High-strength polymer composite metal repairing agent and preparation method thereof

Abstract

The invention relates to the technical field of material science and engineering, and particularly discloses a high-strength polymer composite metal repairing agent and a preparation method thereof. The nano reinforced phase is selected from one or more of a carbon nano tube, graphene and nano silicon dioxide; according to the invention, the nano reinforced phase is added into the repairing agent, and the nano reinforced phase is uniformly dispersed in the polymer matrix material through ultrasonic dispersion and high-speed shear dispersion technologies to form a nano reinforced network structure, and the nano reinforced network structure can significantly improve the tensile strength and elongation at break of the repairing agent; the repairing agent can bear larger mechanical stress and impact and is suitable for various repairing scenes with high strength requirements, the mechanical property of the repairing agent is enhanced, the crack propagation resistance of the repairing agent is improved, the service life of the repairing agent after repairing is prolonged, and the risk of secondary damage caused by insufficient material strength is reduced.

Description

Technical Field

[0001] The invention belongs to the field of material science and engineering technology, and specifically relates to a high-strength polymer composite metal repair agent and a preparation method thereof. Background Art

[0002] In the field of materials science and engineering technology, the research and development of polymer composite materials has always been one of the research hotspots. With the rapid development of industrial production, the performance requirements of materials are increasing day by day, especially in the repair and maintenance of metal equipment. Traditional repair methods such as welding and machining can no longer meet the needs of efficient, convenient and high-strength repair. In recent years, polymer composite materials, as a new type of repair material, have gradually attracted widespread attention due to their good mechanical properties, corrosion resistance, easy processing and other advantages.

[0003] However, the existing polymer composite metal repair agents still have some shortcomings in performance, especially in application scenarios with high strength requirements. Traditional polymer composite materials often find it difficult to achieve ideal repair effects. This is mainly due to the uneven dispersion of the reinforcing phase in traditional materials, which cannot form an effective reinforcing network structure, resulting in limited tensile strength and elongation at break of the repair agent, making it difficult to meet the requirements of high strength and high toughness. In addition, traditional repair agents also have certain limitations in corrosion resistance and conductivity, making them difficult to be effectively used in corrosive environments and in situations where conductivity is required. Therefore, staff need to improve them. Summary of the invention

[0004] The object of the present invention is to provide a high-strength polymer composite metal repair agent and a preparation method thereof to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A high-strength polymer composite metal repair agent, comprising the following components:

[0007] Polymer matrix material: 30-70wt%;

[0008] Nano-enhanced phase: 1-20wt%, the nano-enhanced phase is selected from one or more of carbon nanotubes, graphene, and nano-silicon dioxide;

[0009] Metal powder: 10-50wt%, the metal powder is selected from one or more of aluminum powder, copper powder, iron powder and nickel powder;

[0010] Curing agent: 5-15wt%;

[0011] Auxiliary agent: 1-10wt%, the auxiliary agent includes one or more of a dispersant, a toughening agent, and an antioxidant;

[0012] The nano-enhanced phase is uniformly dispersed in the polymer matrix material to form a nano-enhanced network structure. The metal powder is tightly combined with the polymer matrix material through the nano-enhanced network structure. The tensile strength of the repair agent is 50-200MPa and the elongation at break is 5-20%.

[0013] Preferably, the polymer matrix material is one or more of epoxy resin, polyurethane and acrylic resin.

[0014] Preferably, the nano-reinforced phase is a carbon nanotube with a diameter of 1-50 nm and a length of 1-20 μm, and the surface of the carbon nanotube is treated with carboxylation, amination, or hydroxylation.

[0015] Preferably, the nano-enhanced phase is graphene, the thickness of the lamellae is 0.5-5 nm, the size of the lamellae is 1-10 μm, and the surface of the graphene is oxidized and modified with a silane coupling agent.

[0016] Preferably, the particle size of the metal powder is 1-100 μm, and the surface of the metal powder is treated with a silane coupling agent, and the silane coupling agent is γ-aminopropyltriethoxysilane or γ-glycidyloxypropyltrimethoxysilane.

[0017] Preferably, the curing agent is an amine curing agent, an acid anhydride curing agent, or an imidazole curing agent, and the mass ratio of the curing agent to the polymer matrix material is 1:5 to 1:10.

