High-molecular grouting material with high elongation rate and strong bonding force

Abstract

The invention relates to the field of polymer grouting materials, and discloses a polymer grouting material with high elongation and strong adhesive strength, the grouting material comprises the following components by mass: 5%-30% of a modified epoxy resin emulsion, 10%-40% of an acrylic emulsion, 1%-10% of sodium bentonite, 0.5%-5% of nano silica, 1%-5% of a high-elasticity auxiliary agent, 0.1%-5% of an initiator, and the balance of water. The modified epoxy resin emulsion comprises the following components in percentage by weight: 0.1-3% of an initiator, 0.1-3% of an accelerant, 2-8% of a difunctional cross-linking agent and deionized water which are used as solvents, and the modified epoxy resin emulsion is bisphenol A type epoxy resin with closed end groups, has the molecular weight of 2500-5000 and is modified by introducing amino-terminated silane or hydroxyl. By introducing the acrylic emulsion and the high-elasticity additive, the grouting material has extremely high ductility and flexibility, and the grouting material can meet the deformation requirement of a base material after being cured.

Description

Technical Field

[0001] The invention relates to the field of polymer grouting materials, in particular to a polymer grouting material with high elongation and strong bonding force. Background Art

[0002] In the field of construction and civil engineering, grouting materials are widely used in concrete repair, crack filling and reinforcement of large-span structures. At the same time, the application areas include underground engineering of buildings, tunnel engineering and bridge engineering where structural deformation, displacement and other requirements are required, including settlement joints and expansion joints. However, existing grouting materials, especially traditional cement-based and epoxy resin-based grouting materials, have some technical bottlenecks and shortcomings, which limit their wide application in complex environments.

[0003] Cement-based grouting materials are one of the most widely used materials at present. They are mainly based on ordinary Portland cement and have high compressive strength, but their toughness and ductility are poor. They are prone to cracking or peeling under high-strain environments, especially in construction environments with large changes in temperature or humidity. In addition, cement-based grouting materials have poor water resistance in underwater or humid environments. After long-term immersion, they are prone to bonding failure, resulting in reduced sealing performance and affecting the service life of the structure.

[0004] Epoxy resin-based grouting materials are another commonly used material with high bonding strength and good chemical corrosion resistance, and are particularly suitable for repair projects with static loads. However, epoxy resin has high rigidity, poor toughness and ductility, and is prone to brittle cracking, especially under high strain or dynamic loads, making it difficult to meet the repair needs of large-span structures and complex environments. In addition, although epoxy resin-based grouting materials have good bonding properties in underwater or humid environments, there is still the problem of weak material interface bonding, and long-term use will lead to bonding failure, especially when there are micropores or cracks in the substrate, the sealing effect is poor.

[0005] In view of the shortcomings of the prior art, the present invention provides a polymer grouting material with high elongation and strong bonding force. Summary of the invention

[0006] In view of the deficiencies of the prior art, the present invention provides a polymer grouting material with high elongation and strong bonding strength, which solves the problems of insufficient ductility, poor bonding performance and limited use environment of the prior grouting materials under high strain conditions.

[0007] To achieve the above object, the present invention is implemented by the following technical solution: a polymer grouting material with high elongation and strong bonding force, the grouting material comprises the following components by mass percentage: 5% - 30% modified epoxy resin emulsion, 10% - 40% acrylic emulsion, 1% - 10% sodium bentonite, 0.5% - 5% nano silicon dioxide, 1% - 5% high elasticity additive, 0.1% - 5% initiator, 0.1% - 3% accelerator, 2%-8% bifunctional crosslinker, Deionized water was used as solvent.

[0008] Preferably, the modified epoxy resin emulsion is a terminal-blocked bisphenol A epoxy resin with a molecular weight of 2500-5000, and is modified by introducing terminal aminosilane or hydroxyl groups.

