Reservoir dam anti-seepage composite reinforcing material and preparation method thereof

Abstract

The invention relates to a reservoir dam anti-seepage composite reinforcing material which is formed by mixing and reacting a component A, a component B and a component C. The component A is composed of mixed water glass, ethylene glycol, waterborne polyether, glycerol, a catalyst and a surfactant; the component B is composed of PAPI, a polyurethane prepolymer, a water glass curing agent, a plasticizer, an anti-hydrolysis agent, a mildew preventive and a light stabilizer; and the component C consists of super absorbent resin and an additive. The preparation method comprises the following steps: firstly, uniformly stirring and mixing the component A and the component B, defoaming, then adding the component C into the component B, further uniformly mixing, and then mixing and reacting by a grouting machine according to the volume ratio of A: (B + C) of 1: 1 to obtain the slurry. The compound reinforcing material for seepage prevention of the reservoir dam is excellent in comprehensive mechanical property and reinforcing effect and environmentally friendly, slurry is directly grouted into cracks of a dam foundation during use, the slurry further absorbs water and expands when encountering water, and the secondary leaking stoppage and seepage prevention effects are achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of water conservancy engineering, and in particular relates to a reservoir dam anti-seepage composite reinforcement material and a preparation method thereof. Background Art

[0002] Water conservancy projects are important projects for humans to regulate and utilize water resources. Their construction and operation are of great significance to social economy and people's lives. my country has a vast territory and rich water resources. Strengthening the construction and management of reservoirs and dams can dredge water conservancy and strengthen the utilization of water resources. It is a public infrastructure construction that benefits the country and the people. However, most reservoirs and dams are located in remote mountainous areas, and the construction of water conservancy projects is difficult. The anti-seepage problem of reservoir dams is more prominent. Once a reservoir dam leaks, it may cause huge economic losses and may also cause harm to people's lives and property. Therefore, it is very important to improve the anti-seepage construction quality of water conservancy projects and strengthen the solution to the anti-seepage problem in water conservancy projects.

[0003] It is a very common phenomenon that cracks appear in the concrete dam of a reservoir. It not only affects the normal working state of the dam, but also endangers the integrity and durability of the dam body and shortens the life of the project. As people's understanding of the problem of concrete cracks continues to deepen, the academic community generally believes that concrete cracks are the result of the combined effects of temperature changes, concrete volume shrinkage, water loss and drying shrinkage, and concrete volume deformation and shrinkage, among which temperature changes play a major role. Therefore, preventing the dam body from cracking and causing damage due to excessive temperature and humidity is an urgent problem to be solved.

[0004] For many years, the insulation and crack prevention of dam projects generally use foam plastic boards or cardboard for insulation, or foam plastic boards plus polyvinyl chloride films and polystyrene foam plastic boards. This method has problems such as complex construction technology and unstable insulation and crack prevention effects. Patent No. ZL01259064.9, entitled "A dam to prevent surface cracks", proposes spraying polyurethane foam material on the surface of cement concrete dams. The polyurethane material is sprayed on the concrete surface to form a hard foam, which has strong adhesion and can effectively connect with cement (concrete) to achieve good thermal insulation and moisture retention effects, effectively preventing cracks in the dam concrete. The disadvantage of polyurethane material is that it has poor oxidation resistance and presents different colors in the later stage with the irradiation of sunlight. The material matching is relatively complex, the construction conditions are relatively high, and the construction technicians and environmental conditions are relatively high. Patent No. 202210382603.7, entitled "An anti-seepage concrete for reservoir dams and its preparation method", discloses an anti-seepage concrete prepared with components such as cement, water, gravel, sand, glass fiber, polyoxymethylene fiber, mineral powder, fly ash, steel slag powder, etc., which can improve the anti-seepage performance of concrete. However, there are problems such as complex process, the need for an external magnetic field and general anti-seepage effect. When the above technical solutions are used, their anti-seepage performance cannot meet actual needs. Therefore, it is urgently necessary to develop a new type of efficient, environmentally friendly and economical anti-seepage material for reservoir dams. Summary of the invention

[0005] In order to further improve the anti-seepage performance of concrete, the present invention provides a composite reinforcement material for anti-seepage of a reservoir dam and a preparation method thereof to solve the problems raised in the above background technology.

