead to excessive cross-linking of polyvinyl alcohol, resulting in excessively high viscosity of the grout at a low water-cement ratio, making grouting impossible, and also excessively prolonging the setting time of the grouting material; however, if the amount of borax added is too low, the gel network in the system will not be able to form, making it difficult to exert the strengthening and toughening effect. Therefore, it is advantageous to control the mass ratio of polyvinyl alcohol to borax within the above-mentioned range in the embodiments of the present invention.

[0028] In some embodiments, the suspending agent comprises cellulose ether, polyvinylpyrrolidone, styrax, and starch ether in a mass ratio of (0.3~2.5):(0~1.0):(0.2~1.0):(0~2.0). By adding a suspending agent to the grouting material, sedimentation and stratification can be effectively prevented during the preparation and use of the grouting material, thus maintaining the uniformity and stability of the grouting system.

[0029] In some embodiments, the adhesive includes at least one of 801 adhesive powder, 901 adhesive powder, redispersible latex powder, and polyacrylamide. Adding an adhesive can enhance the interfacial bonding between the grouting material and the surrounding rock of the borehole, thereby improving the stability of the sealing structure.

[0030] In some embodiments, the water-reducing agent is a polycarboxylate water-reducing agent or a naphthalene-based water-reducing agent. By adding a water-reducing agent, the amount of water used can be reduced, the fluidity of the grouting fluid can be improved, and the grouting performance can be enhanced without affecting the strength of the grouting material.

[0031] In some embodiments, the reinforcing agent includes at least one of mineral powder, fumed silica, and silica fume. By adding the reinforcing agent, the active components in the reinforcing agent can undergo a secondary reaction with cement hydration products, thereby filling pores and improving the density and strength of the grouting material.

[0032] In some embodiments, the expanding agent includes at least one of calcium oxide expanding agent, sulfoaluminate expanding agent, and plastic expanding agent. By adding the expanding agent, it can generate moderate expansion during the hardening process of the grouting material, compensate for shrinkage, prevent cracks from forming, and enhance the sealing effect. And / or, the speed regulator includes at least one of calcium formate, sodium aluminate, lithium carbonate, citric acid, and sodium citrate. By adding the speed regulator, the hydration rate of cement can be adjusted, thereby achieving precise control over the setting time of the grouting material. And / or, the permeation enhancer includes at least one of sodium dodecyl sulfonate and sodium dodecylbenzene sulfonate. The permeation enhancers selected in the embodiments of the present invention are all surfactants, which can reduce surface tension, improve the permeability of grouting fluid, make grouting fluid easier to enter coal and rock fractures, and improve the permeation radius and sealing performance.

[0033] Secondly, embodiments of the present invention also propose a method for preparing a mining inorganic phase change gel grouting material as described in the first aspect, comprising the following steps: Toughening agent, suspending agent, adhesive, water-reducing agent, reinforcing agent, swelling agent, speed regulator and penetration enhancer are mixed to obtain the additive; The base material and the additives are then stirred and mixed to obtain the mineral inorganic phase change gel grouting material.

[0034] Thirdly, embodiments of the present invention further propose a method of using the mining inorganic phase change gel grouting material as described in the first aspect or the mining inorganic phase change gel grouting material prepared by the preparation method described in the second aspect, comprising at least one of the following methods: (i) Mix water and mineral inorganic phase change gel grouting material at a mass ratio of (0.5~2):1 to form a grouting liquid, and then use the grouting liquid for rigid sealing; (ii) Mix water and mineral inorganic phase change gel grouting material at a mass ratio of (2~4):1 to form a grouting liquid, and then use the grouting liquid for flexible sealing. The mixing time is 3-5 minutes.

[0035] It should be noted that in the above method (ii), when performing flexible sealing, the mass ratio of water to mining inorganic phase change gel grouting material is adjusted to (2~4):1, which does not include the boundary ratio of 2:1.