[0009] Furthermore, the introduction of terminal aminosilane or hydroxyl groups in the modified epoxy resin emulsion enhances the bonding force between the epoxy resin and the substrate through chemical bonding, especially in a humid or high humidity environment, the polar groups of the terminal groups can produce strong hydrogen bonds or covalent bonds with the hydroxyl or carboxyl groups on the surface of the substrate, thereby improving the bonding effect between the grouting material and the substrate. Further, by optimizing the formula of the modified epoxy resin emulsion, the toughness and mechanical strength of the material after curing are balanced, especially under high load conditions, it exhibits excellent fatigue resistance.

[0010] Preferably, the acrylic emulsion comprises a copolymer of acrylic acid and methacrylate, wherein the mass ratio of acrylic acid to methacrylate is 1:1 to 1:3, and contains 5%-10% of a hydroxy acrylic acid monomer.

[0011] Furthermore, the hydroxy acrylic monomer in the acrylic emulsion is introduced into the polymer chain through copolymerization, which can increase the chemical bonding force between the polymer and the substrate surface, and enhance the mechanical properties and weather resistance of the entire system through the cross-linking reaction between its polar groups and other components. At the same time, by controlling the ratio of acrylic acid to methacrylate, the flexibility and ductility of the grouting material can be adjusted to ensure that the grouting material still has good deformation recovery ability under dynamic load conditions.

[0012] Preferably, the particle size of the nano-silica is 20 nm to 100 nm, and the surface is modified with vinyltriethoxysilane to enhance its dispersibility in the polymer matrix and its adhesion to the substrate.

[0013] Furthermore, after the nano-silica is modified with vinyl triethoxysilane, its surface polarity is significantly improved, so that it has better dispersibility in the polymer matrix, and can react chemically with the polymer chain to enhance its embedding effect in the matrix. The nano-size of nano-silica also enables it to effectively fill the micropores and cracks on the surface of the substrate, enhancing the crack resistance and mechanical strength of the grouting material.

[0014] Preferably, the high elasticity auxiliary agent is a polyurethane modified silicone elastomer with a molecular weight of 3000-8000 Daltons, which can form a flexible network with the epoxy resin emulsion through a cross-linking reaction.

[0015] Furthermore, the high elasticity additive forms a network structure with flexibility and reversible deformation ability through cross-linking reaction with epoxy groups in epoxy resin emulsion, thereby improving the ductility and deformation resistance of the grouting material. By controlling the molecular weight of the high elasticity additive, the flexibility of the grouting material can be adjusted so that it can still maintain its integrity and bonding properties under large strain conditions.

[0016] Preferably, the particle size of the sodium bentonite is 100-150 meshes, and its water absorption expansion rate is not less than 100%, which can significantly improve the impermeability and volume stability of the grouting material.

[0017] Furthermore, the particle size of the sodium bentonite is controlled at 100-150 meshes to ensure that it can fully expand after absorbing water and fill the tiny pores of the material, thereby improving the sealing performance and anti-permeability of the grouting material. The high water absorption and expansion rate of the bentonite can play an adaptive sealing effect in an environment with high humidity, effectively prevent moisture penetration, and improve the water resistance of the grouting material.

[0018] Preferably, the bifunctional crosslinking agent is polyethylene glycol diglycidyl ether, with a molecular weight of 400-600 and a mass fraction of 2%-8%, which is used to control the crosslinking density of the grouting material and enhance the material's crack resistance and bonding strength.

[0019] Furthermore, the bifunctional crosslinking agent forms a multi-layered three-dimensional crosslinking network through a chemical crosslinking reaction during the curing process, ensuring the balance of strength and toughness of the grouting material after curing. This crosslinking network not only gives the material excellent crack resistance, but also enhances its wear resistance and fatigue resistance, making it particularly suitable for applications under long-term dynamic stress conditions.

[0020] Preferably, the initiator is potassium persulfate or benzoyl peroxide, the accelerator is N,N-dimethylaniline, and the amount of the accelerator added is 0.1%-3%, which is used to accelerate the curing reaction of the system, especially under low temperature or humid conditions, to ensure rapid curing of the material.

[0021] Furthermore, the initiator potassium persulfate or benzoyl peroxide starts the curing process through free radical polymerization at room temperature, ensuring rapid curing of the system. The accelerator N,N-dimethylaniline can accelerate the curing process, especially in low temperature or humid environment, ensuring rapid molding of the material and close bonding with the substrate, preventing the degradation of bonding performance due to incomplete curing.