[0006] In order to achieve the above technical objectives, the present invention adopts the following technical solutions.

[0007] A composite reinforcement material for preventing seepage of a reservoir dam, which is prepared by mixing components A, B and C, and the mass fractions of each component are as follows:

[0008] Component A: 70-82 parts of mixed water glass, 15-25 parts of ethylene glycol, 5-10 parts of water-based polyether, 1-5 parts of propylene glycol, 2-3 parts of catalyst, 1-2 parts of surfactant; preferably, the mixed water glass is a mixture of sodium silicate water glass, potassium silicate water glass and lithium silicate water glass in a mass ratio of 8:1:1; wherein the modulus of the sodium silicate water glass is 2.2-2.4 and the density is 1.4-1.5 g / cm 3 (20°C), the modulus of the potassium silicate water glass is 3.0-3.4, and the density is 1.3-1.4 g / cm 3 (20°C), the modulus of the lithium silicate water glass is 4.6-5.0, and the density is 1.1-1.2 g / cm 3(20°C); preferably, the catalyst is a mixture of dimorpholine diethyl ether and triethylamine in a mass ratio of 7:3; preferably, the surfactant is any one of the non-ionic surfactants OP-10 or AEO-9.

[0009] Component B: 65-83 parts of polymethylene polyphenyl polyisocyanate (PAPI), 10-15 parts of polyurethane prepolymer, 2-5 parts of water glass curing agent, 2-5 parts of plasticizer, 1-2 parts of anti-hydrolysis agent, 0.5-1 part of mildewproof agent, 0.5-1 part of light stabilizer; preferably, the polyurethane prepolymer is a polyurethane prepolymer with an isocyanate group-NCO mass content of 7% prepared by reacting polyether polyol N220 with diisocyanate MDI-50, and the specific preparation method is: 100g of polyether polyol N220 is weighed accurately and dehydrated at 120°C for 2h. When the temperature drops to 60°C, 42.1g of diisocyanate MDI-50 is accurately added, and the mixture is reacted at 70°C for 40min and 80°C for 2h to obtain a prepolymer with an isocyanate group-NCO% content of 7%. Preferably, the water glass curing agent is a mixture of one or two of tripropionin, propylene carbonate and triethylene glycol diacetate. Preferably, the plasticizer is chlorinated paraffin.

[0010] Component C: 4-8 parts of super absorbent resin, 5-8 parts of additives; preferably, the super absorbent resin is a powder with a fineness of 80 mesh, and a sodium polyacrylate type or potassium polyacrylate type super absorbent resin with a water absorption rate of 600-800; preferably, the additive is a mixture of 1 part of sericite powder, 5 parts of sodium bentonite, and 1 part of carboxymethyl cellulose;

[0011] The present invention discloses a composite reinforcement material for preventing seepage of a reservoir dam and a preparation method thereof, comprising the following steps:

[0012] The first step is to prepare component A: add 15 to 25 parts of ethylene glycol and 5 to 10 parts of water-based polyether into a stirred reactor and mix them evenly; then add 70 to 82 parts of mixed water glass, 1 to 5 parts of propylene glycol, 2 to 3 parts of catalyst and 1 to 2 parts of surfactant into the mixture in order according to the mass fractions, mix evenly at room temperature and pressure, at a speed of 40 to 60 r / min, and then vacuum degas for 30 minutes under stirring at a vacuum degree of 0.08 to 0.09 MPa to obtain component A material;