[0018] Preferably, the auxiliary agent includes:

[0019] Dispersant: 0.1-5wt%, the dispersant is polyethylene glycol, polyvinyl pyrrolidone;

[0020] Toughening agent: 0.5-5wt%, the toughening agent is rubber particles, thermoplastic elastomer;

[0021] Antioxidant: 0.1-2wt%, the antioxidant is a hindered phenol or phosphite antioxidant.

[0022] A method for preparing a high-strength polymer composite metal repair agent comprises the following steps:

[0023] S1. Mix the polymer matrix material and the additive, and stir at 50-80°C until uniform to obtain a premix;

[0024] S2, adding the nano-reinforced phase to the premix, and dispersing the nano-reinforced phase uniformly in the polymer matrix material through ultrasonic dispersion and high-speed shear dispersion to form a nano-reinforced network structure;

[0025] S3, adding metal powder to the mixture obtained in S2, and continuing to stir until uniform;

[0026] S4. Add curing agent and stir evenly to obtain a high-strength polymer composite metal repair agent.

[0027] Preferably, in step S2, the frequency of ultrasonic dispersion is 20-40 kHz, and the time is 10-60 minutes; the rotation speed of high-speed shear dispersion is 1000-5000 rpm, and the time is 10-30 minutes.

[0028] Preferably, in step S4, the curing agent is added at a temperature of 20-40° C., the stirring time is 5-15 minutes, and the curing reaction is carried out at room temperature to 80° C., and the curing time is 1-24 hours.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] (1) By adding a nano-reinforced phase to the repair agent and using ultrasonic dispersion and high-speed shear dispersion technology to uniformly disperse it in the polymer matrix material to form a nano-reinforced network structure, the nano-reinforced network structure can significantly improve the tensile strength and elongation at break of the repair agent, enabling it to withstand greater mechanical stress and impact, and is suitable for various repair scenarios with high-strength requirements. It not only enhances the mechanical properties of the repair agent, but also improves its ability to resist crack propagation, prolongs its service life after repair, and reduces the risk of re-damage due to insufficient material strength.

[0031] (2) By adding metal powder to the repair agent and closely combining it with the polymer matrix material through a nano-enhanced network structure, the addition of metal powder not only further enhances the mechanical properties of the repair agent, but also gives it good corrosion resistance and conductivity, allowing it to be used in corrosive environments and occasions requiring conductivity, thereby expanding the application range of the repair agent and improving its service life in harsh environments. At the same time, it meets the conductivity requirements of specific occasions, such as the repair of electrical equipment.

[0032] (3) Adding additives to the repair agent can improve the processing performance and long-term stability of the repair agent. Dispersants help to evenly disperse the nano-reinforced phase in the polymer matrix material, thereby improving the uniformity of the repair agent; toughening agents can improve the toughness and impact resistance of the repair agent, preventing it from cracking when impacted; antioxidants can prevent the repair agent from aging due to oxidation during long-term use, thereby extending its service life. This not only improves the processing performance of the repair agent, making it easier to prepare and apply, but also ensures the stability and reliability of the repair agent during long-term use, thereby reducing the risk of performance degradation due to aging. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a preparation flow chart of the present invention. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments 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.

[0035] Embodiment 1:

[0036] See also Figure 1 As shown, a high-strength polymer composite metal repair agent includes the following components:

[0037] Polymer matrix material: 30-70wt%, the polymer matrix material is epoxy resin, polyurethane, acrylic resin;

[0038] Nano-enhanced phase: 1-20wt%, the nano-enhanced phase is selected from carbon nanotubes, graphene, and nano-silicon dioxide;

[0039] Metal powder: 10-50wt%, the metal powder is selected from aluminum powder, copper powder, iron powder, and nickel powder;

[0040] Curing agent: 5-15wt%, the curing agent is an amine curing agent, an acid anhydride curing agent, or an imidazole curing agent;

[0041] Auxiliary agent: 1-10wt%, the auxiliary agent includes dispersant, toughening agent, antioxidant;

[0042] Dispersant: 0.1-5wt%, the dispersant is polyethylene glycol, polyvinyl pyrrolidone;

[0043] Toughening agent: 0.5-5wt%, the toughening agent is rubber particles, thermoplastic elastomer;

[0044] Antioxidant: 0.1-2wt%, the antioxidant is a hindered phenol or phosphite antioxidant.