[0022] Preferably, the grouting material has excellent elongation properties after curing and maintains a high bonding strength in a humid environment. It can adapt to the surfaces of various substrates, including concrete, metal and wood, as well as parts of underground building projects, tunnel projects and bridge projects with structural deformation, displacement and other requirements, including settlement joints and expansion joints. It provides a reliable bonding effect on these substrates and parts with deformation requirements, and has good anti-aging and fatigue resistance.

[0023] Furthermore, the cross-linked network formed after the grouting material is cured has excellent extensibility, can adapt to the differences in thermal expansion coefficients between different substrates, and reduce stress concentration and cracking problems caused by substrate deformation. At the same time, the grouting material can still maintain a high bonding strength in a humid environment, will not fail due to moisture penetration, and has good anti-aging and fatigue resistance.

[0024] A method for preparing a polymer grouting material with high elongation and strong bonding strength comprises the following steps: (1) The modified epoxy resin emulsion and the acrylic emulsion were mixed in proportion and stirred at 60° C. for 40 minutes; (2) adding a high elasticity additive to the mixture obtained in step (1) and continuing stirring for 60 minutes; (3) Add nano-silica and bentonite to the system of step (2), and stir with a high shear mixer for 30 minutes to ensure uniform dispersion; (4) adding an initiator and a promoter to the system obtained in step (3) and stirring evenly; (5) leaving the system at room temperature for 4 hours for preliminary curing; (6) Secondary curing is carried out at 35°C for 12 h to form a multi-level cross-linked network.

[0025] The present invention provides a polymer grouting material with high elongation and strong bonding strength. It has the following beneficial effects: 1. The present invention introduces acrylic emulsion and high elastic additives to make the grouting material have extremely high ductility and flexibility. After curing, the grouting material can adapt to the deformation requirements of the substrate, is not prone to cracking or delamination in a high-strain environment, and can show good deformation ability in the repair of deformation joints, cracks and large-span structure repairs, thereby effectively extending the service life of the engineering structure.

[0026] 2. The present invention significantly improves the bonding performance of grouting materials to various substrates (including concrete, metal, and wood) through the synergistic effect of modified epoxy resin and acrylic emulsion. The epoxy resin enhances the chemical bonding force between the material and the surface of the substrate through end group modification (aminosilane or hydroxyl), ensuring that the grouting material always maintains high bonding force under static and dynamic loads, which is particularly suitable for construction scenarios in high humidity or underwater environments.

[0027] 3. The present invention adds sodium bentonite and nano-silicon dioxide, which greatly enhances the water resistance of the material. The bentonite expands after absorbing water and can effectively fill the micropores on the surface of the substrate. At the same time, it can fill the parts of underground buildings, tunnel projects and bridge projects that require structural deformation, displacement, etc., including settlement joints and expansion joints, to form an excellent sealing effect to prevent moisture penetration; nano-silicon dioxide further improves the water resistance of the material through nano-level filling, so that the grouting material can still maintain stable bonding properties in a long-term humid or underwater environment, and is suitable for application in humid environments such as underground projects and tunnels. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 The figure is a flow chart of the method of the present invention. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the specification of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] Please see attached Figure 1 Example 1: Preparation of high-flexibility reinforced polymer grouting material Step 1: Preparation of modified epoxy resin emulsion A 25% mass fraction of bisphenol A end-blocked epoxy resin emulsion was added to the reactor, the molecular weight was controlled at about 3000, and 5% mass fraction of aminosilane was introduced for end-group modification. The modification process was stirred at 60°C for 40 minutes to ensure that the epoxy resin and the modifier were evenly dispersed. The modified epoxy resin emulsion provided the basic bonding performance of the system, and its bonding ability with various substrates was enhanced by aminosilane.

[0031] Step 2: Addition of acrylic emulsion Acrylic emulsion was added at a mass fraction of 30%, the mass ratio of acrylic acid to methacrylate was 1:2, the stirring speed was 500 rpm, and the stirring was continued for 1 hour. Acrylic emulsion and epoxy resin emulsion work synergistically to ensure that the material maintains high flexibility and ductility under high strain conditions.

