A polymer bentonite composite anti-seepage material and preparation method thereof

Abstract

The invention discloses a polymer bentonite composite anti-seepage material, relating to the technical field of anti-seepage materials, comprising the following raw materials by weight: 3-5 parts of bentonite, 0.2-0.4 parts of amphoteric organic ion salt monomers, 0.1-0.2 parts of a cross-linking agent, 0.05-0.1 parts of a cage-type silsesquioxane containing vinyl and epoxy groups, 0.06-0.12 parts of a reactive beta-cyclodextrin quaternary ammonium salt, 0.05-0.1 parts of an alkoxy-containing monomer, 0.5-0.8 parts of volcanic ash, 0.1-0.3 parts of nanofibers, 0.05-0.08 parts of sodium tripolyphosphate, 0.005-0.01 parts of an initiator, 0.01-0.03 parts of 2,3-quinolinedicarboxylic acid, and 10-20 parts of water. The material has significant anti-seepage effect, good resistance to dry-wet cycles, good acid, alkali, and salt resistance, sufficient performance stability, and long service life.

Description

Technical Field

[0001] The present invention relates to the technical field of anti-seepage, and in particular to a polymer bentonite composite anti-seepage material and a preparation method thereof. Background Art

[0002] Anti-seepage materials are commonly used in industrial and civil structures such as industrial slag ponds, heavy metal tailings ponds, industrial plants, tank farms, contaminated sites, rivers and ponds, reservoirs, and dams. They prevent the intrusion of liquid substances (such as water) or gaseous substances (such as water vapor) into the protective structure, providing reliable and long-term protection for groundwater, air, and soil. The performance of anti-seepage materials directly affects the effectiveness of protection. Therefore, the development of anti-seepage materials with excellent comprehensive performance and performance stability is imperative.

[0003] At present, anti-seepage materials mainly include natural clay, HDPE anti-seepage membrane and modified anti-seepage materials. However, the permeability coefficient of most natural clays does not meet the regulatory requirements, the self-healing performance is poor, the anti-seepage effect is difficult to guarantee, and the amount of high-quality natural clay is limited. HDPE anti-seepage membrane is expensive and not suitable for large-scale promotion. Polymer bentonite composite anti-seepage material is a typical representative of modified anti-seepage materials. It uses the larger molecular chain structure of the polymer to expand the interlayer spacing of bentonite and fill the pores between bentonite particles, effectively improving the anti-seepage performance of bentonite in corrosive environments such as high salt, strong acid, and strong alkali. The raw materials are abundant and easy to obtain, and the preparation is simple. However, the existing polymer bentonite composite anti-seepage materials have problems such as polymer chain breakage, polymer dissolution and separation from the bentonite bound to it under the action of dry-wet cycles in corrosive environments, which deteriorate their performance.

[0004] To address these issues, Chinese invention patent application CN108793838A discloses a new mineral barrier and anti-seepage material based on tailings sand. Its formulation consists of 70-90% tailings sand, 5-10% bentonite, 0.1-1% polymer, and 10-20% water. Tailings sand and bentonite are used in significant quantities, and while 70-90 mm of this material can replace a 5-m clay barrier layer, it still suffers from poor acid and alkali resistance.

[0005] It can be seen that the present invention still needs a polymer bentonite composite anti-seepage material with significant anti-seepage effect, good resistance to dry-wet cycles, good acid, alkali and salt resistance, sufficient performance stability and long service life, and a preparation method thereof. Summary of the Invention

[0006] The main purpose of the present invention is to provide a polymer bentonite composite anti-seepage material with significant anti-seepage effect, good resistance to dry-wet cycles, excellent acid, alkali and salt resistance, sufficient performance stability and long service life, and a preparation method thereof.

