Electromagnetic repair mud iron glue and preparation method thereof

Abstract

The present application relates to the technical field of electromagnetic repair mud iron glue preparation, in particular to an electromagnetic repair mud iron glue and a preparation method thereof, which is composed of component A and component B; the component A includes the following components by mass fraction: epoxy resin 30-50 parts, active diluent 5-15 parts, modified absorbent 30-60 parts, lubricant 5-15 parts, modified organic bentonite 6-10 parts and silane coupling agent 1-3 parts; the component B includes the following components by mass fraction: curing agent 20-50 parts, curing accelerator 1-5 parts, modified absorbent 30-60 parts, kaolin 10-20 parts, flaky graphite 1-5 parts and lubricant 10-20 parts; the modified absorbent in the component A and the component B is obtained by modifying the absorbent through the silane coupling agent, and the silane coupling agent accounts for 1-5 wt% of the mass of the absorbent. The mud iron glue prepared by the present application not only has excellent wave-absorbing performance, but also is easy to be formed and has excellent mechanical properties.

Description

Technical Field

[0001] This invention relates to the field of electromagnetic repair mud and iron adhesive preparation technology, specifically an electromagnetic repair mud and iron adhesive and its preparation method. Background Technology

[0002] Microwave-absorbing materials are fundamental to microwave absorption performance. By using microwave-absorbing materials, signal characteristics can be significantly reduced without altering the target's shape, thus decreasing the likelihood of detection by detection systems. Microwave-absorbing materials are generally classified into coating-type and structural-type materials, and these materials play important roles in military stealth, civilian electromagnetic protection, and electromagnetic interference suppression.

[0003] Despite their excellent electrical properties, microwave absorbing materials inevitably encounter damage during practical applications, especially under extreme temperature variations and harsh environments, making it difficult for them to maintain optimal performance over extended periods. Coating-type microwave absorbing materials can be repaired using existing microwave absorbing sealant technologies (such as CN109517559A). These sealants are mostly liquid or paste-like, which, while easy to apply to damaged areas, have the following drawbacks in practical electromagnetic repair applications: liquid sealants cannot be shaped in three dimensions, tend to flow when applied to vertical surfaces or tops, and are difficult to form a repair layer of a specific shape; the material's filling capacity for defects is insufficient, and for irregular defects (such as cracks and pits), liquid sealants are difficult to fully fill and retain, with solvent evaporation easily leading to surface depressions; liquid sealants require additional support structures to maintain their shape, increasing construction complexity. Structural microwave absorbing materials vary in material composition and have different microwave absorbing structural designs to enhance their absorption performance. However, structural absorbing materials inevitably suffer damage of varying degrees during use. While significant damage can be addressed with direct replacement, minor structural damage necessitates costly replacement. Therefore, there is an urgent need for an electromagnetic repair adhesive and its preparation method that can be applied to different material surfaces, molded into various shapes, and resistant to deformation. This would solve the problems of edge-sealing adhesives' inability to be shaped and insufficient filling capacity, as well as the structural damage issues associated with structural absorbing materials. Summary of the Invention

[0004] The purpose of this invention is to provide an electromagnetic repair mud glue and its preparation method to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: An electromagnetic repair mud adhesive, composed of component A and component B; Component A comprises the following materials by mass parts: 30-50 parts epoxy resin, 5-15 parts reactive diluent, 30-60 parts modified absorbent, 5-15 parts lubricant, 6-10 parts modified organobentonite, and 1-3 parts silane coupling agent; Component B comprises the following materials by mass: 20-50 parts curing agent, 1-5 parts curing accelerator, 30-60 parts modified absorbent, 10-20 parts kaolin, 1-5 parts flake graphite, and 10-20 parts lubricant; The modified absorbent in components A and B is obtained by modifying the absorbent with a silane coupling agent, and the silane coupling agent accounts for 1-5 wt% of the absorbent mass.