[0032] Step 3: Addition of nanofillers and bentonite Add 2% of nano-silica into the system, with a particle size of 50nm and surface modified with vinyl triethoxysilane. Use a high shear mixer to stir at 3000rpm for 30 minutes. Then add 5% of sodium bentonite, stirring at 1000rpm for 30 minutes. Bentonite absorbs water and swells in the system, filling the micropores of the material and improving the sealing performance.

[0033] Step 4: Addition of high elasticity additives and crosslinking agents Add 4% by mass of polyurethane modified siloxane high elastic additive, the molecular weight is controlled at 5000 Dalton, the stirring speed is 600rpm, and the stirring is continued for 30 minutes. Add 5% by mass of bifunctional crosslinking agent (polyethylene glycol diglycidyl ether) to promote the formation of network structure in the system and ensure that the material has high ductility and strong bonding properties.

[0034] Step 5: Addition of initiator and accelerator and curing 0.5% potassium persulfate as an initiator and 0.2% N,N-dimethylaniline as an accelerator were added in sequence and stirred evenly. The mixture was left to stand at room temperature for 4 hours for preliminary curing. Subsequently, the temperature was raised to 35°C and the curing was continued for 12 hours to form a multi-level cross-linked structure.

[0035] Summary: The grouting material prepared in this embodiment forms a composite material with high flexibility and strong adhesion by combining modified epoxy resin with a high elasticity additive, which is particularly suitable for deformation joint repair projects requiring high ductility and good adhesion.

[0036] Example 2: Preparation of highly water-resistant and crack-resistant polymer grouting material Step 1: Preparation of modified epoxy resin emulsion 30% of bisphenol A epoxy resin was dissolved in acrylic emulsion, the molecular weight was controlled at 4000, and the temperature was controlled at 60°C. 4% of hydroxyl compound was introduced as the end group modifier, and the stirring speed was 400rpm for 30 minutes. The addition of hydroxyl compound can increase the chemical reaction activity between epoxy resin and substrate, especially enhance the bonding strength in a humid environment.

[0037] Step 2: Addition of high elasticity additives Add 3% by mass of polyurethane modified siloxane high elastic additive with a molecular weight of 7000 Daltons and continue stirring for 40 minutes. The additive and epoxy resin form a flexible network structure, which improves the flexibility and fatigue resistance of the grouting material.

[0038] Step 3: Addition of nanofillers and bentonite 1% nano-silicon dioxide was added, the particle size was controlled at 30nm, and the surface was treated with aminosilane to enhance its dispersibility and bonding with epoxy resin. Subsequently, 7% sodium bentonite was added and stirred for 30 minutes. Bentonite swells in a water environment, significantly enhancing the grouting material's anti-permeability and water resistance.

[0039] Step 4: Addition of initiator and accelerator 1% benzoyl peroxide is added as an initiator to promote the free radical polymerization reaction of the system. Then 0.3% N,N-dimethylaniline is added as an accelerator, which is particularly suitable for construction environments under low temperature conditions. This combination allows the grouting material to quickly solidify and form a stable structure under low temperature and humid conditions.

[0040] Step 5: Curing Process The mixture was left at room temperature for 4 hours to initially solidify and form an initial cross-linked network. The temperature was then raised to 40°C and the curing continued for 8 hours. This curing process ensured that the grouting material formed a uniform bonding layer on the surface of various substrates and improved the material's crack resistance.

[0041] Summary: The grouting material prepared in this embodiment focuses on improving the water resistance and crack resistance of the material, is suitable for sealing and repairing in humid environments and high-moisture environments, and is particularly suitable for underground projects and waterproof facilities.

[0042] Example 3: Preparation of high-adhesion performance optimized polymer grouting material Step 1: Preparation of modified epoxy resin emulsion Mix 20% by mass of bisphenol A type end-blocked epoxy resin emulsion with acrylic emulsion (40% by mass), with a molecular weight of 4500. Add 5% by mass of terminal hydroxyl compound for modification, stir at 500 rpm, keep the temperature at 60°C, and continue stirring for 1 hour.