[0007] To achieve the above objectives, the present invention provides a polymer bentonite composite anti-seepage material, which comprises the following raw materials in parts by weight: 3-5 parts of bentonite, 0.2-0.4 parts of amphoteric organic ion salt monomers, 0.1-0.2 parts of a crosslinking agent, 0.05-0.1 parts of a cage-type silsesquioxane containing vinyl and epoxy groups, 0.06-0.12 parts of a reactive β-cyclodextrin quaternary ammonium salt, 0.05-0.1 parts of an alkoxy-containing monomer, 0.5-0.8 parts of volcanic ash, 0.1-0.3 parts of nanofibers, 0.05-0.08 parts of sodium tripolyphosphate, 0.005-0.01 parts of an initiator, 0.01-0.03 parts of 2,3-quinolinedicarboxylic acid, and 10-20 parts of water.

[0008] Preferably, the initiator is at least one of ammonium persulfate, potassium persulfate, and sodium persulfate.

[0009] Preferably, the nanofibers are graphene oxide nanofibers with an average diameter of 30-100 nm and a length of 5-10 μm.

[0010] Preferably, the particle size of the volcanic ash is 800-1200 mesh.

[0011] Preferably, the alkoxy-containing monomer is at least one of vinyltrimethoxysilane and methacryloxypropyltriethoxysilane.

[0012] Preferably, the reactive β-cyclodextrin quaternary ammonium salt is a β-cyclodextrin quaternary ammonium salt containing a polymerizable unsaturated olefinic bond, and there is no special requirement for its source. In one embodiment of the present invention, the reactive β-cyclodextrin quaternary ammonium salt is prepared according to the method of Example 6 of Chinese invention patent application number 201610596491.X.

[0013] Preferably, there is no special requirement for the source of the vinyl- and epoxy-containing cage silsesquioxane. In one embodiment of the present invention, the vinyl- and epoxy-containing cage silsesquioxane is prepared according to the method of Example 1 of Chinese Invention Patent Application No. 200910081260.5.

[0014] Preferably, the cross-linking agent is a mixture of 2,4-diamino-6-diallylamino-1,3,5-triazine, bis(1-vinyl imidazole-2-) ketone, 2,4,6-trivinyl cycloboroxine, and 3,9-divinyl-2,4,8,10-tetraoxaspiro[5.5]undecane in a mass ratio of (3-5):(0.5-0.8):(0.1-0.3):1.

[0015] Preferably, the amphoteric organic ion salt monomer is 3-[N,N-dimethyl-[2-(2-methylprop-2-enoyloxy)ethyl]ammonium]propane-1-sulfonic acid inner salt.

[0016] Preferably, the bentonite is at least one of calcium-based bentonite, sodium-based bentonite and sodium-calcium-based bentonite.

[0017] Preferably, the bentonite has a particle size of 200-500 mesh.

[0018] Another object of the present invention is to provide a method for preparing the polymer bentonite composite anti-seepage material, comprising the following steps: mixing the raw materials uniformly by weight, stirring and reacting at 65-80°C for 3-5 hours, filtering, drying to constant weight at 85-105°C, grinding, and passing through a 150-300 mesh sieve to obtain the polymer bentonite composite anti-seepage material.

[0019] Due to the application of the above technical solution, the present invention has the following beneficial effects:

[0020] (1) The preparation method of the polymer bentonite composite anti-seepage material disclosed in the present invention has simple process, convenient operation, low labor intensity and energy consumption, small dependence on equipment and environmental impact, is suitable for industrial continuous production, and has high promotion and application value.

[0021] (2) The polymer bentonite composite anti-seepage material disclosed in the present invention is made of the following raw materials in parts by weight: 3-5 parts of bentonite, 0.2-0.4 parts of amphoteric organic ion salt monomer, 0.1-0.2 parts of a crosslinking agent, 0.05-0.1 parts of a cage-type silsesquioxane containing vinyl and epoxy groups, 0.06-0.12 parts of a reactive β-cyclodextrin quaternary ammonium salt, 0.05-0.1 parts of an alkoxy-containing monomer, 0.5-0.8 parts of volcanic ash, 0.1-0.3 parts of nanofibers, 0.05-0.08 parts of sodium tripolyphosphate, 0.005-0.01 parts of an initiator, 0.01-0.03 parts of 2,3-quinolinedicarboxylic acid, and 10-20 parts of water. Through the mutual cooperation and joint action of the raw materials, the anti-seepage material has a significant anti-seepage effect, good resistance to dry-wet cycles, good acid, alkali and salt resistance, sufficient performance stability, and a long service life.