[0006] Furthermore, the absorbent is at least one of carbonyl iron powder, iron-silicon-aluminum powder, or iron-silicon-chromium powder; the silane coupling agent directly added to component A and the silane coupling agent used in the modified absorbent are at least one of aminopropyltriethoxysilane, aminopropyltrimethoxysilane, glycidyl ether propyltrimethoxysilane, and vinyltriethoxysilane.

[0007] Furthermore, the lubricant in components A and B is at least one of talc, mica powder, polyamide wax, polyethylene wax, and polyurea.

[0008] Furthermore, the active diluent in component A is one of alkyl glycidyl ether, benzyl glycidyl ether, and isooctyl glycidyl ether.

[0009] Furthermore, the preparation method of the modified organic bentonite includes the following steps: S101. Calcine the organic bentonite at a temperature of 400-600℃ for 1-2 hours to obtain pretreated organic bentonite; S102. Add nano-fumed silica to an ethanol-water solution containing γ-glycidoxypropyltrimethoxysilane and treat continuously for 3-5 hours. Then filter, wash the filtered product with deionized water and dry it at room temperature to constant weight. Disperse the dried product in deionized water to obtain a dispersion. S103. Disperse the pretreated organic bentonite obtained in step S101 into the dispersion in step S102, heat to 70-80℃ and stir at 300-500 rpm for 2-4 hours, then filter, and dry the filtered product at room temperature to constant weight to obtain modified organic bentonite.

[0010] Furthermore, in step S102, the mass ratio of nano-fumed silica, γ-glycidoxypropyltrimethoxysilane, and the aqueous ethanol solution is 1:(0.4-0.6):(80-100); the mass ratio of anhydrous ethanol and deionized water in the aqueous ethanol solution is 9:1; and the concentration of nano-fumed silica treated with the aqueous ethanol solution of γ-glycidoxypropyltrimethoxysilane in the dispersion is 10-20 wt%.

[0011] Furthermore, in step S103, the mass ratio between the pretreated organic bentonite and the dispersion is 1:(4.5-5.5).

[0012] A method for preparing electromagnetic repair putty includes the following steps: S1. At 35-55℃, epoxy resin and reactive diluent are premixed according to the mass ratio, and then silane coupling agent is added and dispersed evenly. Modified organic bentonite, lubricant and modified absorbent are added in sequence and subjected to high-speed shearing at a shearing speed of 1400-1600 rpm. Then, the mixture is stirred at a speed of 200-500 rpm, degassed under vacuum, and filtered through an 80-120 mesh filter to obtain component A. S2. After premixing the curing agent and curing accelerator by mass at 20-40℃, add kaolin, flake graphite, lubricant and modified absorbent in sequence and disperse at high speed at 500-800 rpm. After uniform dispersion, degas under vacuum and filter through an 80-120 mesh screen to obtain component B. S3. Take components A and B in a mass ratio of 1:1, mix and stir until the color is uniform to obtain electromagnetic repair mud and iron glue.

[0013] Compared with the prior art, the beneficial effects of the present invention are: 1. The electromagnetic repair mud adhesive of the present invention has good wave absorption performance in the range of 1GHz to 18GHz, and has temperature resistance, flexibility, mechanical strength and environmental adaptability comparable to thermosetting materials, and has broad application prospects.

[0014] 2. The preparation method of the present invention reduces the use of solvents, is more environmentally friendly, has strong material bonding ability, can be attached to the surface of different materials, and can be shaped into different shapes and structures, and is not easily deformed.