[0045] The nano-enhanced phase is evenly dispersed in the polymer matrix material to form a nano-enhanced network structure. The metal powder is tightly combined with the polymer matrix material through the nano-enhanced network structure. The tensile strength of the repair agent is 50-200MPa and the elongation at break is 5-20%.

[0046] Selection of polymer matrix materials:

[0047] Epoxy resin: Use bisphenol A epoxy resin with an epoxy value of 0.4-0.6eq / 100g;

[0048] Polyurethane: Use polyether polyurethane with a molecular weight of 2000-5000g / mol;

[0049] Acrylic resin: Methyl methacrylate copolymer is selected, and the glass transition temperature is 50-80°C.

[0050] Selection and treatment of nano-reinforced phase:

[0051] Carbon nanotubes: 1-50nm in diameter, 1-20μm in length, with surface functionalization treatments such as carboxylation, aminoation, and hydroxylation;

[0052] Graphene: The sheet thickness is 0.5-5nm, the sheet size is 1-10μm, and the surface is oxidized and modified with silane coupling agent;

[0053] Nano-silicon dioxide: particle size is 10-100nm, and the surface is treated with silane coupling agent.

[0054] Selection and processing of metal powder:

[0055] The particle size of the metal powder is 1-100 μm, and the surface is treated with a silane coupling agent, wherein the silane coupling agent is gamma-aminopropyl triethoxysilane or gamma-glycidyloxypropyl trimethoxysilane.

[0056] Choice of curing agent:

[0057] Amine curing agent: ethylenediamine and diethylenetriamine are selected;

[0058] Anhydride curing agent: phthalic anhydride and tetrahydrophthalic anhydride;

[0059] Imidazole curing agent: 2-ethyl-4-methylimidazole is selected.

[0060] Choice of additives:

[0061] Dispersant: polyethylene glycol (molecular weight 1000-5000 g / mol), polyvinyl pyrrolidone (molecular weight 10000-50000 g / mol);

[0062] Toughening agent: rubber particles (particle size 1-10 μm), thermoplastic elastomer (such as styrene-butadiene-styrene block copolymer);

[0063] Antioxidants: hindered phenols (such as 2,6-di-tert-butyl-p-cresol), phosphites (such as tris(2,4-di-tert-butylphenyl)phosphite).

[0064] Embodiment 2:

[0065] See also Figure 1As shown, a method for preparing a high-strength polymer composite metal repair agent comprises the following steps:

[0066] S1: Preparation of premix

[0067] Mix the polymer matrix material and the additive, and stir at 50-80°C until uniform to obtain a premix;

[0068] The stirring speed is 500-1000 rpm and the stirring time is 10-30 minutes.

[0069] S2: Dispersion of the Nano-Reinforced Phase

[0070] The nano-reinforced phase is added to the premix, and the nano-reinforced phase is evenly dispersed in the polymer matrix material through ultrasonic dispersion and high-speed shear dispersion to form a nano-reinforced network structure;

[0071] The frequency of ultrasonic dispersion is 20-40kHz and the time is 10-60 minutes;

[0072] The speed of high-speed shear dispersion is 1000-5000 rpm, and the time is 10-30 minutes.

[0073] S3: Addition of metal powder

[0074] Add the metal powder to the mixture obtained in step S2, and continue stirring until it is uniform;

[0075] The stirring speed is 500-1000 rpm and the stirring time is 10-30 minutes.

[0076] S4: Addition of curing agent and curing

[0077] Add curing agent and stir evenly to obtain high-strength polymer composite metal repair agent;

[0078] The curing agent is added at a temperature of 20-40°C and the stirring time is 5-15 minutes;

[0079] The curing reaction is carried out at room temperature to 80°C, and the curing time is 1 to 24 hours.

[0080] Ultrasonic dispersion: Use an ultrasonic cleaner with a frequency of 20-40kHz, a power of 100-500W, and a dispersion time of 10-60 minutes.

[0081] High-speed shear dispersion: Use a high-speed shear disperser with a rotation speed of 1000-5000rpm and a dispersion time of 10-30 minutes.

[0082] Curing reaction: The curing temperature is from room temperature to 80°C, and the curing time is 1-24 hours. During the curing process, pressure (such as 0.1-1MPa) can be applied as needed to improve the density of the repair agent.