[0022] (3) The polymer bentonite composite anti-seepage material disclosed in the present invention forms a protective film on the surface of bentonite that can block the contact between multivalent metal ions in the solution and bentonite through the reasonable selection of monomer types and ratios. The protective film contains hydrophilic amphoteric organic ion salt structures, hydroxyl groups and other hydrophilic structures in the molecular structure, which can effectively enhance the water absorption and expansion effect of the material, maintain the thickness of the compressed double layer, block the pore channels, prevent the flow of water, and thus improve the anti-seepage performance.

[0023] (4) The polymer bentonite composite anti-seepage material disclosed in the present invention introduces an amphoteric organic ion salt structure, which works synergistically with other structures to enhance viscosity and adsorption, improve anti-seepage and salt resistance, and the introduced alkoxy structure can react chemically with the hydroxyl groups on the surface of bentonite and volcanic ash to improve the chemical compatibility of bentonite; the introduction of cyclodextrin quaternary ammonium salt structure and cage-type silsesquioxane structure, which works synergistically with other structures to improve anti-seepage performance and performance stability; the introduction of volcanic ash and nanofiber structure can further improve the mechanical strength and anti-seepage performance of the material, and the nanofiber uses graphene oxide fiber, which can improve the compatibility between the raw materials and improve the anti-seepage material. The crosslinking agent is a mixture of 2,4-diamino-6-diallylamino-1,3,5-triazine, bis(1-vinylimidazol-2-one), 2,4,6-trivinylboroxine, and 3,9-divinyl-2,4,8,10-tetraoxaspiro[5.5]undecane in a mass ratio of (3-5):(0.5-0.8):(0.1-0.3):1. The triazine, imidazolone, boroxine, tetraoxaspiroane, and quinoline structures introduced simultaneously improve the material's anti-seepage performance, resistance to dry-wet cycles, and acid, alkali, and salt resistance through the multiple effects of electronic, steric, and conjugated effects. Sodium tripolyphosphate can improve the dispersibility of the raw materials, enhance adhesion, and improve anti-seepage performance and performance stability.

[0024] (5) The polymer bentonite composite anti-seepage material disclosed in the present invention has a monomer containing an unsaturated olefinic bond that undergoes a polymerization reaction under the action of an initiator. The epoxy group on the cage-type silsesquioxane containing vinyl and epoxy groups can also undergo an epoxy ring-opening reaction with the amino group on 2,4-diamino-6-diallylamino-1,3,5-triazine to form an interpenetrating network structure. The formed polymer intercalates and grafts the montmorillonite mineral in the bentonite, effectively reducing the breakage of the bonding bond between the polymer and montmorillonite under the action of dry-wet cycles and reducing the dissolution amount of the polymer. As a result, the anti-seepage effect, dry-wet cycle resistance, and acid, alkali and salt resistance of the prepared anti-seepage material are better, and the service life is longer. DETAILED DESCRIPTION

[0025] The following description is intended to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are merely examples, and those skilled in the art may conceive of other obvious variations. Example 1

[0026] A polymer bentonite composite anti-seepage material is prepared from the following raw materials in parts by weight: 3 parts of bentonite, 0.2 parts of amphoteric organic ion salt monomers, 0.1 parts of a crosslinking agent, 0.05 parts of a cage-type silsesquioxane containing vinyl and epoxy groups, 0.06 parts of a reactive β-cyclodextrin quaternary ammonium salt, 0.05 parts of an alkoxy-containing monomer, 0.5 parts of volcanic ash, 0.1 parts of nanofibers, 0.05 parts of sodium tripolyphosphate, 0.005 parts of an initiator, 0.01 parts of 2,3-quinolinedicarboxylic acid, and 10 parts of water.