[0043] Step 2: Addition of acrylic emulsion and high elasticity additive Add 5% acrylic emulsion by mass, with a mass ratio of acrylic acid to methacrylate of 1:1. Then add 3% polyurethane modified siloxane additive with a molecular weight of 6000, stir at 600 rpm, and continue stirring for 30 minutes. The introduction of acrylic emulsion further improves the ductility of the material and its compatibility with a variety of substrates.

[0044] Step 3: Dispersion of Nanofiller and Bentonite 1% nano-silicon dioxide was added, with a particle size of 40nm, and the stirring time was 30 minutes. Subsequently, 3% sodium bentonite was added, with a particle size of 120 mesh. The bentonite swelled in water, filling the tiny pores of the material and enhancing the bonding force of the grouting material.

[0045] Step 4: Addition of initiator and accelerator 1% potassium persulfate was added as an initiator to start the free radical reaction. Subsequently, 0.4% N,N-dimethylaniline was added as an accelerator to accelerate the curing process.

[0046] Step 5: Multi-stage curing The material was left at room temperature for 4 hours to complete the initial curing. Then, the temperature was raised to 35°C and the curing continued for 12 hours to ensure that the grouting material formed a stable multi-level cross-linked structure, improving its adhesion and durability.

[0047] Summary: This embodiment further improves the bonding performance of the material through multi-level cross-linking structure and nanofiller dispersion optimization, and is particularly suitable for complex engineering environments that require high bonding strength, including bridge repair and structural reinforcement.

[0048] Summary The three different embodiments provided by the present invention respectively focus on different performance optimization directions of the grouting material. Embodiment 1 significantly improves the flexibility and ductility of the material through the synergistic effect of high elasticity additives and acrylic emulsions, and is suitable for high strain environments. Embodiment 2 mainly optimizes the water resistance and crack resistance of the material. The use of bentonite greatly enhances the performance of the grouting material in a humid environment, and is particularly suitable for underground and waterproofing projects. Embodiment 3 focuses on the improvement of bonding properties, and adopts a multi-level cross-linked network and optimized dispersion of nanofillers to enhance the bonding ability of the material in complex projects.

[0049] By controlling the proportion of different components and optimizing the process, each embodiment shows excellent performance for specific engineering needs, fully demonstrating the innovation and wide applicability of the present invention in the field of polymer grouting materials.

[0050] Comparative experiment 1: Elongation and bonding strength comparison experiment Existing technical solutions Cement-based grouting material: Traditional cement-based grouting material uses ordinary Portland cement as the main component, which has high compressive strength, but low elongation and weak bonding performance, and is prone to cracking, especially under dynamic load conditions.

[0051] Epoxy resin-based grouting material: Epoxy resin-based grouting material has high bonding strength and is particularly suitable for static stress environments, but it has strong rigidity, insufficient ductility and deformation resistance, and is prone to cracking, especially under high strain conditions.

[0052] Technical solution of the present invention The polymer grouting material of the invention has good flexibility and high adhesive force by adding acrylic emulsion, high elasticity auxiliary agent and modified epoxy resin, and is particularly suitable for conditions of high strain and dynamic load.

[0053] Experimental Procedure Sample preparation: Standard samples (size 50mm × 10mm × 5mm) were prepared for each grouting material and then cured.

[0054] Elongation test: Each sample was stretched on a tensile testing machine at a speed of 50 mm / min until it broke, and the lengths before and after stretching were recorded.

[0055] Bond strength test: The grouting material is applied to concrete, metal and wood substrates respectively on the bond strength testing machine, and the bond strength test is carried out after curing.

[0056] Experimental data table Grouting material type Elongation(%) Concrete bond strength (MPa) Metal bonding strength (MPa) Wood bonding strength (MPa) Cement-based grout 0.5 1.5 1.0 0.8 Epoxy resin based grout 2.0 3.5 3.8 3.0 Polymer grouting material of the present invention 200 3.2 3.5 3.3 Experimental results analysis The polymer grouting material of the present invention has outstanding performance in elongation, reaching 200%, which is far superior to cement-based and epoxy resin-based grouting materials, and can effectively adapt to the deformation of the substrate without cracking.

