A grouting material for hydration heat-induced in-situ polymerization, preparation method and application thereof

Abstract

The present invention discloses a grouting material, preparation method and application of hydration heat induced in-situ polymerization. The polyaniline derivative generated by the in-situ polymerization reaction driven by hydration heat is a molecular chain, which interweaves with the gel formed by the hydration of tricalcium silicate and tricalcium aluminate to form an interconducting network structure, thereby enhancing the toughness of the grouting material. At the same time, the polyaniline derivative generated by the in-situ polymerization reaction driven by hydration heat is an amphiphilic molecule, and the phenyl group and the aromatic compound in the coal body have a π-π bond conjugation effect, while the amine group is a hydrophilic group that forms a hydrogen bond with the slurry, and this amphiphilic molecular chain plays a molecular bridge role at the coal slurry interface, thereby enhancing the bonding performance of the grouting material. In addition, the polyaniline derivative generated by the in-situ polymerization reaction driven by hydration heat can serve as a heterogeneous nucleation site for the hydration of tricalcium silicate, calcium sulfoaluminate and tricalcium aluminate, promotes its hydration hardening, and improves the mechanical strength of the grouting material.

Description

Technical Field

[0001] The invention relates to the technical field of grouting materials, and in particular to a grouting material induced by hydration heat in situ polymerization, a preparation method and an application thereof. Background Art

[0002] During coal mining, under the influence of high ground stress and strong mining, problems such as anchor bolt breakage, support component failure, and large deformation of tunnel surrounding rock occur, which seriously affect the safe production of coal mines. In response to the problem of large deformation and destruction of tunnel surrounding rock in coal mines with deep wells, soft rocks, and strong mining of soft coal bodies, researchers proposed the concept of coordinated control of tunnel support-modification-pressure relief. Modification is to achieve active modification of soft coal bodies through grouting to control the deformation of tunnel surrounding rock. In grouting modification, it is necessary to give play to the main skeleton effect of grouting materials and strengthen the interfacial bonding effect of coal slurry. Grouting materials directly determine the control effect of grouting modification on tunnel surrounding rock, and are the core of grouting modification to solve the problem of large deformation of deep coal tunnels. At present, the method of improving grouting materials is mainly through the direct addition of organic additives. This method improves the performance of grouting materials, but damages the main properties of slurry, increases the viscosity of slurry, reduces fluidity, and is difficult to inject into micro-cracked coal bodies. Therefore, it is urgent to develop new high-performance, low-viscosity grouting materials and promote their application. Summary of the invention

[0003] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0004] To this end, embodiments of the present invention provide a grouting material for hydration heat-induced in-situ polymerization, a preparation method and an application thereof.

[0005] On the one hand, the present invention provides a method for preparing a grouting material by hydration heat induced in-situ polymerization, comprising the following steps:

[0006] Preparation of material A: stirring and mixing tricalcium silicate, an aniline derivative active monomer, and a first additive in a mass ratio of (100-120):(15-20):(5-11) to obtain material A;

[0007] Preparation of material B: Calcium sulfoaluminate, tricalcium aluminate, calcium oxide, a catalyst and a second additive in a mass ratio of (50-60): (55-65): (5-10): (1-4): (4-9) are stirred and uniformly mixed to obtain material B.

[0008] In some embodiments, the aniline derivative active monomers include aniline, o-toluidine, m-toluidine, and p-toluidine in a mass ratio of 5:1:3:1.

[0009] In some embodiments, the catalyst includes hydrogen peroxide and ferric chloride in a mass ratio of 3:1.

[0010] In some embodiments, the first additive includes reinforcing molecules, toughening molecules, water-retaining molecules, and antioxidants in a mass ratio of (2-5): (1-3): (1-2): 1, and the second additive includes reinforcing molecules, toughening molecules, and solubilizing agents in a mass ratio of (2-5): (1-3): 1.

[0011] In some embodiments, the reinforcing molecules include lipoic acid and trimethylolpropane ethoxylate triacrylate in a mass ratio of 3:1, and the toughening molecules include water-soluble transition metal oxides such as molybdenum trioxide, vanadium pentoxide, and germanium dioxide in a mass ratio of 4:3:1.

[0012] In some embodiments, the water-retaining molecule includes guar gum and guar hydroxypropyltrimethylammonium chloride in a mass ratio of 1:7, and the antioxidant includes pentaerythritol tetrakis(3,5-di-tert-butyl-4-hydroxy)phenylpropionate and thiodipropionate in a mass ratio of 2:1.