[0027] The initiator is ammonium persulfate; the nanofibers are graphene oxide nanofibers with an average diameter of 30 nm and a length of 5 μm; the particle size of the volcanic ash is 800 mesh; and the alkoxy-containing monomer is vinyltrimethoxysilane.

[0028] The reactive β-cyclodextrin quaternary ammonium salt is prepared according to the method of Example 6 of the Chinese invention patent application number 201610596491.X; the cage-type silsesquioxane containing vinyl and epoxy groups is prepared according to the method of Example 1 of the Chinese invention patent application number 200910081260.5.

[0029] The cross-linking agent is a mixture of 2,4-diamino-6-diallylamino-1,3,5-triazine, bis(1-vinyl imidazole-2-) ketone, 2,4,6-trivinyl cycloboroxine, and 3,9-divinyl-2,4,8,10-tetraoxaspiro[5.5]undecane in a mass ratio of 3:0.5:0.1:1; the amphoteric organic ion salt monomer is 3-[N,N-dimethyl-[2-(2-methylprop-2-enoyloxy)ethyl]ammonium]propane-1-sulfonic acid inner salt; the bentonite is calcium-based bentonite; and the particle size of the bentonite is 200 mesh.

[0030] A preparation method of the polymer bentonite composite anti-seepage material comprises the following steps: uniformly mixing the raw materials according to parts by weight, stirring and reacting at 65°C for 3 hours, filtering, drying at 85°C to constant weight, grinding and passing through a 150-mesh sieve to obtain the polymer bentonite composite anti-seepage material. Example 2

[0031] A polymer bentonite composite anti-seepage material is prepared from the following raw materials in parts by weight: 3.5 parts of bentonite, 0.25 parts of amphoteric organic ion salt monomers, 0.12 parts of a crosslinking agent, 0.06 parts of a cage-type silsesquioxane containing vinyl and epoxy groups, 0.08 parts of a reactive β-cyclodextrin quaternary ammonium salt, 0.06 parts of an alkoxy-containing monomer, 0.6 parts of volcanic ash, 0.15 parts of nanofibers, 0.06 parts of sodium tripolyphosphate, 0.006 parts of an initiator, 0.015 parts of 2,3-quinolinedicarboxylic acid, and 13 parts of water.

[0032] The initiator is potassium persulfate; the nanofibers are graphene oxide nanofibers with an average diameter of 50 nm and a length of 6 μm; the particle size of the volcanic ash is 900 mesh; and the alkoxy-containing monomer is methacryloxypropyltriethoxysilane.

[0033] The reactive β-cyclodextrin quaternary ammonium salt is prepared according to the method of Example 6 of the Chinese invention patent application number 201610596491.X; the cage-type silsesquioxane containing vinyl and epoxy groups is prepared according to the method of Example 1 of the Chinese invention patent application number 200910081260.5.

[0034] The cross-linking agent is a mixture of 2,4-diamino-6-diallylamino-1,3,5-triazine, bis(1-vinyl imidazole-2-) ketone, 2,4,6-trivinyl cycloboroxine, and 3,9-divinyl-2,4,8,10-tetraoxaspiro[5.5]undecane in a mass ratio of 3.5:0.6:0.15:1; the amphoteric organic ion salt monomer is 3-[N,N-dimethyl-[2-(2-methylprop-2-enoyloxy)ethyl]ammonium]propane-1-sulfonic acid inner salt; the bentonite is sodium bentonite; and the particle size of the bentonite is 300 mesh.