[0057] In terms of bonding strength, the present invention performs similarly to epoxy resin-based grouting materials, but the present invention has better flexibility and ductility and can maintain higher bonding strength under dynamic loads and high strain environments.

[0058] Comparative experiment 2: Water resistance comparison experiment Existing technical solutions Cement-based grouting material: Cement-based grouting material is easily corroded in a long-term water immersion environment, resulting in a decrease in bonding performance.

[0059] Epoxy resin-based grouting material: The performance of epoxy resin-based grouting material under underwater conditions is relatively stable, but it has high rigidity and is prone to interface failure under long-term stress.

[0060] Technical solution of the present invention The polymer grouting material of the invention significantly enhances the water resistance of the grouting material by adding sodium bentonite and nano silicon dioxide, and can maintain good bonding performance and sealing performance in a humid or underwater environment.

[0061] Experimental Procedure Sample preparation: Standard sample blocks (size 50mm × 10mm × 5mm) were prepared for each grouting material and then cured.

[0062] Water immersion treatment: Soak the cured specimen in water for 72 hours and then take it out for bonding strength test.

[0063] Bond strength test: Apply the grouting material to concrete, metal and wood substrates respectively, and perform the bond strength test after curing, and record the change of bond strength before and after immersion.

[0064] Experimental data table Grouting material type Bond strength before immersion (MPa) Bond strength after immersion (MPa) Bond strength retention rate (%) Cement-based grout 1.5 0.8 53.3 Epoxy resin based grout 3.8 2.9 76.3 Polymer grouting material of the present invention 3.5 3.2 91.4 Experimental results analysis The bonding strength retention rate of the polymer grouting material of the present invention after immersion reaches 91.4%, which is much better than 53.3% of cement-based grouting material and significantly better than 76.3% of epoxy resin-based grouting material.

[0065] The results show that the grouting material of the present invention has stronger water resistance in an underwater environment, can effectively resist water erosion, and maintain a high bonding strength.

[0066] Comparative experiment 3: Fatigue resistance and crack resistance comparison experiment Existing technical solutions Cement-based grouting materials: Cement-based grouting materials have poor crack resistance under dynamic loads, and long-term fatigue loads will lead to cracking and bonding failure.

[0067] Epoxy resin-based grouting materials: Epoxy resin-based grouting materials have high strength under static loads, but are prone to brittle fracture and lack flexibility under long-term dynamic load conditions.

[0068] Technical solution of the present invention The polymer grouting material of the present invention forms a multi-level cross-linked network structure by introducing a bifunctional cross-linking agent, which significantly enhances the fatigue resistance and crack resistance of the material and is particularly suitable for long-term dynamic load conditions.

[0069] Experimental Procedure Sample preparation: Standard sample blocks (size 50mm × 10mm × 5mm) were prepared for each grouting material and then cured.

[0070] Dynamic fatigue test: Each grouting material was subjected to 200,000 cycles of loading (loading frequency was 1 Hz) on a dynamic fatigue testing machine, and the crack generation and fracture time of the specimens were recorded.

[0071] Crack resistance test: Detect the surface cracks of different grouting materials before and after fatigue loading, and record the crack width and number.

[0072] Experimental data table Grouting material type Number of load cycles Crack width(mm) Number of cracks Break time (hours) Cement-based grout 50,000 0.8 5 12 Epoxy resin based grout 100,000 0.5 3 50 Polymer grouting material of the present invention 200,000 0.2 1 100 Experimental results analysis The polymer grouting material of the present invention only produces very fine cracks after 200,000 cycles of loading, and the number of cracks is only one, and the crack width is 0.2 mm, showing excellent crack resistance.

[0073] Compared with cement-based and epoxy resin-based grouting materials, the present invention exhibits a significantly longer fracture time (100 hours) in a dynamic fatigue test, indicating that it has excellent fatigue resistance.