[0013] Step 2, preparation of component B: 65-83 parts of polymethylene polyphenyl polyisocyanate (PAPI), 10-15 parts of polyurethane prepolymer, 2-5 parts of water glass curing agent, 2-5 parts of plasticizer, 1-2 parts of anti-hydrolysis agent, 0.5-1 part of mildewproof agent, and 0.5-1 part of light stabilizer in component B are added to a stirring kettle in strict accordance with the mass parts, mixed evenly under the stirring state of 40-60r / min, and then vacuum degassed for 30min under the condition of vacuum degree of 0.08-0.09MPa to obtain component B material;

[0014] Step 3, preparation of component C: drying 4 to 8 parts of highly absorbent resin and 5 to 8 parts of additives at 90 to 100° C. for 2 hours, and stirring and mixing them uniformly to obtain component C material;

[0015] The fourth step is to prepare slurry by mixing reaction with a grouting machine: respectively put the above-mentioned component A material and component B material into two 150-liter plastic barrels No. 1 and No. 2, and then pour component C into plastic barrel No. 2 and stir evenly; use a grouting machine to grout the components in material barrels No. 1 and No. 2 into the cracks at a volume ratio of 1:1, and solidify and form them in 2 to 3 minutes to obtain a composite reinforcement material for reservoir dam anti-seepage; the grouting machine is a SQZB50 pneumatic grouting machine produced by Jiaozuo Yuzhou Machinery Equipment Co., Ltd.

[0016] The positive effects of the composite reinforcement material for preventing seepage of a reservoir dam and the preparation method thereof of the present invention are as follows:

[0017] First, the present invention forms a composite reinforcement material for preventing reservoir dam from seeing through by compounding sodium polyacrylate type or potassium polyacrylate type super absorbent resin, water glass, polymethylene polyphenyl polyisocyanate (PAPI) and the like.

[0018] Second, after the reaction of polymethylene polyphenyl polyisocyanate (PAPI) and water-based polyether, the polyurethane macromolecular chain formed is hydrophilic and can swell when encountering water, playing a role in preventing seepage and blocking water.

[0019] Third, the composite material has a good effect of reinforcing cracks, stopping water and preventing leakage. When the grouting machine injects liquid material into the cracks of the reservoir dam, the liquid material solidifies quickly and tightly bonds with the side edges of the cracks, which plays a role in reinforcing, plugging leaks and preventing seepage in the dam cracks; when the cracks encounter water again, the water-absorbing components in the composite reinforcement material, such as superabsorbent resin, sodium-based bentonite, and water-based polyether chain segments, will absorb water and expand, playing a secondary role in plugging leaks and preventing seepage.

[0020] Fourth, according to the principle of structural similarity and compatibility, the silicate / polyurethane composite reinforcement material has excellent adhesion to the cracks of silicate cement dams, which can prevent the cracks from further expanding.

[0021] Fifth, the composite reinforcement material prepared by the present invention does not use low-molecular organic solvents, is environmentally friendly, does not pollute water sources, and is green and environmentally friendly. DETAILED DESCRIPTION

[0022] The following is a detailed description of an embodiment of the present invention. This embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation method and process are given, but the protection scope of the present invention is not limited to the following embodiment.

[0023] In the following examples, the water-based polyether adopts TG-4800 water-based polyether produced by Jiangsu Zhongshan Chemical Co., Ltd.; the PAPI adopts polymethylene polyphenyl polyisocyanate produced by Yantai Wanhua Chemical Co., Ltd.; the anti-hydrolysis agent adopts HYDROSTAB-P200 anti-hydrolysis agent produced by Shanghai Laian Industrial Co., Ltd.; the anti-mildew agent adopts EWP anti-mildew agent produced by Beijing Qifei Technology Development Co., Ltd.; the light stabilizer adopts RIASORBUV-329 light stabilizer produced by Tianjin Lianlong New Materials Co., Ltd. In the following examples, the experimental methods without specific conditions are usually based on conventional conditions.