[0036] The inorganic phase change gel grouting material for mining described in this invention is adaptable to pressure-holding and filter-accumulation bag sealers, and covers different mix proportions and sealing requirements. For example, in rigid / flexible composite sealing processes, using filter-accumulation bag sealers helps to further stabilize the plug strength, reduce construction labor intensity and overall costs, and improve borehole sealing quality and the stability of extraction effects. In the rigid sealing stage: In the initial stage of borehole sealing, the grouting liquid formed by the mining inorganic phase change gel grouting material of the present invention is injected into the borehole through the grouting equipment to form a rigid sealing structure, which plays a preliminary sealing and reinforcement role for the borehole. In the flexible sealing stage: considering the mine's needs and site conditions, including water inflow and fracture development, a flexible material paired with a pressure-holding borehole sealer can be used for sealing; alternatively, a filter-accumulation bag sealer can be used, employing a segmented sealing process of "low water-cement ratio rigid section + high water-cement ratio flexible section" for borehole sealing. For the mining inorganic phase change gel grouting material in this embodiment, adjusting the water-cement ratio to 2.0~4.0, under high water-cement ratio conditions, the cement consolidation body forms more slowly, and the water-soluble polymer network dominates. The water-soluble polymer can adsorb onto the surface of cement particles in the early stages of cement hydration, slowing down the hydration process, while simultaneously constructing a polymer network with certain strength and flexibility, forming a flexible sealing material with good plasticity. The flexible sealing material is injected into the middle region of the borehole, allowing it to fully fill the borehole gaps and tightly bond with the rigid sealing structure. Grouting is stopped after pressure holding. This flexible sealing layer effectively absorbs the deformation energy of the surrounding rock, forming a rigid-flexible composite sealing structure together with the rigid sealing structure, significantly improving the sealing performance and long-term stability of the borehole sealing section.

[0037] The inorganic phase change gel grouting material for mining in this embodiment of the invention can obtain a uniform, stable, and low-stratification grouting liquid within a water-cement ratio range of 0.5 to 4.0. Thus, by simply adjusting the water-cement ratio, a grouting material with adjustable strength can be constructed, which greatly simplifies the grouting and sealing process and can meet the drilling sealing requirements under different geological conditions and engineering requirements, significantly reducing labor intensity and cost.

[0038] The following are non-limiting embodiments and comparative examples of the present invention. It should be noted that the schemes in the comparative examples are not prior art, but are only set up for comparison with the schemes in the embodiments, and are not intended to limit the present invention. Unless otherwise stated, all raw materials used in the embodiments and comparative examples are conventional commercially available products, or can be prepared by known methods.

[0039] Example 1 This embodiment provides a mining inorganic phase change gel grouting material, comprising the following components in parts by weight: 100 parts base material and 20 parts additives; wherein the base material includes 70 parts sulfoaluminate cement and 30 parts silicate cement; the additives include 2 parts toughening agent, 3 parts suspending agent, 1 part adhesive, 1 part water reducing agent, 6 parts reinforcing agent, 0.8 parts expanding agent, 6 parts speed regulating agent, and 0.2 parts permeability enhancing agent.

[0040] In this embodiment, the toughening agent includes 1.6 parts of polyvinyl alcohol and 0.4 parts of borax.

[0041] In this embodiment, the suspending agent includes 2 parts of cellulose ether and 1 part of thymol.

[0042] In this embodiment, the adhesive includes 0.8 parts of 801 adhesive powder and 0.2 parts of polyacrylamide.

[0043] In this embodiment, the water-reducing agent is a polycarboxylate water-reducing agent.

[0044] In this embodiment, the reinforcing agent is mineral powder.

[0045] In this embodiment, the expanding agent includes 0.75 parts of calcium oxide expanding agent and 0.05 parts of plastic expanding agent.

[0046] In this embodiment, the speed regulator includes 2 parts calcium formate, 1 part lithium carbonate, and 3 parts sodium citrate.

[0047] In this embodiment, the penetration enhancer is sodium dodecyl sulfonate.

[0048] This embodiment also provides a method for preparing the above-mentioned inorganic phase change gel grouting material for mining, including the following steps: Toughening agent, suspending agent, adhesive, water-reducing agent, reinforcing agent, expanding agent, speed regulator and penetration enhancer are stirred and mixed evenly to obtain the additives; then the base material and additives are stirred and mixed evenly to obtain the mineral inorganic phase change gel grouting material.

[0049] This embodiment also provides a method for using the above-mentioned inorganic phase change gel grouting material for mining, including the following steps: Mix the above-mentioned gel grouting material with 60 parts water (i.e., water-cement ratio of 0.5) for 5 minutes to form a grouting liquid, and then the grouting construction can begin.

[0050] Example 2 This embodiment provides a mining inorganic phase change gel grouting material, comprising the following components in parts by weight: 100 parts base material and 15 parts additives; wherein the base material includes 60 parts sulfoaluminate cement, 20 parts aluminate cement, and 20 parts silicate cement; the additives include 3 parts toughening agent, 2 parts suspending agent, 1 part adhesive, 1 part water-reducing agent, 3 parts reinforcing agent, 0.7 parts expanding agent, 4 parts speed-regulating agent, and 0.3 parts permeability enhancer.