[0035] A preparation method of the polymer bentonite composite anti-seepage material comprises the following steps: uniformly mixing the raw materials according to parts by weight, stirring and reacting at 70°C for 3.5 hours, filtering, drying at 90°C to constant weight, grinding and passing through a 190-mesh sieve to obtain the polymer bentonite composite anti-seepage material. Example 3

[0036] A polymer bentonite composite anti-seepage material is prepared from the following raw materials in parts by weight: 4 parts of bentonite, 0.3 parts of amphoteric organic ion salt monomers, 0.15 parts of a crosslinking agent, 0.075 parts of a cage-type silsesquioxane containing vinyl and epoxy groups, 0.09 parts of a reactive β-cyclodextrin quaternary ammonium salt, 0.08 parts of an alkoxy-containing monomer, 0.65 parts of volcanic ash, 0.2 parts of nanofibers, 0.065 parts of sodium tripolyphosphate, 0.007 parts of an initiator, 0.02 parts of 2,3-quinolinedicarboxylic acid, and 15 parts of water.

[0037] The initiator is sodium persulfate; the nanofibers are graphene oxide nanofibers with an average diameter of 70 nm and a length of 7.5 μm; the particle size of the volcanic ash is 1000 mesh; and the alkoxy-containing monomer is vinyltrimethoxysilane.

[0038] The reactive β-cyclodextrin quaternary ammonium salt is prepared according to the method of Example 6 of the Chinese invention patent application number 201610596491.X; the cage-type silsesquioxane containing vinyl and epoxy groups is prepared according to the method of Example 1 of the Chinese invention patent application number 200910081260.5.

[0039] The cross-linking agent is a mixture of 2,4-diamino-6-diallylamino-1,3,5-triazine, bis(1-vinyl imidazole-2-) ketone, 2,4,6-trivinyl cycloboroxine, and 3,9-divinyl-2,4,8,10-tetraoxaspiro[5.5]undecane in a mass ratio of 4:0.65:0.2:1; the amphoteric organic ion salt monomer is 3-[N,N-dimethyl-[2-(2-methylprop-2-enoyloxy)ethyl]ammonium]propane-1-sulfonic acid inner salt; the bentonite is sodium calcium bentonite; and the particle size of the bentonite is 350 mesh.

[0040] A preparation method of the polymer bentonite composite anti-seepage material comprises the following steps: uniformly mixing the raw materials according to parts by weight, stirring and reacting at 73°C for 4 hours, filtering, drying at 95°C to constant weight, grinding and passing through a 230-mesh sieve to obtain the polymer bentonite composite anti-seepage material. Example 4

[0041] A polymer bentonite composite anti-seepage material is prepared from the following raw materials in parts by weight: 4.5 parts of bentonite, 0.35 parts of amphoteric organic ion salt monomers, 0.18 parts of a crosslinking agent, 0.09 parts of a cage-type silsesquioxane containing vinyl and epoxy groups, 0.1 parts of a reactive β-cyclodextrin quaternary ammonium salt, 0.09 parts of an alkoxy-containing monomer, 0.75 parts of volcanic ash, 0.25 parts of nanofibers, 0.075 parts of sodium tripolyphosphate, 0.009 parts of an initiator, 0.025 parts of 2,3-quinolinedicarboxylic acid, and 18 parts of water.

[0042] The initiator is a mixture of ammonium persulfate, potassium persulfate, and sodium persulfate in a mass ratio of 1:2:3; the nanofibers are graphene oxide nanofibers with an average diameter of 90 nm and a length of 9 µm; the particle size of the volcanic ash is 1100 mesh; and the alkoxy-containing monomer is a mixture of vinyltrimethoxysilane and methacryloxypropyltriethoxysilane in a mass ratio of 3:5.

[0043] The reactive β-cyclodextrin quaternary ammonium salt is prepared according to the method of Example 6 of the Chinese invention patent application number 201610596491.X; the cage-type silsesquioxane containing vinyl and epoxy groups is prepared according to the method of Example 1 of the Chinese invention patent application number 200910081260.5.