[0024] [Example 1]

[0025] The composite reinforcement material for preventing seepage of a reservoir dam and a preparation method thereof described in this embodiment include the following material components in parts by weight:

[0026] Component A: Mix 70 parts of water glass, 15 parts of ethylene glycol, 5 parts of water-based polyether, 1 part of glycerol, 2 parts of catalyst, and 1 part of OP-10 surfactant;

[0027] Component B: 65 parts of PAPI, 10 parts of polyurethane prepolymer, 2 parts of tripropionate water glass curing agent, 2 parts of chlorinated paraffin plasticizer, 1 part of anti-hydrolysis agent, 0.5 parts of mildew inhibitor, 0.5 parts of light stabilizer;

[0028] Component C: 4 parts of sodium polyacrylate type super absorbent resin and 5 parts of additives;

[0029] The first step is to prepare component A: first, add 15 parts of ethylene glycol and 5 parts of water-based polyether into a stirred reactor and mix them evenly; then, add 70 parts of mixed water glass, 1 part of propylene glycol, 2 parts of catalyst and 1 part of OP-10 surfactant into the mixture in order according to the mass fractions, mix evenly at room temperature and pressure, at a speed of 40 to 60 r / min, and then, under stirring, vacuum degassing for 30 minutes at a vacuum degree of 0.08 to 0.09 MPa to obtain component A material;

[0030] Step 2, preparation of component B: 65 parts of PAPI, 10 parts of polyurethane prepolymer, 2 parts of tripropionate water glass curing agent, 2 parts of chlorinated paraffin plasticizer, 1 part of anti-hydrolysis agent, 0.5 parts of mildew inhibitor, and 0.5 parts of light stabilizer in component B are added into a stirring kettle in strict accordance with the mass parts, mixed evenly under the stirring state of 40-60r / min, and then vacuum degassed for 30 minutes under the condition of vacuum degree of 0.08-0.09MPa to obtain component B material;

[0031] Step 3, preparation of component C: drying 4 parts of sodium polyacrylate type super absorbent resin and 5 parts of additives at 90-100° C. for 2 hours, and stirring and mixing them evenly to obtain component C material;

[0032] The fourth step is to make slurry by mixing reaction with a grouting machine: respectively put the above-mentioned component A material and component B material into two 150-liter plastic barrels No. 1 and No. 2, and then pour component C into plastic barrel No. 2 and stir evenly; then use a grouting machine to grout the components in material barrels No. 1 and No. 2 into the cracks in a volume ratio of 1:1, and solidify them in 2 to 3 minutes to obtain a composite reinforcement material for reservoir dam anti-seepage.

[0033] [Example 2]

[0034] The composite reinforcement material for preventing seepage of a reservoir dam and a preparation method thereof described in this embodiment include the following material components in parts by weight:

[0035] Component A: 82 parts of mixed water glass, 25 parts of ethylene glycol, 10 parts of water-based polyether, 5 parts of glycerol, 3 parts of catalyst, and 2 parts of OP-10 surfactant;

[0036] Component B: 83 parts of PAPI, 15 parts of polyurethane prepolymer, 5 parts of triethylene glycol diacetate water glass curing agent, 5 parts of chlorinated paraffin plasticizer, 2 parts of anti-hydrolysis agent, 1 part of mildew inhibitor, 1 part of light stabilizer;

[0037] Component C: 8 parts of sodium polyacrylate type super absorbent resin and 8 parts of additives;

[0038] The first step is the preparation of component A: first, 25 parts of ethylene glycol and 10 parts of water-based polyether are added to a stirred reactor and mixed evenly; then, 82 parts of mixed water glass, 5 parts of propylene glycol, 3 parts of catalyst and 2 parts of OP-10 surfactant are added to the mixture in sequence according to the mass fractions, mixed evenly at room temperature and pressure, at a speed of 40 to 60 r / min, and then vacuum degassed for 30 minutes under stirring at a vacuum degree of 0.08 to 0.09 MPa to obtain component A material;