[0015] 3. By adding inorganic fillers such as modified organic bentonite and kaolin, the material has better performance and higher strength. At the same time, through a special dispersion method, the fumed silica located in the interlayer structure of organic bentonite can be better dispersed in the material, further improving the material's performance. Attached Figure Description

[0016] Figure 1The process flow diagram for preparing electromagnetic repair mud and iron adhesive according to the present invention is shown below; Figure 2 This is a process flow diagram for preparing modified organic bentonite according to the present invention. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Please see Figures 1 to 2 The present invention provides: Example 1 An electromagnetic repair mud adhesive, composed of component A and component B; Component A comprises the following components by weight: 40 parts epoxy resin, 10 parts reactive diluent, 45 parts modified absorbent, 10 parts lubricant, 8 parts modified organobentonite, and 2 parts silane coupling agent. Component B comprises the following materials by weight: 40 parts curing agent, 3 parts curing accelerator, 45 parts modified absorbent, 15 parts kaolin, 3 parts flake graphite and 15 parts lubricant. The preparation method of the above-mentioned modified organobentonite includes the following steps: S101. Calcine 10 parts of organic bentonite at 500℃ for 1.5h to obtain pretreated organic bentonite; S102. Ten parts of nano-fumed silica were added to an ethanol-water solution containing γ-glycidoxypropyltrimethoxysilane. The amounts of γ-glycidoxypropyltrimethoxysilane and the ethanol-water solution were 5 parts and 900 parts, respectively. The mass ratio of anhydrous ethanol to deionized water in the ethanol-water solution was 9:1. The mixture was treated continuously for 4 hours, then filtered. The filtered product was washed with deionized water and dried at room temperature to constant weight. The dried product was dispersed in deionized water to obtain 50 parts of dispersion with a concentration of 15 wt%. S103. Disperse the 8 parts of pretreated organobentonite obtained in step S101 into the 40 parts of dispersion in step S102, heat to 75℃ and stir at 400 rpm for 3 hours, then filter, and dry the filtered product at room temperature to constant weight to obtain modified organobentonite. The preparation method of the above-mentioned electromagnetic repair mud adhesive includes the following steps: S1. At 45℃, epoxy resin and reactive diluent are premixed according to mass parts, and then silane coupling agent is added and dispersed evenly. Modified organic bentonite, lubricant and modified absorbent are added in sequence and subjected to high-speed shearing at a shearing speed of 1500 rpm. Then, the mixture is stirred at a speed of 400 rpm, degassed under vacuum, and filtered through a 100-mesh filter to obtain component A. S2. At 30℃, the curing agent and curing accelerator are premixed according to the mass ratio, and then kaolin, flake graphite, lubricant and modified absorbent are added in sequence for high-speed dispersion at 600 rpm. After uniform dispersion, the mixture is degassed under vacuum and filtered through a 100-mesh filter to obtain component B. S3. Take components A and B in a mass ratio of 1:1, mix and stir until the color is uniform to obtain electromagnetic repair mud and iron glue.

[0019] Example 2 An electromagnetic repair mud adhesive, composed of component A and component B; Component A comprises the following components by weight: 30 parts epoxy resin, 5 parts reactive diluent, 30 parts modified absorbent, 5 parts lubricant, 6 parts modified organobentonite, and 1 part silane coupling agent. Component B comprises the following materials by weight: 20 parts curing agent, 1 part curing accelerator, 30 parts modified absorbent, 10 parts kaolin, 1 part flake graphite and 10 parts lubricant.