[0044] The cross-linking agent is a mixture of 2,4-diamino-6-diallylamino-1,3,5-triazine, bis(1-vinyl imidazole-2-) ketone, 2,4,6-trivinyl cycloboroxine, and 3,9-divinyl-2,4,8,10-tetraoxaspiro[5.5]undecane in a mass ratio of 4.5:0.75:0.25:1; the amphoteric organic ion salt monomer is 3-[N,N-dimethyl-[2-(2-methylprop-2-enoyloxy)ethyl]ammonium]propane-1-sulfonic acid inner salt; the bentonite is calcium-based bentonite; and the particle size of the bentonite is 450 mesh.

[0045] A preparation method of the polymer bentonite composite anti-seepage material comprises the following steps: uniformly mixing the raw materials according to parts by weight, stirring and reacting at 78°C for 4.5 hours, filtering, drying at 100°C to constant weight, grinding and passing through a 280-mesh sieve to obtain the polymer bentonite composite anti-seepage material. Example 5

[0046] A polymer bentonite composite anti-seepage material is prepared from the following raw materials in parts by weight: 5 parts of bentonite, 0.4 parts of amphoteric organic ion salt monomers, 0.2 parts of a crosslinking agent, 0.1 parts of a cage-type silsesquioxane containing vinyl and epoxy groups, 0.12 parts of a reactive β-cyclodextrin quaternary ammonium salt, 0.1 parts of an alkoxy-containing monomer, 0.8 parts of volcanic ash, 0.3 parts of nanofibers, 0.08 parts of sodium tripolyphosphate, 0.01 parts of an initiator, 0.03 parts of 2,3-quinolinedicarboxylic acid, and 20 parts of water.

[0047] The initiator is ammonium persulfate; the nanofibers are graphene oxide nanofibers with an average diameter of 100 nm and a length of 10 μm; the particle size of the volcanic ash is 1200 mesh; and the alkoxy-containing monomer is vinyltrimethoxysilane.

[0048] The reactive β-cyclodextrin quaternary ammonium salt is prepared according to the method of Example 6 of the Chinese invention patent application number 201610596491.X; the cage-type silsesquioxane containing vinyl and epoxy groups is prepared according to the method of Example 1 of the Chinese invention patent application number 200910081260.5.

[0049] The cross-linking agent is a mixture of 2,4-diamino-6-diallylamino-1,3,5-triazine, bis(1-vinyl imidazole-2-) ketone, 2,4,6-trivinyl boroxine, and 3,9-divinyl-2,4,8,10-tetraoxaspiro[5.5]undecane in a mass ratio of 5:0.8:0.3:1; the amphoteric organic ion salt monomer is 3-[N,N-dimethyl-[2-(2-methylprop-2-enoyloxy)ethyl]ammonium]propane-1-sulfonic acid inner salt; the bentonite is a mixture of calcium bentonite, sodium bentonite, and sodium calcium bentonite in a mass ratio of 1:3:5; and the particle size of the bentonite is 500 mesh.

[0050] A preparation method of the polymer bentonite composite anti-seepage material comprises the following steps: uniformly mixing the raw materials according to parts by weight, stirring and reacting at 80°C for 5 hours, filtering, drying at 105°C to constant weight, grinding, and passing through a 300-mesh sieve to obtain the polymer bentonite composite anti-seepage material.

[0051] Comparative Example 1

[0052] A polymer bentonite composite anti-seepage material is substantially the same as that of Example 1, except that no amphoteric organic ion salt monomer and nanofiber are added.

[0053] Comparative Example 2

[0054] A polymer bentonite composite anti-seepage material is substantially the same as that of Example 1, except that reactive β-cyclodextrin quaternary ammonium salt and 2,3-quinolinedicarboxylic acid are not added.

[0055] To further illustrate the beneficial technical effects of the polymer-bentonite composite anti-seepage materials of various embodiments of the present invention, relevant performance tests were conducted on the polymer-bentonite composite anti-seepage materials prepared in Examples 1-5 and Comparative Examples 1-2. The test results are shown in Table 1. The testing methods are as follows: The permeability coefficient was tested using the variable head permeability test specified in JTG E40-2007, an industry standard of the People's Republic of China. The test solutions used were pure water, nitric acid solution (pH = 3), sodium hydroxide solution (pH = 12), and sodium chloride solution (600 mM), respectively, to test the modified bentonite's barrier properties to acid, alkali, and salt solutions. The resistance to wet-dry cycling was measured by the permeability coefficient after five wet-dry cycles; a lower value indicates greater resistance to wet-dry cycling. The testing method is based on Chinese invention patent application number 202211486096.8.