[0039] Step 2, preparation of component B: 83 parts of PAPI, 15 parts of polyurethane prepolymer, 5 parts of triethylene glycol diacetate water glass curing agent, 5 parts of chlorinated paraffin plasticizer, 2 parts of anti-hydrolysis agent, 1 part of mildew inhibitor, and 1 part of light stabilizer in component B are added to a stirring kettle in strict accordance with the mass parts, mixed evenly under the stirring state of 40-60r / min, and then vacuum degassed for 30 minutes under the condition of vacuum degree of 0.08-0.09MPa to obtain component B material;

[0040] Step 3, preparation of component C: drying 8 parts of sodium polyacrylate type super absorbent resin and 8 parts of additives at 90-100° C. for 2 hours, and stirring and mixing them evenly to obtain component C material;

[0041] The fourth step is to make slurry by mixing reaction with a grouting machine: respectively put the above-mentioned component A material and component B material into two 150-liter plastic barrels No. 1 and No. 2, and then pour component C into plastic barrel No. 2 and stir evenly; use a grouting machine to grout the components in material barrels No. 1 and No. 2 into the cracks at a volume ratio of 1:1, and solidify and form in 2 to 3 minutes to obtain a composite reinforcement material for reservoir dam anti-seepage.

[0042] [Example 3]

[0043] The composite reinforcement material for preventing seepage of a reservoir dam and a preparation method thereof described in this embodiment include the following material components in parts by weight:

[0044] Component A: Mix 76 parts of water glass, 20 parts of ethylene glycol, 7 parts of water-based polyether, 3 parts of glycerol, 2 parts of catalyst, and 2 parts of AEO-9 surfactant;

[0045] Component B: PAPI 75 parts, polyurethane prepolymer 13 parts, propylene carbonate water glass curing agent 3 parts, chlorinated paraffin plasticizer 3 parts, anti-hydrolysis agent 1.5 parts, mildew inhibitor 0.7 parts, light stabilizer 0.7 parts;

[0046] Component C: 6 parts of potassium polyacrylate type super absorbent resin and 6 parts of additives;

[0047] The first step is the preparation of component A: first, 20 parts of ethylene glycol and 7 parts of water-based polyether are added to a stirred reactor and mixed evenly; then 76 parts of mixed water glass, 3 parts of propylene glycol, 2 parts of catalyst and 2 parts of AEO-9 surfactant are added to the mixture in sequence according to the mass fractions, mixed evenly at room temperature and pressure, at a speed of 40 to 60 r / min, and then vacuum degassed for 30 minutes under stirring at a vacuum degree of 0.08 to 0.09 MPa to obtain component A material;

[0048] Step 2: Preparation of component B: 75 parts of PAPI, 13 parts of polyurethane prepolymer, 3 parts of propylene carbonate water glass curing agent, 3 parts of chlorinated paraffin plasticizer, 1.5 parts of anti-hydrolysis agent, 0.7 parts of mildew inhibitor, and 0.7 parts of light stabilizer in component B are added to a stirring kettle in strict accordance with the mass parts, mixed evenly under the stirring state of 40-60r / min, and then vacuum degassed for 30 minutes under the condition of vacuum degree of 0.08-0.09MPa to obtain component B material;

[0049] Step 3, preparation of component C: drying 6 parts of potassium polyacrylate type super absorbent resin and 6 parts of additives at 90-100° C. for 2 hours, and stirring and mixing them evenly to obtain component C material;

[0050] The fourth step is to make slurry by mixing reaction with a grouting machine: respectively put the above-mentioned component A material and component B material into two 150-liter plastic barrels No. 1 and No. 2, and then pour component C into plastic barrel No. 2 and stir evenly; use a grouting machine to grout the components in material barrels No. 1 and No. 2 into the cracks at a volume ratio of 1:1, and solidify and form in 2 to 3 minutes to obtain a composite reinforcement material for reservoir dam anti-seepage.