[0020] The preparation method of the above-mentioned modified organobentonite includes the following steps: S101. Calcine 10 parts of organic bentonite at 400℃ for 1 hour to obtain pretreated organic bentonite. S102. Ten parts of nano-fumed silica were added to an ethanol-water solution containing γ-glycidoxypropyltrimethoxysilane. The amounts of γ-glycidoxypropyltrimethoxysilane and the ethanol-water solution were 4 parts and 800 parts, respectively. The mass ratio of anhydrous ethanol to deionized water in the ethanol-water solution was 9:1. The mixture was treated continuously for 3 hours, then filtered. The filtered product was washed with deionized water and dried at room temperature to constant weight. The dried product was dispersed in deionized water to obtain 50 parts of dispersion with a concentration of 10 wt%. S103. Disperse the 8 parts of pretreated organobentonite obtained in step S101 into the 36 parts of dispersion in step S102, heat to 70℃ and stir at 300 rpm for 2 hours, then filter, and dry the filtered product at room temperature to constant weight to obtain modified organobentonite. The preparation method of the above-mentioned electromagnetic repair mud adhesive includes the following steps: S1. At 35℃, epoxy resin and reactive diluent are premixed according to mass parts, and then silane coupling agent is added and dispersed evenly. Modified organic bentonite, lubricant and modified absorbent are added in sequence and subjected to high-speed shearing at a shearing speed of 1400 rpm. Then, the mixture is stirred at a speed of 200 rpm, degassed under vacuum, and filtered through an 80-mesh filter to obtain component A. S2. At 20℃, the curing agent and curing accelerator are premixed according to the mass ratio, and then kaolin, flake graphite, lubricant and modified absorbent are added in sequence for high-speed dispersion at 500 rpm. After uniform dispersion, the mixture is degassed under vacuum and filtered through an 80-mesh filter to obtain component B. S3. Take components A and B in a mass ratio of 1:1, mix and stir until the color is uniform to obtain electromagnetic repair mud and iron glue.

[0021] Example 3 An electromagnetic repair mud adhesive, composed of component A and component B; Component A comprises the following components by weight: 50 parts epoxy resin, 15 parts reactive diluent, 60 parts modified absorbent, 15 parts lubricant, 10 parts modified organobentonite, and 3 parts silane coupling agent. Component B comprises the following materials by weight: 50 parts curing agent, 5 parts curing accelerator, 60 parts modified absorbent, 20 parts kaolin, 5 parts flake graphite and 20 parts lubricant. The preparation method of the above-mentioned modified organobentonite includes the following steps: S101. 12 parts of organic bentonite were calcined at 600℃ for 2 hours to obtain pretreated organic bentonite. S102. 15 parts of nano-fumed silica were added to an ethanol-water solution containing γ-glycidoxypropyltrimethoxysilane. The amounts of γ-glycidoxypropyltrimethoxysilane and the ethanol-water solution were 6 parts and 900 parts, respectively. The mass ratio of anhydrous ethanol to deionized water in the ethanol-water solution was 9:1. The mixture was treated continuously for 5 hours, then filtered. The filtered product was washed with deionized water and dried at room temperature to constant weight. The dried product was dispersed in deionized water to obtain 60 parts of dispersion with a concentration of 20 wt%. S103. Disperse 10 parts of pretreated organobentonite obtained in step S101 into 55 parts of dispersion in step S102, heat to 80℃ and stir at 500 rpm for 4 hours, then filter, and dry the filtered product at room temperature to constant weight to obtain modified organobentonite. The preparation method of the above-mentioned electromagnetic repair mud adhesive includes the following steps: S1. At 55℃, epoxy resin and reactive diluent are premixed according to mass parts, and then silane coupling agent is added and dispersed evenly. Modified organic bentonite, lubricant and modified absorbent are added in sequence and subjected to high-speed shearing at a shearing speed of 1600 rpm. Then, the mixture is stirred at a speed of 500 rpm, degassed under vacuum, and filtered through a 120-mesh filter to obtain component A. S2. At 40℃, the curing agent and curing accelerator are premixed according to the mass ratio, and then kaolin, flake graphite, lubricant and modified absorbent are added in sequence for high-speed dispersion at 800 rpm. After uniform dispersion, the mixture is degassed under vacuum and filtered through a 120-mesh filter to obtain component B. S3. Take components A and B in a mass ratio of 1:1, mix and stir until the color is uniform to obtain electromagnetic repair mud and iron glue.