[0074] Summarize Through three groups of comparative experiments, the polymer grouting material of the present invention has shown significant advantages in elongation, bonding strength, water resistance, fatigue resistance and crack resistance. Compared with traditional cement-based grouting materials and epoxy resin-based grouting materials, the grouting material of the present invention not only has higher flexibility and bonding performance, but also has more outstanding water resistance in humid environments and fatigue resistance under long-term use, which can meet the engineering needs in high-strain and complex environments.

[0075] Although 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 appended claims and their equivalents.

Claims

1. A polymer grouting material with high elongation and strong bonding strength, characterized in that: The grouting material comprises the following components in percentage by weight: 5% - 30% modified epoxy resin emulsion, 10% - 40% acrylic emulsion, 1% - 10% sodium bentonite, 0.5% - 5% nano silicon dioxide, 1% - 5% high elasticity additive, 0.1% - 5% initiator, 0.1% - 3% accelerator, 2%-8% bifunctional crosslinker, Deionized water was used as solvent.

2. A polymer grouting material with high elongation and strong bonding force according to claim 1, characterized in that: The modified epoxy resin emulsion is a bisphenol A type epoxy resin with closed end groups, a molecular weight of 2500-5000, and is modified by introducing terminal aminosilane or hydroxyl groups.

3. The polymer grouting material with high elongation and strong bonding force according to claim 1, characterized in that: The acrylic emulsion comprises a copolymer of acrylic acid and methacrylate, wherein the mass ratio of acrylic acid to methacrylate is 1:1 to 1:3, and contains 5%-10% of a hydroxy acrylic monomer.

4. The polymer grouting material with high elongation and strong bonding force according to claim 1, characterized in that: The particle size of the nano silicon dioxide is 20nm to 100nm, and the surface is modified by vinyl triethoxysilane to enhance its dispersibility in the polymer matrix and its adhesion to the substrate.

5. The polymer grouting material with high elongation and strong bonding force according to claim 1, characterized in that: The high elasticity auxiliary agent is a polyurethane modified silicone elastomer with a molecular weight of 3000-8000 Daltons, and can form a flexible network with the epoxy resin emulsion through a cross-linking reaction.

6. The polymer grouting material with high elongation and strong bonding force according to claim 1, characterized in that: The particle size of the sodium bentonite is 100-150 meshes, and its water absorption expansion rate is not less than 100%, which can significantly improve the impermeability and volume stability of the grouting material.

7. The polymer grouting material with high elongation and strong bonding force according to claim 1, characterized in that: The bifunctional cross-linking agent is polyethylene glycol diglycidyl ether, with a molecular weight of 400-600 and a mass fraction of 2%-8%, and is used to control the cross-linking density of the grouting material and enhance the material's crack resistance and bonding strength.

8. The polymer grouting material with high elongation and strong bonding force according to claim 1, characterized in that: The initiator is potassium persulfate or benzoyl peroxide, the accelerator is N,N-dimethylaniline, and the accelerator is added in an amount of 0.1%-3% to accelerate the curing reaction of the system, especially under low temperature or humid conditions, to ensure rapid curing of the material.

9. The polymer grouting material with high elongation and strong bonding force according to claim 1, characterized in that: The grouting material has excellent elongation performance after curing and maintains high bonding strength in a humid environment. It can adapt to the surfaces of various substrates, including concrete, metal and wood, and provide reliable bonding effects on these substrates. At the same time, it has good aging resistance and fatigue resistance.

10. A method for preparing a polymer grouting material with high elongation and strong adhesion, The polymer grouting material with high elongation and strong adhesion according to claims 1-9 is characterized in that: The following steps are involved: (1) The modified epoxy resin emulsion and the acrylic emulsion were mixed in proportion and stirred at 60° C. for 40 minutes; (2) adding a high elasticity additive to the mixture obtained in step (1) and continuing stirring for 60 minutes; (3) Add nano-silica and bentonite to the system of step (2), and stir with a high shear mixer for 30 minutes to ensure uniform dispersion; (4) adding an initiator and a promoter to the system obtained in step (3) and stirring evenly; (5) leaving the system at room temperature for 4 hours for preliminary curing; (6) Secondary curing is carried out at 35°C for 12 h to form a multi-level cross-linked network.

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