[0013] In some embodiments, the dissolution promoter includes polyquaternary ammonium vinyl amide and polyethyleneimine quaternary ammonium salt in a mass ratio of 3:2.

[0014] On the other hand, the present invention proposes a grouting material for hydration heat-induced in-situ polymerization, including material A and material B, wherein the material A includes tricalcium silicate, an active monomer of an aniline derivative, and a first additive in a mass ratio of (100-120):(15-20):(5-11), and the material B includes calcium sulfoaluminate, tricalcium aluminate, calcium oxide, a catalyst, and a second additive in a mass ratio of (50-60):(55-65):(5-10):(1-4):(4-9).

[0015] In some embodiments, the first additive includes reinforcing molecules, toughening molecules, water-retaining molecules, and antioxidants in a mass ratio of (2-5): (1-3): (1-2): 1, and the second additive includes reinforcing molecules, toughening molecules, and solubilizing agents in a mass ratio of (2-5): (1-3): 1.

[0016] On the other hand, the present invention proposes an application of a grouting material induced by hydration heat in situ polymerization, and the grouting material is applied to the active modification of soft coal. During the grouting process, material A and material B are firstly stirred into slurry with water, and then mixed in equal volumes for grouting, wherein the water-cement ratio of material A and material B is 0.6-0.8.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] After the novel grouting material prepared by the present invention is added with water and stirred, hydration heat is generated due to the hydration of tricalcium silicate, calcium sulfoaluminate and tricalcium aluminate, and at the same time, the active monomer of the aniline derivative is mixed with the catalyst and starts an in-situ polymerization reaction driven by the hydration heat, thereby improving the toughness and mechanical properties of the grouting material.

[0019] The polyaniline derivative generated by the in-situ polymerization reaction driven by hydration heat is a molecular chain, which intersects and penetrates the gel formed by the hydration of tricalcium silicate and tricalcium aluminate to form an interconducting network structure, thereby enhancing the toughness of the grouting material.

[0020] The polyaniline derivative generated by the in-situ polymerization reaction driven by hydration heat is an amphiphilic molecule. The phenyl group has a π-π bond conjugation effect with the aromatic compound in the coal body, and the amine group is a hydrophilic group that forms a hydrogen bond with the slurry. The amphiphilic molecular chain acts as a molecular bridge at the coal slurry interface, thereby enhancing the bonding performance of the grouting material.

[0021] The polyaniline derivatives generated by the in-situ polymerization reaction driven by hydration heat can serve as heterogeneous nucleation sites for the hydration of tricalcium silicate, calcium sulfoaluminate and tricalcium aluminate, promote their hydration hardening and improve the mechanical strength of the grouting material. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0023] Figure 1 This is a flow chart of the preparation method of the grouting material of the present invention through hydration heat induced in-situ polymerization;

[0024] Figure 2 This is a diagram of the preparation process of material A of the present invention;

[0025] Figure 3 This is a diagram of the preparation process of material B of the present invention;

[0026] Figure 4 It is a diagram of the preparation process of the grouting material of the present invention. DETAILED DESCRIPTION

[0027] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0028] The following describes the grouting material, preparation method and application of the hydration heat induced in-situ polymerization proposed in accordance with the embodiments of the present invention with reference to the accompanying drawings.

[0029] like Figure 1-4As shown, the preparation method of the grouting material of the present invention by hydration heat induced in-situ polymerization comprises the following steps:

[0030] Preparation of material A: stirring and mixing tricalcium silicate, an aniline derivative active monomer, and a first additive in a mass ratio of (100-120):(15-20):(5-11) to obtain material A;

[0031] Preparation of material B: Calcium sulfoaluminate, tricalcium aluminate, calcium oxide, a catalyst and a second additive in a mass ratio of (50-60): (55-65): (5-10): (1-4): (4-9) are stirred and uniformly mixed to obtain material B.

[0032] The active monomers of the aniline derivatives include aniline, o-toluidine, m-toluidine and p-toluidine in a mass ratio of 5:1:3:1, and the catalyst includes hydrogen peroxide and ferric chloride in a mass ratio of 3:1.