[0022] In the above embodiments, the modified absorbent in components A and B is obtained by modifying the absorbent with a silane coupling agent, and the silane coupling agent accounts for 1-5 wt% of the absorbent mass; the absorbent is at least one of carbonyl iron powder, iron-silicon-aluminum powder, or iron-silicon-chromium powder; the silane coupling agent directly added in component A and the silane coupling agent used in the modified absorbent are at least one of aminopropyltriethoxysilane, aminopropyltrimethoxysilane, glycidyl ether propyltrimethoxysilane, and vinyltriethoxysilane; The absorbent used in Examples 1-3 above is carbonyl iron powder, the silane coupling agent used in the modified absorbent is aminopropyltriethoxysilane, and the silane coupling agent directly added to component A is glycidyl ether propyltrimethoxysilane. The specific preparation method of the modified absorbent is as follows: 200 parts of carbonyl iron powder are added to 1000 parts of anhydrous ethanol, followed by 4 parts of aminopropyltriethoxysilane, stirred for 240 min at a stirring speed of 600 rpm, and then dried to obtain the modified absorbent. The lubricant in components A and B is at least one of talc, mica powder, polyamide wax, polyethylene wax, and polyurea. In the above Examples 1-3, talc and polyamide wax are specifically used, and the mass ratio between talc and polyamide wax is 2:1. The active diluent in component A is one of alkyl glycidyl ether, benzyl glycidyl ether, and isooctyl glycidyl ether. Examples 1-3 specifically use alkyl glycidyl ether. The epoxy resin mentioned in component A is one of epoxy resin E-44, epoxy resin E-51, and epoxy resin E-54, specifically epoxy resin E-51. The curing agent used in component B is polyamide 650, and the curing accelerator is DMP-30.

[0023] Comparative Example 1 The difference between Comparative Example 1 and Example 1 is that the addition of kaolin in component B was omitted, while the rest of the steps are exactly the same as in Example 1.

[0024] Comparative Example 2 The difference between Comparative Example 2 and Example 1 is that the addition of modified organic bentonite in component A was omitted, while the rest of the steps were exactly the same as in Example 1.

[0025] Comparative Example 3 The difference between Comparative Example 3 and Example 1 is that the modified organobentonite in component A is replaced with organobentonite and nano-fumed silica. The total amount of organobentonite and nano-fumed silica is the same as that of the modified organobentonite, and the mass ratio between organobentonite and nano-fumed silica is 4:3.

[0026] Comparative Example 4 The difference between Comparative Example 4 and Example 1 is that the addition of modified organic bentonite in component A was omitted, and the addition of kaolin in component B was also omitted. The remaining steps are exactly the same as in Example 1.

[0027] Comparative Example 5 The difference between Comparative Example 5 and Comparative Example 3 is that the addition of nano-fumed silica is omitted, while the rest of the steps are exactly the same as those in Comparative Example 3.

[0028] The electromagnetic repair putty prepared in Example 1 and Comparative Examples 1-4 were subjected to performance tests. The appearance of the putty was visually confirmed; the cone penetration was tested according to GB / T 269-2023; the vertical plane shape retention rate was tested by taking 100g of the mixed putty, manually kneading it into a cylinder with a diameter of 3cm and a height of 3cm, placing it on an aluminum plate perpendicular to the horizontal plane, and leaving it for 2 hours, recording the percentage of the final height to the original height; the repeatability test was conducted by taking 50g of the mixed putty, first kneading it into a ball, then flattening it into a disc with a thickness of 0.3cm, and finally rolling it into a cylindrical strip with a diameter of about 1cm, repeating this process 10 times, and observing the changes in the state of the putty. The test results are shown in Table 1 below. Table 1: Performance test data of different electromagnetic repair putty adhesives As shown in Table 1, the electromagnetic repair mud-iron adhesive prepared in Examples 1-3 of this invention exhibits good plasticity. Examples 1 and 4 show that without the addition of modified organobentonite and kaolin, the material is a liquid adhesive with no plasticity. Examples 1 and 5 show that the lack of organobentonite, nano-fumed silica, or kaolin prevents the formation of a sufficiently strong network. During repeated shaping, the structure is damaged due to excessive shearing, and the material cannot achieve a solid, plastic state. Comparative Example 3 shows that when organobentonite and fumed silica are added simultaneously to component A, the difficult-to-disperse fumed silica leads to increased cone penetration, decreased height retention, and reduced plasticity in the final material. Unevenly dispersed silica agglomerates during repeated kneading, causing fragmentation during shaping. This demonstrates that the addition method described in this invention further improves plasticity. As shown in Example 1 and Comparative Examples 1-5, when organobentonite, kaolinite, and fumed silica are present simultaneously in a specific ratio, a synergistic effect is achieved: the layered structure of organobentonite provides the basic framework, kaolinite particles fill the voids and regulate rheological properties, and fumed silica nanoparticles further fill the voids and enhance the structural network, enabling the material to exhibit a solid-plastic state, changing shape when external force is applied and maintaining its shape essentially unchanged after the external force is removed; simultaneously, by incorporating fumed silica into the interlayer structure of organobentonite, and then using high-speed shearing to allow the fumed silica to detach from the interlayer of organobentonite and disperse into the material, the dispersion effect of fumed silica is improved, further enhancing the material's performance.