[0083] Embodiment three:

[0084] See also Figure 1 As shown, in order to verify the performance of the high-strength polymer composite metal repair agent, the following comparative test was carried out. In the test, three different formulas of repair agents were prepared, and their tensile strength, elongation at break, heat resistance and corrosion resistance were tested.

[0085] Test materials and formulations

[0086] Formula 1 (present embodiment):

[0087] Polymer matrix material: epoxy resin, 50wt%;

[0088] Nano-reinforced phase: carbon nanotubes, 10 wt% (diameter 10 nm, length 10 μm, surface carboxylation treated);

[0089] Metal powder: aluminum powder, 30wt% (particle size 50μm, surface treated with silane coupling agent);

[0090] Curing agent: amine curing agent, 8wt%;

[0091] Additives: dispersant (polyethylene glycol, 2wt%), toughening agent (rubber particles, 3wt%), antioxidant (hindered phenols, 1wt%);

[0092] Formula 2 (Comparison Formula 1):

[0093] Polymer matrix material: epoxy resin, 50wt%;

[0094] Nano-enhanced phase: None;

[0095] Metal powder: aluminum powder, 30wt%;

[0096] Curing agent: amine curing agent, 8wt%;

[0097] Additives: dispersant (polyethylene glycol, 2wt%), toughening agent (rubber particles, 3wt%), antioxidant (hindered phenols, 1wt%);

[0098] Formula 3 (Comparison Formula 2):

[0099] Polymer matrix material: epoxy resin, 50wt%;

[0100] Nano-reinforced phase: carbon nanotubes, 10wt%;

[0101] Metal powder: None;

[0102] Curing agent: amine curing agent, 8wt%;

[0103] Additives: dispersant (polyethylene glycol, 2wt%), toughening agent (rubber particles, 3wt%), antioxidant (hindered phenols, 1wt%)

[0104] Preparation method: According to the preparation method described in Example 2, repair agents of Formula 1, Formula 2 and Formula 3 were prepared respectively.

[0105] Performance Testing

[0106] Tensile strength and elongation at break test: The three formulas of repair agents were tested for tensile strength and elongation at break using a universal material testing machine. The results are as follows:

[0107] formula Tensile strength(MPa) Elongation at break (%) Recipe 1 180 16 Recipe 2 120 11 Recipe 3 90 7

[0108] Heat resistance test: The three formulas of patch samples were placed in a constant temperature box at 150°C for 24 hours, and their appearance changes were observed and their tensile strength retention rates were tested. The results are as follows:

[0109] formula Appearance Changes Tensile strength retention rate (%) Recipe 1 No significant changes 94 Recipe 2 Slight discoloration 83 Recipe 3 Obvious discoloration 74

[0110] Corrosion resistance test: The three formulas of repair agent samples were immersed in 5% NaCl solution for 7 days, and their appearance changes were observed and their tensile strength retention was tested. The results are as follows:

[0111] formula Appearance Changes Tensile strength retention rate (%) Recipe 1 No significant changes 91 Recipe 2 Slight corrosion 77 Recipe 3 Obvious corrosion 68

[0112] It can be seen from the above test data that Formulation 1 (this embodiment) exhibits excellent performance in tensile strength, elongation at break, heat resistance and corrosion resistance. Formulation 2 has significantly reduced mechanical properties and heat resistance due to the lack of nano-reinforced phase; Formulation 3 has poor mechanical properties and corrosion resistance due to the lack of metal powder.

[0113] Embodiment 4:

[0114] See also Figure 1 As shown, in industrial production, metal equipment (such as pipelines, storage tanks, mechanical equipment, etc.) often have cracks, holes or local damage due to corrosion, wear or mechanical damage. Traditional repair methods such as welding and machining are not only costly and time-consuming, but may also cause secondary damage to the equipment. Therefore, it is of great significance to develop an efficient, convenient repair agent with excellent mechanical properties.

[0115] This high-strength polymer composite metal repair agent has excellent tensile strength, elongation at break, heat resistance and corrosion resistance, and can be widely used in the repair and maintenance of industrial equipment.

[0116] Application Scenario

[0117] Pipeline repair: In the petroleum, chemical, natural gas and other industries, pipelines are in high temperature, high pressure and corrosive environments for a long time, and are prone to cracks or corrosion perforations. The use of the high-strength polymer composite metal repair agent of this application can quickly repair pipeline damage and restore its sealing and strength.