[0051] [Example 4]

[0052] The composite reinforcement material for preventing seepage of a reservoir dam and a preparation method thereof described in this embodiment include the following material components in parts by weight:

[0053] Component A: Mix 78 parts of water glass, 17 parts of ethylene glycol, 8 parts of water-based polyether, 4 parts of glycerol, 2 parts of catalyst, and 2 parts of AEO-9 surfactant;

[0054] Component B: PAPI 78 parts, polyurethane prepolymer 12 parts, triethylene glycol diacetate water glass curing agent 4 parts, chlorinated paraffin plasticizer 4 parts, anti-hydrolysis agent 1.7 parts, mildew inhibitor 0.8 parts, light stabilizer 0.8 parts;

[0055] Component C: 5 parts of sodium polyacrylate type super absorbent resin and 7 parts of additives;

[0056] The first step is the preparation of component A: first, 17 parts of ethylene glycol and 8 parts of water-based polyether are added to a stirred reactor and mixed evenly; then, 78 parts of mixed water glass, 4 parts of propylene glycol, 2 parts of catalyst and 2 parts of AEO-9 surfactant are added to the mixture in sequence according to the mass fractions, mixed evenly at room temperature and pressure, at a speed of 40 to 60 r / min, and then vacuum degassed for 30 minutes under stirring at a vacuum degree of 0.08 to 0.09 MPa to obtain component A material;

[0057] Step 2: Preparation of component B: 78 parts of PAPI, 12 parts of polyurethane prepolymer, 4 parts of triethylene glycol diacetate water glass curing agent, 4 parts of chlorinated paraffin plasticizer, 1.7 parts of anti-hydrolysis agent, 0.8 parts of mildew inhibitor, and 0.8 parts of light stabilizer in component B are added to a stirring kettle in strict accordance with the mass parts, mixed evenly under the stirring state of 40-60 r / min, and then vacuum degassed for 30 minutes under the condition of vacuum degree of 0.08-0.09 MPa to obtain component B material;

[0058] Step 3, preparation of component C: drying 5 parts of sodium polyacrylate type super absorbent resin and 7 parts of additives at 90-100°C for 2 hours, and stirring and mixing them evenly;

[0059] The third step is to load the above-mentioned component A materials and component B materials into two 150-liter plastic barrels No. 1 and No. 2 respectively, and then pour component C into plastic barrel No. 2 and stir evenly; use a grouting machine to grout the components in material barrels No. 1 and No. 2 into the cracks in a volume ratio of 1:1, and solidify them in 2 to 3 minutes to obtain a composite reinforcement material for reservoir dam anti-seepage.

[0060] [Example 5]

[0061] The composite reinforcement material for preventing seepage of a reservoir dam and a preparation method thereof described in this embodiment include the following material components in parts by weight:

[0062] Component A: Mix 73 parts of water glass, 22 parts of ethylene glycol, 9 parts of water-based polyether, 3 parts of glycerol, 3 parts of catalyst, and 1 part of OP-10 surfactant;

[0063] Component B: PAPI 75 parts, polyurethane prepolymer 14 parts, propylene carbonate and triethylene glycol diacetate (1:1) water glass curing agent 3 parts, chlorinated paraffin plasticizer 3 parts, anti-hydrolysis agent 1.5 parts, mildew inhibitor 0.7 parts, light stabilizer 0.7 parts;

[0064] Component C: 7 parts of sodium polyacrylate type super absorbent resin and 7 parts of additives;