[0033] The first additive includes reinforcing molecules, toughening molecules, water-retaining molecules, and antioxidants in a mass ratio of (2-5): (1-3): (1-2): 1, and the second additive includes reinforcing molecules, toughening molecules, and dissolution promoters in a mass ratio of (2-5): (1-3): 1. The reinforcing molecules include lipoic acid and trimethylol propane ethoxylate triacrylate in a mass ratio of 3:1, the toughening molecules include water-soluble transition metal oxides such as molybdenum trioxide, vanadium pentoxide, and germanium dioxide in a mass ratio of 4:3:1, the water-retaining molecules include guar gum and guar gum hydroxypropyltrimethylammonium chloride in a mass ratio of 1:7, the antioxidant includes pentaerythritol tetrakis(3,5-di-tert-butyl-4-hydroxy)phenylpropionic acid ester and thiodipropionic acid ester in a mass ratio of 2:1, and the dissolution promoter includes polyquaternary ammonium vinylamide and polyethyleneimine quaternary ammonium salt in a mass ratio of 3:2.

[0034] The grouting material is prepared by the preparation method of the grouting material of the hydration heat induced in-situ polymerization of the present invention, and the grouting material includes material A and material B, wherein the material A includes tricalcium silicate, aniline derivative active monomer, and a first additive in a mass ratio of (100-120):(15-20):(5-11), and the material B includes calcium sulfoaluminate, tricalcium aluminate, calcium oxide, a catalyst, and a second additive in a mass ratio of (50-60):(55-65):(5-10):(1-4):(4-9), the first additive includes reinforcing molecules, toughening molecules, water-retaining molecules, and antioxidants in a mass ratio of (2-5):(1-3):(1-2):1, and the second additive includes reinforcing molecules, toughening molecules, and a dissolving agent in a mass ratio of (2-5):(1-3):1.

[0035] The grouting material of the present invention is applied to active modification of soft coal. During the grouting process, material A and material B are firstly stirred into slurry with water, and then mixed in equal volumes for grouting, wherein the water-cement ratio of material A and material B is 0.6-0.8.

[0036] After the grouting material is added with water and stirred, the hydration of tricalcium silicate, calcium sulfoaluminate and tricalcium aluminate generates hydration heat. At the same time, the active monomer of the aniline derivative is mixed with the catalyst and starts an in-situ polymerization reaction driven by the hydration heat, thereby improving the toughness and mechanical properties of the grouting material.

[0037] The polyaniline derivative generated by the in-situ polymerization reaction driven by the hydration heat of the present invention is a molecular chain, which intersects and penetrates with the gel formed by the hydration of tricalcium silicate and tricalcium aluminate to form an interconductive network structure, thereby enhancing the toughness of the grouting material. At the same time, the polyaniline derivative generated by the in-situ polymerization reaction driven by the hydration heat is an amphiphilic molecule, and the phenyl group and the aromatic compound in the coal body have a π-π bond conjugation effect, and the amine group is a hydrophilic group that forms a hydrogen bond with the slurry. This amphiphilic molecular chain acts as a molecular bridge at the coal slurry interface, thereby enhancing the bonding performance of the grouting material. In addition, the polyaniline derivative generated by the in-situ polymerization reaction driven by the hydration heat can serve as a heterogeneous nucleation site for the hydration of tricalcium silicate, calcium sulfoaluminate, and tricalcium aluminate, promotes their hydration hardening, and improves the mechanical strength of the grouting material.

[0038] Example 1

[0039] 125 kg of aniline, 25 kg of o-toluidine, 75 kg of m-toluidine and 25 kg of p-toluidine were weighed respectively, and mixed to obtain active monomers of aniline derivatives for use.

[0040] Weigh 30 kg of hydrogen peroxide and 10 kg of ferric chloride respectively, mix them to obtain a catalyst for use.

[0041] Weigh 60 kg of lipoic acid and 20 kg of trimethylol propane ethoxylate triacrylate respectively, mix them to obtain the reinforcing molecule for later use.

[0042] Weigh 40 kg of molybdenum trioxide, 30 kg of vanadium pentoxide, and 10 kg of germanium dioxide respectively, mix them to obtain toughening molecules for later use.

[0043] Weigh 5 kg of guar gum and 35 kg of guar gum hydroxypropyltrimethylammonium chloride respectively, mix them to obtain water-retaining molecules for later use.

[0044] 10 kg of pentaerythritol tetrakis(3,5-di-tert-butyl-4-hydroxy)phenylpropionate and 5 kg of thiodipropionate were weighed respectively, and mixed to obtain an antioxidant for later use.