[0118] Tank repair: During long-term use, storage tanks (such as oil tanks and chemical storage tanks) may be partially damaged due to corrosion or mechanical damage. The use of the repair agent of this application for repair can not only restore the structural integrity of the tank, but also effectively prevent further corrosion.

[0119] Mechanical equipment repair: Mechanical equipment (such as gears, bearings, pump bodies, etc.) may be partially damaged due to wear or impact during operation. Using the repair agent of this application for repair can quickly restore the operating performance of the equipment and extend its service life.

[0120] Application steps

[0121] Surface treatment: Before repair, first treat the damaged part to ensure that the surface is clean, dry, free of oil and rust. Sandpaper or sandblasting can be used to increase the surface roughness and improve the adhesion of the repair agent.

[0122] Healing agent coating: The high-strength polymer composite metal healer is prepared according to the preparation method of Example 2, and then evenly coated on the damaged part. For larger cracks or holes, a scraper or a syringe can be used to fill the healer into the damaged part.

[0123] Curing: After the repair agent is applied, select appropriate curing conditions according to actual needs. Generally, the repair agent can reach a high strength after curing at room temperature for 1-24 hours. For occasions where rapid curing is required, it can be heated to 80°C to shorten the curing time.

[0124] Post-treatment: After curing, the repaired part can be polished with sandpaper or a grinder to make its surface flat and smooth. If necessary, a secondary coating or spraying of a protective coating can be performed to further improve the corrosion resistance and aesthetics of the repaired part.

[0125] Mechanical properties: The equipment repaired with the high-strength polymer composite metal repair agent in this application has a tensile strength of up to 180MPa and an elongation at break of 15%, which can effectively withstand the mechanical stress and impact during equipment operation.

[0126] Heat resistance: After the repair agent is kept at 150°C for 24 hours, the tensile strength retention rate is still as high as 95%, indicating that it has excellent heat resistance and is suitable for equipment repair in high temperature environments.

[0127] Corrosion resistance: After the repair agent was immersed in 5% NaCl solution for 7 days, the tensile strength retention rate was 90%, indicating that it has good corrosion resistance and is suitable for equipment repair in corrosive environments.

[0128] Working principle: The main components of the repair agent include polymer matrix material, nano-reinforcement phase, metal powder, curing agent and additives. These components are combined with each other through specific process steps during the preparation process to form a composite material with high strength, high toughness, good heat resistance and corrosion resistance.

[0129] Polymer matrix material: As the basis of the repair agent, the polymer matrix material provides the necessary strength and toughness. During the preparation process, the polymer matrix material is mixed with the additives and stirred until uniform at a certain temperature to form a premix to ensure sufficient mixing between the polymer matrix material and the additives, providing a good foundation for the chemical reaction and physical bonding in the subsequent steps.

[0130] Nano-reinforced phase: The nano-reinforced phase, such as carbon nanotubes, graphene or nano-silica, is uniformly dispersed in the polymer matrix material to form a nano-reinforced network structure. The nano-reinforced network structure can significantly improve the strength and toughness of the repair agent while increasing its ability to resist crack propagation. The surface of the nano-reinforced phase is functionalized, such as carboxylation, amination, hydroxylation or silane coupling agent modification, to enhance its bonding with the polymer matrix material.

[0131] Metal powder: The addition of metal powder further enhances the mechanical properties and corrosion resistance of the repair agent. The metal powder is tightly combined with the polymer matrix material through the nano-enhanced network structure to form a composite structure, which not only improves the strength of the repair agent, but also gives it good electrical and thermal conductivity. The surface of the metal powder is also treated with a silane coupling agent to improve its compatibility and bonding with the polymer matrix material.

[0132] Curing agent: The addition of curing agent causes the repair agent to undergo a curing reaction at room temperature to 80°C to form a stable three-dimensional network structure. This step is a key step in the preparation of the repair agent, which determines the final performance and service life of the repair agent. The type and amount of curing agent have an important influence on the curing speed, curing temperature and performance of the repair agent after curing.

[0133] Additives: Additives, such as dispersants, toughening agents and antioxidants, play an important role in the preparation and curing process of the repair agent. Dispersants help to evenly disperse the nano-reinforced phase in the polymer matrix material; toughening agents can improve the toughness and impact resistance of the repair agent; antioxidants can prevent the repair agent from aging due to oxidation during long-term use.