[0051] In this embodiment, the toughening agent includes 2.4 parts of polyvinyl alcohol and 0.6 parts of borax.

[0052] In this embodiment, the suspending agent includes 1 part cellulose ether, 0.5 parts polyvinylpyrrolidone, and 0.5 parts warm wheel gum.

[0053] In this embodiment, the adhesive is 901 adhesive powder.

[0054] In this embodiment, the water-reducing agent is a polycarboxylate water-reducing agent.

[0055] In this embodiment, the reinforcing agent includes 2 parts of mineral powder and 1 part of fumed silica.

[0056] In this embodiment, the expanding agent includes 0.6 parts of sulfoaluminate expanding agent and 0.1 parts of plastic expanding agent.

[0057] In this embodiment, the speed regulator includes 1 part lithium carbonate and 3 parts sodium citrate.

[0058] In this embodiment, the penetration enhancer is sodium dodecyl sulfonate.

[0059] This embodiment also provides a method for preparing the above-mentioned inorganic phase change gel grouting material for mining, including the following steps: Toughening agent, suspending agent, adhesive, water-reducing agent, reinforcing agent, expanding agent, speed regulator and penetration enhancer are stirred and mixed evenly to obtain the additives; then the base material and additives are stirred and mixed evenly to obtain the mineral inorganic phase change gel grouting material.

[0060] This embodiment also provides a method for using the above-mentioned inorganic phase change gel grouting material for mining, including the following steps: Mix the above-mentioned gel grouting material with 57.5 parts water (i.e., water-cement ratio of 0.5) for 5 minutes to form a grouting liquid, and then the grouting construction can begin.

[0061] Example 3 This embodiment is basically the same as embodiment 1, except that: in the inorganic phase change gel grouting material for mining in this embodiment, the speed regulator includes 1 part calcium formate, 1 part sodium aluminate, and 4 parts citric acid.

[0062] Example 4 This embodiment is basically the same as Embodiment 1, except that: in this embodiment, the base material of the inorganic phase change gel grouting material for mining includes 80 parts of silicate cement and 20 parts of cement clinker; the expansion agent in the additives includes 0.6 parts of calcium oxide expansion agent and 0.2 parts of plastic expansion agent.

[0063] Example 5 This embodiment is basically the same as Embodiment 1, except that: in the method of using the inorganic phase change gel grouting material for mining in this embodiment, the amount of water is 120 parts (i.e., the water-cement ratio is 1).

[0064] Example 6 This embodiment is basically the same as Embodiment 1, except that: in the method of using the inorganic phase change gel grouting material for mining in this embodiment, the amount of water is 180 parts (i.e., the water-cement ratio is 1.5).

[0065] Example 7 This embodiment is basically the same as Embodiment 1, except that: in the method of using the inorganic phase change gel grouting material for mining in this embodiment, the amount of water is 240 parts (i.e., the water-cement ratio is 2).

[0066] Example 8 This embodiment is basically the same as Embodiment 1, except that: in the method of using the inorganic phase change gel grouting material for mining in this embodiment, the amount of water is 480 parts (i.e., the water-cement ratio is 4).

[0067] Comparative Example 1 This comparative example is basically the same as Example 6, except that: the additives in this comparative example of the inorganic phase change gel grouting material for mining do not include toughening agents; and in the method of using this inorganic phase change gel grouting material for mining, the amount of grouting material is 118 parts and the amount of water is 177 parts (i.e., the water-cement ratio is 1.5).

[0068] Comparative Example 2 This comparative example is basically the same as Example 5, except that the toughening agent of the inorganic phase change gel grouting material for mining in this comparative example is only polyvinyl alcohol and does not contain borax.

[0069] Comparative Example 3 This comparative example is basically the same as Example 6, except that the mass ratio of polyvinyl alcohol to borax in the toughening agent of the inorganic phase change gel grouting material for mining in this comparative example is 1:1.

[0070] Comparative Example 4 This comparative example is basically the same as Example 6, except that: the amount of reinforcing agent added in the inorganic phase change gel grouting material for mining in this comparative example is 1 part; and in the method of using the inorganic phase change gel grouting material for mining, the amount of grouting material is 115 parts and the amount of water is 172.5 parts (i.e., the water-cement ratio is 1.5).