[0065] The first step is the preparation of component A: first, 22 parts of ethylene glycol and 9 parts of water-based polyether are added to a stirred reactor and mixed evenly; then, 73 parts of mixed water glass, 3 parts of propylene glycol, 3 parts of catalyst and 1 part of OP-10 surfactant are added to the mixture in sequence according to the mass fractions, mixed evenly at room temperature and pressure, at a speed of 40 to 60 r / min, and then vacuum degassed for 30 minutes under stirring at a vacuum degree of 0.08 to 0.09 MPa to obtain component A material;

[0066] Step 2: Preparation of component B: 75 parts of PAPI, 14 parts of polyurethane prepolymer, 3 parts of propylene carbonate and triethylene glycol diacetate (1:1) water glass curing agent, 3 parts of chlorinated paraffin plasticizer, 1.5 parts of anti-hydrolysis agent, 0.7 parts of mildew inhibitor, and 0.7 parts of light stabilizer in component B are added to a stirring kettle in strict accordance with the mass parts, mixed evenly under the stirring state of 40-60 r / min, and then vacuum degassed for 30 minutes under the condition of vacuum degree of 0.08-0.09 MPa to obtain component B material;

[0067] Step 3, preparation of component C: drying 7 parts of sodium polyacrylate type super absorbent resin and 7 parts of additives at 90-100° C. for 2 hours, and stirring and mixing them evenly to obtain component C material;

[0068] The fourth step is to make slurry by mixing reaction with a grouting machine: respectively put the above-mentioned component A material and component B material into two 150-liter plastic barrels No. 1 and No. 2, and then pour component C into plastic barrel No. 2 and stir evenly; use a grouting machine to grout the components in material barrels No. 1 and No. 2 into the cracks at a volume ratio of 1:1, and solidify and form in 2 to 3 minutes to obtain a composite reinforcement material for reservoir dam anti-seepage.

[0069] The mechanical properties of the composite reinforcement materials prepared in Examples 1 to 5 meet the technical parameter indicators of Table 1. The corresponding material mechanical property testing methods refer to GB / T2567-2021 "Resin Casting Performance Test Method", GB / T6328-2021 "Adhesive Shear Impact Strength Test Method", GB / T1040.2-2006 "Determination of Tensile Properties of Plastics", GB / T50081-2019 "Concrete Physical and Mechanical Properties Test Method Standard", JC / T2041-2020 "Polyurethane Grouting Material" and other relevant national standards.

[0070] Table 1 Technical parameters of mechanical properties of composite reinforcement materials for reservoir dam anti-seepage

[0071]

[0072] It can be seen that the comprehensive mechanical properties and reinforcement effect of the composite reinforcement material for reservoir dam anti-seepage of the present invention are significantly better than those of the traditional reservoir dam reinforcement material, and after the slurry is directly grouted into the cracks of the dam foundation, the reinforcement material will absorb water and swell when it encounters water, playing a secondary plugging and anti-seepage role. In addition, the composite reinforcement material for reservoir dam anti-seepage of the present invention also has the advantages of simple repair process and low cost.

Claims

1. A composite reinforcement material for reservoir dam anti-seepage, characterized in that: The slurry is prepared by mixing components A, B and C. The mass fractions of each component are as follows: Component A: 70-82 parts of mixed water glass, 15-25 parts of ethylene glycol, 5-10 parts of water-based polyether, 1-5 parts of propylene glycol, 2-3 parts of catalyst, 1-2 parts of surfactant; Component B: 65-83 parts of PAPI, 10-15 parts of polyurethane prepolymer, 2-5 parts of water glass curing agent, 2-5 parts of plasticizer, 1-2 parts of anti-hydrolysis agent, 0.5-1 part of mildewproof agent, 0.5-1 part of light stabilizer; Component C: 4 to 8 parts of highly absorbent resin and 5 to 8 parts of additives.