[0134] To sum up, the high-strength polymer composite metal repair agent of the present application is based on the interaction and combination of polymer matrix material, nano-reinforcement phase, metal powder, curing agent and additives to form a composite material with high strength, high toughness, good heat resistance and corrosion resistance. This repair agent can be widely used in the repair and maintenance of industrial equipment, providing a strong guarantee for the long-term stable operation of the equipment.

[0135] 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 high-strength polymer composite metal repair agent, characterized in that: Includes the following components: Polymer matrix material: 30-70wt%; Nano-enhanced phase: 1-20wt%, the nano-enhanced phase is selected from one or more of carbon nanotubes, graphene, and nano-silicon dioxide; Metal powder: 10-50wt%, the metal powder is selected from one or more of aluminum powder, copper powder, iron powder and nickel powder; Curing agent: 5-15wt%; Auxiliary agent: 1-10wt%, the auxiliary agent includes one or more of a dispersant, a toughening agent, and an antioxidant; The nano-enhanced phase is uniformly dispersed in the polymer matrix material to form a nano-enhanced network structure. The metal powder is tightly combined with the polymer matrix material through the nano-enhanced network structure. The tensile strength of the repair agent is 50-200MPa and the elongation at break is 5-20%.

2. A high-strength polymer composite metal repair agent according to claim 1, characterized in that: The polymer matrix material is one or more of epoxy resin, polyurethane and acrylic resin.

3. The high-strength polymer composite metal repair agent according to claim 1, characterized in that: The nano-enhanced phase is a carbon nanotube with a diameter of 1-50 nm and a length of 1-20 μm, and the surface of the carbon nanotube is subjected to carboxylation, amination and hydroxylation functionalization treatments.

4. The high-strength polymer composite metal repair agent according to claim 1, characterized in that: The nano-enhanced phase is graphene, the thickness of the lamellae is 0.5-5nm, the size of the lamellae is 1-10μm, and the surface of the graphene is oxidized and modified with a silane coupling agent.

5. The high-strength polymer composite metal repair agent according to claim 1, characterized in that: The particle size of the metal powder is 1-100 μm, and the surface of the metal powder is treated with a silane coupling agent, wherein the silane coupling agent is γ-aminopropyltriethoxysilane or γ-glycidyloxypropyltrimethoxysilane.

6. The high-strength polymer composite metal repair agent according to claim 1, characterized in that: The curing agent is an amine curing agent, an acid anhydride curing agent, or an imidazole curing agent, and the mass ratio of the curing agent to the polymer matrix material is 1:5 to 1:

10.

7. The high-strength polymer composite metal repair agent according to claim 1, characterized in that: The auxiliary agent includes: Dispersant: 0.1-5wt%, the dispersant is polyethylene glycol, polyvinyl pyrrolidone; Toughening agent: 0.5-5wt%, the toughening agent is rubber particles, thermoplastic elastomer; Antioxidant: 0.1-2wt%, the antioxidant is a hindered phenol or phosphite antioxidant.

8. A method for preparing a high-strength polymer composite metal repair agent, applicable to a high-strength polymer composite metal repair agent according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1. Mix the polymer matrix material and the additive, and stir at 50-80°C until uniform to obtain a premix; S2, adding the nano-reinforced phase to the premix, and dispersing the nano-reinforced phase uniformly in the polymer matrix material through ultrasonic dispersion and high-speed shear dispersion to form a nano-reinforced network structure; S3, adding metal powder to the mixture obtained in S2, and continuing to stir until uniform; S4. Add curing agent and stir evenly to obtain a high-strength polymer composite metal repair agent.

9. The method for preparing a high-strength polymer composite metal repair agent according to claim 8, characterized in that: In step S2, the frequency of ultrasonic dispersion is 20-40 kHz, and the time is 10-60 minutes; the rotation speed of high-speed shear dispersion is 1000-5000 rpm, and the time is 10-30 minutes.

10. The method for preparing a high-strength polymer composite metal repair agent according to claim 8, characterized in that: In step S4, the curing agent is added at a temperature of 20-40°C, the stirring time is 5-15 minutes, and the curing reaction is carried out at room temperature to 80°C, and the curing time is 1-24 hours.

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