[0045] Weigh 15 kg of polyquaternary ammonium vinyl amide and 10 kg of polyethyleneimine quaternary ammonium salt respectively, mix them to obtain a dissolving agent for use.

[0046] Example 2

[0047] Prepare 120 kg of material A: weigh 100 kg of tricalcium silicate, 15 kg of aniline derivative active monomer, 2 kg of reinforcing molecules, 1 kg of toughening molecules, 1 kg of water-retaining molecules, and 1 kg of antioxidant, and mix them evenly in a dry powder mixer at 20° C. for 45 minutes to obtain grouting material A;

[0048] Prepare 115 kg of material B: weigh 50 kg of calcium sulfoaluminate, 55 kg of tricalcium aluminate, 5 kg of calcium oxide, 1 kg of catalyst, 2 kg of reinforcing molecules, 1 kg of toughening molecules, and 1 kg of solvent respectively, and stir in a dry powder mixer at 20°C for 60 minutes to mix evenly to obtain grouting material B;

[0049] Add water to material A and material B and stir them into slurry, then mix them in equal volumes for grouting, wherein the water-cement ratio of material A and material B is 0.6.

[0050] Referring to the national standards GB / T29756-2013 and GB / T17671-2021, the slurry bonding strength, compressive strength and flexural strength were tested, and the slurry was prepared into test blocks of 40mm×40mm×160mm. The compressive strength of the grouting material was 55.9MPa, the flexural strength was 12.4MPa, and the bonding strength was 2.5MPa.

[0051] Example 3

[0052] Prepare 133 kg of material A: weigh 112 kg of tricalcium silicate, 16 kg of aniline derivative active monomer, 2 kg of reinforcing molecules, 1 kg of toughening molecules, 1 kg of water-retaining molecules, and 1 kg of antioxidant, and mix them evenly in a dry powder mixer at 20° C. for 45 minutes to obtain grouting material A;

[0053] Prepare 118.5 kg of material B: weigh 52 kg of calcium sulfoaluminate, 56 kg of tricalcium aluminate, 5.5 kg of calcium oxide, 1 kg of catalyst, 2 kg of reinforcing molecules, 1 kg of toughening molecules, and 1 kg of solvent respectively, and stir in a dry powder mixer at 20°C for 60 minutes to mix evenly to obtain grouting material B;

[0054] Add water to material A and material B and stir them into slurry, then mix them in equal volumes for grouting, wherein the water-cement ratio of material A and material B is 0.6.

[0055] Referring to the national standards GB / T29756-2013 and GB / T17671-2021, the slurry bonding strength, compressive strength and flexural strength were tested, and the slurry was prepared into test blocks of 40mm×40mm×160mm. The compressive strength of the grouting material was 57.2MPa, the flexural strength was 12.7MPa, and the bonding strength was 2.6MPa.

[0056] Example 4

[0057] Prepare 136.5 kg of material A: weigh 113 kg of tricalcium silicate, 17 kg of aniline derivative active monomer, 2.5 kg of reinforcing molecules, 1.5 kg of toughening molecules, 1.5 kg of water-retaining molecules, and 1 kg of antioxidant, respectively, and stir in a dry powder mixer at 20° C. for 45 minutes to mix evenly to obtain grouting material A;

[0058] Prepare 123 kg of material B: weigh 53 kg of calcium sulfoaluminate, 57 kg of tricalcium aluminate, 6 kg of calcium oxide, 1.5 kg of catalyst, 2.5 kg of reinforcing molecules, 2 kg of toughening molecules, and 1 kg of solvent respectively, and stir in a dry powder mixer at 20°C for 60 minutes to mix evenly to obtain grouting material B;

[0059] Add water to material A and material B and stir them into slurry, then mix them in equal volumes for grouting, wherein the water-cement ratio of material A and material B is 0.6.

[0060] Referring to the national standards GB / T29756-2013 and GB / T17671-2021, the slurry bonding strength, compressive strength and flexural strength were tested, and the slurry was prepared into test blocks of 40mm×40mm×160mm. The compressive strength of the grouting material was 59.3MPa, the flexural strength was 13.1MPa, and the bonding strength was 2.7MPa.