[0071] The permeability and adhesion of the inorganic phase change gel grouting material for mining prepared in Example 6 of this invention were tested. The test method was as follows: coal powder smaller than 50 mesh was used as a matrix, and the inorganic phase change gel grouting material for mining prepared in Example 6 was poured on it. After the material solidified, a sample at the interface was taken for scanning electron microscopy testing. The results are as follows. Figure 1 As shown in the figure, the inorganic phase change gel grouting material for mining can penetrate into the gaps between coal powder particles and bind the loose coal powder into a whole. The interface between the two is tightly bonded, demonstrating the good penetration ability and adhesion performance of the inorganic phase change gel grouting material for coal powder.

[0072] The 1-day strength of the grouting materials prepared in the above embodiments and comparative examples was tested, and the results are shown in Table 1.

[0073] Table 1

[0074] As shown in Table 1, under the same water-cement ratio, the grouting material prepared in this embodiment of the invention has a higher 1-day strength compared to the comparative example. This is mainly because the formulation of the grouting material in this embodiment of the invention is optimized and the amount of each component is strictly controlled. Specifically, by adding a toughening agent, a three-dimensional network can be constructed in the grouting material, thereby improving its strength. However, when the borax content in the toughening agent is too high, it will have a retarding effect on the grouting material, inhibiting early hydration and thus reducing the 1-day strength. The reinforcing agent can improve the strength of the grouting material by filling pores and undergoing a secondary reaction with cement hydration products, while the speed-regulating agent affects its strength by controlling the hydration rate of the grouting material.

[0075] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0076] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A mining inorganic phase change gel grouting material, characterized in that, The product comprises the following components in parts by weight: 100 parts base material and 7-30 parts additives; wherein the additives include 0.5-5.0 parts toughening agent, 0.5-5.0 parts suspending agent, 1.0-3.5 parts adhesive, 0.5-1.5 parts water-reducing agent, 3.0-7.0 parts reinforcing agent, 0.03-1.0 parts expanding agent, 1.0-6.0 parts speed regulator, and 0.2-1.0 parts penetration enhancer.

2. The inorganic phase change gel grouting material for mining according to claim 1, characterized in that, The base material includes at least one of sulfoaluminate cement, silicate cement, cement clinker, and aluminate cement.

3. The inorganic phase change gel grouting material for mining according to claim 1, characterized in that, The toughening agent comprises polyvinyl alcohol and borax in a mass ratio of (0.4~4.5):(0.1~0.6).

4. The inorganic phase change gel grouting material for mining according to claim 1, characterized in that, The suspending agent comprises cellulose ether, polyvinylpyrrolidone, styrax and starch ether in a mass ratio of (0.3~2.5):(0~1.0):(0.2~1.0):(0~2.0).

5. The inorganic phase change gel grouting material for mining according to claim 1, characterized in that, The adhesive includes at least one of 801 adhesive powder, 901 adhesive powder, redispersible latex powder, and polyacrylamide.

6. The inorganic phase change gel grouting material for mining according to claim 1, characterized in that, The water-reducing agent is a polycarboxylate water-reducing agent or a naphthalene-based water-reducing agent.

7. The inorganic phase change gel grouting material for mining according to claim 1, characterized in that, The reinforcing agent includes at least one of mineral powder, fumed silica, and silica fume.

8. The inorganic phase change gel grouting material for mining according to claim 1, characterized in that, The expanding agent includes at least one of calcium oxide expanding agents, sulfoaluminate expanding agents, and plastic expanding agents; And / or, the speed regulator includes at least one of calcium formate, sodium aluminate, lithium carbonate, citric acid, and sodium citrate; And / or, the penetration enhancer includes at least one of sodium dodecyl sulfonate and sodium dodecylbenzene sulfonate.

9. A method for preparing a mining inorganic phase change gel grouting material as described in any one of claims 1-8, characterized in that, Includes the following steps: Toughening agent, suspending agent, adhesive, water-reducing agent, reinforcing agent, swelling agent, speed regulator and penetration enhancer are mixed to obtain the additives; The base material and the additives are then stirred and mixed to obtain the mineral inorganic phase change gel grouting material.

10. A method of using the inorganic phase change gel grouting material for mining as described in any one of claims 1-8 or the inorganic phase change gel grouting material for mining prepared by the preparation method described in claim 9, characterized in that, Including at least one of the following methods: (i) Mix water and mineral inorganic phase change gel grouting material at a mass ratio of (0.5~2):1 to form a grouting liquid, and then use the grouting liquid for rigid sealing. (ii) Mix water and mineral inorganic phase change gel grouting material at a mass ratio of (2~4):1 to form a grouting liquid, and then use the grouting liquid for flexible sealing.

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