[0029] Comparative Example 6 The difference between Comparative Example 6 and Example 1 is that the modified absorbent was replaced with carbon-based iron powder that was not modified by aminopropyltriethoxysilane; the rest of the steps were exactly the same as in Example 1.

[0030] Comparative Example 7 The difference between Comparative Example 7 and Example 1 is that the addition of glycidyl ether propyltrimethoxysilane in component A was omitted, while the rest of the steps were exactly the same as in Example 1.

[0031] Comparative Example 8 The difference between Comparative Example 8 and Example 1 is that the addition of the curing accelerator in component B was omitted, while the rest of the steps are exactly the same as in Example 1.

[0032] Comparative Example 9 The difference between Comparative Example 9 and Example 1 is that the addition of flake graphite in component B was omitted, while the rest of the steps are exactly the same as in Example 1.

[0033] The electromagnetic repair putty adhesives prepared in Examples 1-3 and Comparative Examples 1-9 were subjected to performance tests. Specifically, flexibility was tested according to GB / T 1731-2020, impact strength according to GB / T 1732-2020, adhesion according to GB / T 5210-2006, and the material was molded to the required size and its vertical reflectivity was tested according to GJB 2038A-2011. The material thickness was 1.0 mm. The test results are shown in Table 2 below. Table 2: Performance test data of different electromagnetic repair putty adhesives As shown in Table 2, the electromagnetic repair mud and iron adhesive prepared in Examples 1-3 of this invention exhibit good flexibility, impact resistance, adhesion, and wave absorption properties. Through Examples 1 and Comparative Examples 1-5, it is evident that without the addition of organic bentonite, fumed silica, or kaolin, the material loses the support of its three-dimensional skeletal structure, resulting in a significant reduction in impact resistance and adhesion, and a certain impact on flexibility. Comparative Example 3, which hardened and crumbled during shaping; Comparative Example 4, which was liquid and could not be shaped; and Comparative Examples 1, 2, and 5, which were ointment-like, all failed to be shaped into the required form for wave absorption performance testing. Examples 1 and Comparative Examples 6-7 show that the addition of silane coupling agent can significantly improve the flexibility, impact resistance, adhesion, and microwave absorption performance of the mud-iron adhesive, indicating that the absorbent can be more uniformly dispersed in the mud-iron adhesive after modification with silane coupling agent, thereby enhancing the mechanical strength, flexibility, and microwave absorption performance of the material. Examples 1 and Comparative Example 8 show that the addition of curing accelerator can significantly improve the flexibility, impact resistance, and adhesion of the material, and can also significantly accelerate the curing rate of the mud-iron adhesive. Examples 1 and Comparative Example 9 show that the addition of a small amount of flake graphite has little effect on the mechanical properties of the material, but can significantly improve the impedance matching of the material and significantly improve the microwave absorption performance of the material.