[0061] Example 5

[0062] Prepare 138 kg of material A: weigh 114 kg of tricalcium silicate, 17 kg of aniline derivative active monomer, 2.5 kg of reinforcing molecules, 2 kg of toughening molecules, 1.5 kg of water-retaining molecules, and 1 kg of antioxidant, respectively, and stir in a dry powder mixer at 20° C. for 45 minutes to mix evenly to obtain grouting material A;

[0063] Prepare 124 kg of material B: weigh 54 kg of calcium sulfoaluminate, 57 kg of tricalcium aluminate, 6 kg of calcium oxide, 1.5 kg of catalyst, 2.5 kg of reinforcing molecules, 2 kg of toughening molecules, and 1 kg of solvent respectively, and stir in a dry powder mixer at 20°C for 60 minutes to mix evenly to obtain grouting material B;

[0064] Add water to material A and material B and stir them into slurry, then mix them in equal volumes for grouting, wherein the water-cement ratio of material A and material B is 0.7.

[0065] Referring to the national standards GB / T29756-2013 and GB / T17671-2021, the slurry bonding strength, compressive strength and flexural strength were tested, and the slurry was prepared into 40mm×40mm×160mm test blocks. The compressive strength of the grouting material was 63.7MPa, the flexural strength was 13.7MPa, and the bonding strength was 2.8MPa.

[0066] Example 6

[0067] Prepare 140.5 kg of material A: weigh 115 kg of tricalcium silicate, 18 kg of aniline derivative active monomer, 3 kg of reinforcing molecules, 2 kg of toughening molecules, 1.5 kg of water-retaining molecules, and 1 kg of antioxidant, respectively, and stir in a dry powder mixer at 20° C. for 45 minutes to mix evenly to obtain grouting material A;

[0068] Prepare 129.5 kg of material B: weigh 55 kg of calcium sulfoaluminate, 60 kg of tricalcium aluminate, 7 kg of calcium oxide, 2 kg of catalyst, 2.5 kg of reinforcing molecules, 2 kg of toughening molecules, and 1 kg of solvent respectively, stir in a dry powder mixer at 20°C for 60 minutes to mix evenly, and obtain grouting material B;

[0069] Add water to material A and material B and stir them into slurry, then mix them in equal volumes for grouting, wherein the water-cement ratio of material A and material B is 0.7.

[0070] Referring to the national standards GB / T29756-2013 and GB / T17671-2021, the slurry bonding strength, compressive strength and flexural strength were tested, and the slurry was prepared into 40mm×40mm×160mm test blocks. The compressive strength of the grouting material was 65.2MPa, the flexural strength was 14.1MPa, and the bonding strength was 2.9MPa.

[0071] Example 7

[0072] Prepare 141.5 kg of material A: weigh 116 kg of tricalcium silicate, 18 kg of aniline derivative active monomer, 3 kg of reinforcing molecules, 2 kg of toughening molecules, 1.5 kg of water-retaining molecules, and 1 kg of antioxidant, respectively, and stir in a dry powder mixer at 20° C. for 45 minutes to mix evenly to obtain grouting material A;

[0073] Prepare 133.5 kg of material B: weigh 56 kg of calcium sulfoaluminate, 61 kg of tricalcium aluminate, 8 kg of calcium oxide, 2.5 kg of catalyst, 3 kg of reinforcing molecules, 2 kg of toughening molecules, and 1 kg of solvent respectively, stir in a dry powder mixer at 20°C for 60 minutes to mix evenly, and obtain grouting material B;

[0074] Add water to material A and material B and stir them into slurry, then mix them in equal volumes for grouting, wherein the water-cement ratio of material A and material B is 0.7.

[0075] Referring to the national standards GB / T29756-2013 and GB / T17671-2021, the slurry bonding strength, compressive strength and flexural strength were tested, and the slurry was prepared into test blocks of 40mm×40mm×160mm. The compressive strength of the grouting material was 69.4MPa, the flexural strength was 14.5MPa, and the bonding strength was 3.0MPa.

[0076] Example 8

[0077] Prepare 145.5 kg of material A: weigh 117 kg of tricalcium silicate, 19 kg of aniline derivative active monomer, 4 kg of reinforcing molecules, 2.5 kg of toughening molecules, 2 kg of water-retaining molecules, and 1 kg of antioxidant, and mix them evenly in a dry powder mixer at 20° C. for 45 minutes to obtain grouting material A;

[0078] Prepare 139 kg of material B: weigh 57 kg of calcium sulfoaluminate, 63 kg of tricalcium aluminate, 9 kg of calcium oxide, 3 kg of catalyst, 3 kg of reinforcing molecules, 3 kg of toughening molecules, and 1 kg of solvent respectively, and stir in a dry powder mixer at 20°C for 60 minutes to mix evenly to obtain grouting material B;

[0079] Add water to material A and material B and stir them into slurry, then mix them in equal volumes for grouting, wherein the water-cement ratio of material A and material B is 0.8.