2. The composite reinforcement material for reservoir dam anti-seepage according to claim 1, characterized in that: In component A, the mixed water glass is a mixture of sodium silicate water glass, potassium silicate water glass and lithium silicate water glass in a mass ratio of 8:1:1; wherein the modulus of the sodium silicate water glass is 2.2-2.4 and the density is 1.4-1.5 g / cm 3 (20°C), the modulus of the potassium silicate water glass is 3.0-3.4, and the density is 1.3-1.4 g / cm 3 (20°C), the modulus of the lithium silicate water glass is 4.6-5.0, and the density is 1.1-1.2 g / cm 3 (20℃).

3. The composite reinforcement material for reservoir dam anti-seepage according to claim 1, characterized in that: In component A, the catalyst is a mixture of dimorpholine diethyl ether and triethylamine in a mass ratio of 7:

3.

4. The composite reinforcement material for reservoir dam anti-seepage according to claim 1, characterized in that: In component A, the surfactant is any one of the nonionic surfactants OP-10 or AEO-9.

5. The composite reinforcement material for reservoir dam anti-seepage according to claim 1, characterized in that: In component B, the polyurethane prepolymer is a polyurethane prepolymer with an isocyanate-NCO mass content of 7% prepared by reacting polyether polyol N220 and diisocyanate MDI-50. The specific preparation method is: accurately weigh 100g of polyether polyol N220, and dehydrate it at 120°C for 2h. When the temperature drops to 60°C, accurately add 42.1g of diisocyanate MDI-50, react at 70°C for 40min, and react at 80°C for 2h to obtain a prepolymer with an isocyanate-NCO content of 7%.

6. The composite reinforcement material for reservoir dam anti-seepage according to claim 1, characterized in that: In component B, the water glass curing agent is one or a mixture of two of tripropionin, propylene carbonate and triethylene glycol diacetate.

7. The composite reinforcement material for reservoir dam anti-seepage according to claim 1, characterized in that: In component B, the plasticizer is chlorinated paraffin.

8. The composite reinforcement material for reservoir dam anti-seepage according to claim 1, characterized in that: The super absorbent resin is a powder with a fineness of 80 meshes and is a sodium polyacrylate type or potassium polyacrylate type super absorbent resin with a water absorption ratio of 600-800.

9. The composite reinforcement material for reservoir dam anti-seepage according to claim 1, characterized in that: In component C, the additive is a mixture of sericite powder, sodium bentonite and carboxymethyl cellulose in a mass ratio of 1:5:

1.

10. A method for preparing a composite reinforcement material for reservoir dam anti-seepage according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1. Preparation of component A: 15-25 parts of ethylene glycol and 5-10 parts of aqueous polyether are added to a stirred reactor and mixed evenly; then 70-82 parts of mixed water glass, 1-5 parts of propylene glycol, 2-3 parts of catalyst and 1-2 parts of surfactant are added to the reactor in sequence, mixed evenly at a speed of 40-60 r / min, and then vacuum degassed for 30 minutes under a stirring state and a vacuum degree of 0.08-0.09 MPa to obtain component A material; S2, preparation of component B: 65-83 parts of PAPI, 10-15 parts of polyurethane prepolymer, 2-5 parts of water glass curing agent, 2-5 parts of plasticizer, 1-2 parts of anti-hydrolysis agent, 0.5-1 part of mildewproof agent, and 0.5-1 part of light stabilizer are sequentially added into a stirring kettle, mixed evenly under a stirring state of a speed of 40-60 r / min, and then vacuum degassed for 30 minutes under a vacuum degree of 0.08-0.09 MPa to obtain component B material; S3, preparation of component C: drying 4 to 8 parts of super absorbent resin and 5 to 8 parts of additives at 90 to 100° C. for 2 hours, and stirring and mixing them uniformly to obtain component C material; S 4. Mixing reaction slurry preparation by grouting machine: put component A and component B into two plastic containers respectively, then pour component C into component B and mix them evenly; use grouting machine to grout the materials in the two plastic containers into the cracks at a volume ratio of 1:1, and solidify them in 2 to 3 minutes to obtain composite reinforcement materials for reservoir dam anti-seepage.

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