[0056] Table 1

[0057]

[0058] As can be seen from Table 1, the polymer bentonite composite anti-seepage materials disclosed in each embodiment of the present invention have better anti-seepage performance than the comparative example method, better acid, alkali and salt resistance, and stronger resistance to dry-wet cycles; the addition of amphoteric organic ion salt monomers, nanofibers, reactive β-cyclodextrin quaternary ammonium salts and 2,3-quinolinedicarboxylic acid is beneficial to improving the above properties.

[0059] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions merely illustrate the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A polymer bentonite composite anti-seepage material, characterized in that: The invention comprises the following raw materials in parts by weight: 3-5 parts of bentonite, 0.2-0.4 parts of amphoteric organic ion salt monomers, 0.1-0.2 parts of a crosslinking agent, 0.05-0.1 parts of a cage-type silsesquioxane containing vinyl and epoxy groups, 0.06-0.12 parts of a reactive beta-cyclodextrin quaternary ammonium salt, 0.05-0.1 parts of an alkoxy-containing monomer, 0.5-0.8 parts of volcanic ash, 0.1-0.3 parts of nanofibers, 0.05-0.08 parts of sodium tripolyphosphate, 0.005-0.01 parts of an initiator, 0.01-0.03 parts of 2,3-quinolinedicarboxylic acid, and 10-20 parts of water.

2. The polymer bentonite composite anti-seepage material according to claim 1, characterized in that: The initiator is at least one of ammonium persulfate, potassium persulfate, and sodium persulfate.

3. The polymer bentonite composite anti-seepage material according to claim 1, characterized in that: The nanofibers are graphene oxide nanofibers with an average diameter of 30-100 nm and a length of 5-10 μm.

4. The polymer bentonite composite anti-seepage material according to claim 1, characterized in that: The particle size of the volcanic ash is 800-1200 meshes.

5. The polymer bentonite composite anti-seepage material according to claim 1, characterized in that: The alkoxy-containing monomer is at least one of vinyltrimethoxysilane and methacryloxypropyltriethoxysilane.

6. The polymer bentonite composite anti-seepage material according to claim 1, characterized in that: The crosslinking agent is a mixture of 2,4-diamino-6-diallylamino-1,3,5-triazine, bis(1-vinyl imidazole-2-) ketone, 2,4,6-trivinyl cycloboroxine, and 3,9-divinyl-2,4,8,10-tetraoxaspiro[5.5]undecane in a mass ratio of (3-5):(0.5-0.8):(0.1-0.3):

1.

7. The polymer bentonite composite anti-seepage material according to claim 1, characterized in that: The amphoteric organic ion salt monomer is 3-[N,N-dimethyl-[2-(2-methylprop-2-enoyloxy)ethyl]ammonium]propane-1-sulfonic acid inner salt.

8. The polymer bentonite composite anti-seepage material according to claim 1, characterized in that: The bentonite is at least one of calcium-based bentonite, sodium-based bentonite and sodium-calcium-based bentonite.

9. The polymer bentonite composite anti-seepage material according to claim 1, characterized in that: The particle size of the bentonite is 200-500 meshes.

10. A method for preparing the polymer bentonite composite anti-seepage material according to any one of claims 1 to 9, characterized in that: The method comprises the following steps: uniformly mixing the raw materials according to parts by weight, stirring and reacting at 65-80 DEG C for 3-5 hours, filtering, drying at 85-105 DEG C to constant weight, grinding and passing through a 150-300 mesh sieve to obtain a polymer bentonite composite anti-seepage material.

Images