[0080] Referring to the national standards GB / T29756-2013 and GB / T17671-2021, the slurry bonding strength, compressive strength and flexural strength were tested, and the slurry was prepared into 40mm×40mm×160mm test blocks. The compressive strength of the grouting material was 71.8MPa, the flexural strength was 14.7MPa, and the bonding strength was 3.1MPa.

[0081] Example 9

[0082] Prepare 147 kg of material A: weigh 118 kg of tricalcium silicate, 19 kg of aniline derivative active monomer, 4 kg of reinforcing molecules, 3 kg of toughening molecules, 2 kg of water-retaining molecules, and 1 kg of antioxidant, and mix them evenly in a dry powder mixer at 20° C. for 45 minutes to obtain grouting material A;

[0083] Prepare 142.5 kg of material B: weigh 58 kg of calcium sulfoaluminate, 64 kg of tricalcium aluminate, 9 kg of calcium oxide, 3.5 kg of catalyst, 4 kg of reinforcing molecules, 3 kg of toughening molecules, and 1 kg of solvent respectively, and stir in a dry powder mixer at 20°C for 60 minutes to mix evenly to obtain grouting material B;

[0084] Add water to material A and material B and stir them into slurry, then mix them in equal volumes for grouting, wherein the water-cement ratio of material A and material B is 0.8.

[0085] Referring to the national standards GB / T29756-2013 and GB / T17671-2021, the slurry bonding strength, compressive strength and flexural strength were tested, and the slurry was prepared into 40mm×40mm×160mm test blocks. The compressive strength of the grouting material was 74.2MPa, the flexural strength was 14.9MPa, and the bonding strength was 3.2MPa.

[0086] Example 10

[0087] Prepare 151 kg of material A: weigh 120 kg of tricalcium silicate, 20 kg of aniline derivative active monomer, 5 kg of reinforcing molecules, 3 kg of toughening molecules, 2 kg of water-retaining molecules, and 1 kg of antioxidant, respectively, and mix them evenly in a dry powder mixer at 20° C. for 45 minutes to obtain grouting material A;

[0088] Prepare 148 kg of material B: weigh 60 kg of calcium sulfoaluminate, 65 kg of tricalcium aluminate, 10 kg of calcium oxide, 4 kg of catalyst, 5 kg of reinforcing molecules, 3 kg of toughening molecules, and 1 kg of solvent respectively, and stir in a dry powder mixer at 20°C for 60 minutes to mix evenly to obtain grouting material B;

[0089] Add water to material A and material B and stir them into slurry, then mix them in equal volumes for grouting, wherein the water-cement ratio of material A and material B is 0.8.

[0090] Referring to the national standards GB / T29756-2013 and GB / T17671-2021, the slurry bonding strength, compressive strength and flexural strength were tested, and the slurry was prepared into 40mm×40mm×160mm test blocks. The compressive strength of the grouting material was 77.9MPa, the flexural strength was 15.0MPa, and the bonding strength was 3.3MPa.

[0091] Comparative Example 1

[0092] Prepare 106 kg of material A: weigh 100 kg of tricalcium silicate, 1 kg of aniline derivative active monomer, 2 kg of reinforcing molecules, 1 kg of toughening molecules, 1 kg of water-retaining molecules, and 1 kg of antioxidant, and mix them evenly in a dry powder mixer at 20° C. for 45 minutes to obtain grouting material A;

[0093] Prepare 115 kg of material B: weigh 50 kg of calcium sulfoaluminate, 55 kg of tricalcium aluminate, 5 kg of calcium oxide, 1 kg of catalyst, 2 kg of reinforcing molecules, 1 kg of toughening molecules, and 1 kg of solvent respectively, and stir in a dry powder mixer at 20°C for 60 minutes to mix evenly to obtain grouting material B;

[0094] Add water to material A and material B and stir them into slurry, then mix them in equal volumes for grouting, wherein the water-cement ratio of material A and material B is 0.8.