[0034] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An electromagnetic repair putty for iron, characterized in that, It consists of component A and component B; Component A comprises the following materials by mass parts: 30-50 parts epoxy resin, 5-15 parts reactive diluent, 30-60 parts modified absorbent, 5-15 parts lubricant, 6-10 parts modified organobentonite, and 1-3 parts silane coupling agent; Component B comprises the following materials by mass: 20-50 parts curing agent, 1-5 parts curing accelerator, 30-60 parts modified absorbent, 10-20 parts kaolin, 1-5 parts flake graphite, and 10-20 parts lubricant; The modified absorbent in components A and B is obtained by modifying the absorbent with a silane coupling agent, and the silane coupling agent accounts for 1-5 wt% of the absorbent mass.

2. The electromagnetic repair putty adhesive according to claim 1, characterized in that, The absorbent is at least one of carbonyl iron powder, iron-silicon-aluminum powder, or iron-silicon-chromium powder; the silane coupling agent used in the silane coupling agent directly added to component A and the modified absorbent is at least one of aminopropyltriethoxysilane, aminopropyltrimethoxysilane, glycidyl ether propyltrimethoxysilane, or vinyltriethoxysilane.

3. The electromagnetic repair putty adhesive according to claim 1, characterized in that, The lubricant in components A and B is at least one of talc, mica powder, polyamide wax, polyethylene wax, and polyurea.

4. The electromagnetic repair putty adhesive according to claim 1, characterized in that, The active diluent in component A is one of alkyl glycidyl ether, benzyl glycidyl ether, and isooctyl glycidyl ether.

5. The electromagnetic repair putty adhesive according to claim 1, characterized in that, The preparation method of the modified organic bentonite includes the following steps: S101. Calcine the organic bentonite at a temperature of 400-600℃ for 1-2 hours to obtain pretreated organic bentonite; S102. Add nano-fumed silica to an ethanol-water solution containing γ-glycidoxypropyltrimethoxysilane and treat continuously for 3-5 hours. Then filter, wash the filtered product with deionized water and dry it at room temperature to constant weight. Disperse the dried product in deionized water to obtain a dispersion. S103. Disperse the pretreated organic bentonite obtained in step S101 into the dispersion in step S102, heat to 70-80℃ and stir at 300-500 rpm for 2-4 hours, then filter, and dry the filtered product at room temperature to constant weight to obtain modified organic bentonite.

6. The electromagnetic repair putty adhesive according to claim 1, characterized in that, In step S102, the mass ratio of nano-fumed silica, γ-glycidoxypropyltrimethoxysilane, and ethanol aqueous solution is 1:(0.4-0.6):(80-100); the mass ratio of anhydrous ethanol and deionized water in the ethanol aqueous solution is 9:1; and the concentration of nano-fumed silica in the dispersion treated with ethanol aqueous solution of γ-glycidoxypropyltrimethoxysilane is 10-20 wt%.

7. The electromagnetic repair putty adhesive according to claim 1, characterized in that, In step S103, the mass ratio between the pretreated organic bentonite and the dispersion is 1:(4.5-5.5).

8. A method for preparing electromagnetic repair putty adhesive as described in any one of claims 1-7, characterized in that, Includes the following steps: S1. At 35-55℃, epoxy resin and reactive diluent are premixed according to the mass ratio, and then silane coupling agent is added and dispersed evenly. Modified organic bentonite, lubricant and modified absorbent are added in sequence and subjected to high-speed shearing at a shearing speed of 1400-1600 rpm. Then, the mixture is stirred at a speed of 200-500 rpm, degassed under vacuum, and filtered through an 80-120 mesh filter to obtain component A. S2. After premixing the curing agent and curing accelerator by mass at 20-40℃, add kaolin, flake graphite, lubricant and modified absorbent in sequence and disperse at high speed at 500-800 rpm. After uniform dispersion, degas under vacuum and filter through an 80-120 mesh screen to obtain component B. S3. Take components A and B in a mass ratio of 1:1, mix and stir until the color is uniform to obtain electromagnetic repair mud and iron glue.

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