[0095] Referring to the national standards GB / T29756-2013 and GB / T17671-2021, the slurry bonding strength, compressive strength and flexural strength were tested, and the slurry was prepared into test blocks of 40mm×40mm×160mm. The compressive strength of the grouting material was 40.2MPa, the flexural strength was 8.1MPa, and the bonding strength was 1.6MPa.

[0096] Comparative Example 2

[0097] Prepare 151 kg of material A: weigh 120 kg of tricalcium silicate, 20 kg of aniline derivative active monomer, 5 kg of reinforcing molecules, 3 kg of toughening molecules, 2 kg of water-retaining molecules, and 1 kg of antioxidant, respectively, and mix them evenly in a dry powder mixer at 20° C. for 45 minutes to obtain grouting material A;

[0098] Prepare 144 kg of material B: weigh 60 kg of calcium sulfoaluminate, 65 kg of tricalcium aluminate, 10 kg of calcium oxide, 5 kg of reinforcing molecules, 3 kg of toughening molecules, and 1 kg of solvent respectively, and stir in a dry powder mixer at 20°C for 60 minutes to mix evenly to obtain grouting material B;

[0099] Add water to material A and material B and stir them into slurry, then mix them in equal volumes for grouting, wherein the water-cement ratio of material A and material B is 0.8.

[0100] Referring to the national standards GB / T29756-2013 and GB / T17671-2021, the slurry bonding strength, compressive strength and flexural strength were tested, and the slurry was prepared into test blocks of 40mm×40mm×160mm. The compressive strength of the grouting material was 30.5MPa, the flexural strength was 6.3MPa, and the bonding strength was 0.9MPa.

[0101] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms may be for different embodiments or examples. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0102] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0103] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A method for preparing a grouting material by hydration heat-induced in-situ polymerization, characterized in that: The following steps are involved: Preparation of material A: stirring and mixing tricalcium silicate, an aniline derivative active monomer, and a first additive in a mass ratio of (100-120): (15-20): (5-11) to obtain material A; Preparation of material B: Calcium sulfoaluminate, tricalcium aluminate, calcium oxide, a catalyst, and a second additive in a mass ratio of (50-60): (55-65): (5-10): (1-4): (4-9) are stirred and mixed to obtain material B. The aniline derivative active monomers include aniline, o-toluidine, m-toluidine, and p-toluidine in a mass ratio of 5:1:3:1; the catalyst includes hydrogen peroxide and ferric chloride in a mass ratio of 3:1; the first additive includes reinforcing molecules, toughening molecules, water-retaining molecules, and antioxidants in a mass ratio of (2-5):(1-3):(1-2):1; and the second additive includes reinforcing molecules, toughening molecules, and a solubilizing agent in a mass ratio of (2-5):(1-3):

1.

2. The preparation method according to claim 1, characterized in that The reinforcing molecules include lipoic acid and trimethylol propane ethoxylate triacrylate in a mass ratio of 3:1, and the toughening molecules include water-soluble transition metal oxides such as molybdenum trioxide, vanadium pentoxide and germanium dioxide in a mass ratio of 4:3:

1.

3. The preparation method according to claim 1, characterized in that: The water-retaining molecules include guar gum and guar gum hydroxypropyltrimethylammonium chloride in a mass ratio of 1:7, and the antioxidants include pentaerythritol tetrakis(3,5-di-tert-butyl-4-hydroxy)phenylpropionate and thiodipropionate in a mass ratio of 2:

1.

4. The preparation method according to claim 1, characterized in that: The dissolution promoter comprises polyquaternary ammonium vinyl amide and polyethyleneimine quaternary ammonium salt in a mass ratio of 3:

2.

5. A grouting material for in-situ polymerization induced by hydration heat, characterized in that: The grouting material is prepared by the method described in any one of claims 1 to 4, and the grouting material includes material A and material B, wherein the material A includes tricalcium silicate, an active monomer of an aniline derivative, and a first additive in a mass ratio of (100-120):(15-20):(5-11), and the material B includes calcium sulfoaluminate, tricalcium aluminate, calcium oxide, a catalyst, and a second additive in a mass ratio of (50-60):(55-65):(5-10):(1-4):(4-9).

6. Application of a grouting material induced by hydration heat in situ polymerization, characterized in that: The grouting material is prepared by the method described in any one of claims 1 to 4, and the grouting material is used in the active modification of soft coal. During the grouting process, material A and material B are firstly stirred into slurry with water, and then mixed in equal volumes for grouting, wherein the water-cement ratio of material A and material B is 0.6-0.8.

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