A composite hose based on micron-level self-repairing microcapsules and microwave triggering and a preparation and repair method thereof

Abstract

The application discloses a kind of based on micron self-repairing microcapsule and microwave trigger composite hose and its preparation and repair method, it is related to the technical field of self-repairing material and co-extrusion hose manufacturing, scheme includes:1) preparation epoxy resin-curing agent+nanometer calcium carbonate reinforcing filler-containing core material, urea-formaldehyde resin wall material micron self-repairing microcapsule;2) self-repairing layer is formed by spraying on the surface of reinforcing layer, reinforcing layer passes through extrusion die, and inner layer and outer layer are formed by extruding respectively on inner surface and outer surface by double screw extrusion equipment;3) carbonyl iron powder is added as microwave absorber in the outer layer of hose, and 30-60 seconds trigger repair is realized by cooperating handheld microwave generator.The application can complete repair within 5 minutes after crack appears, repair efficiency is greater than or equal to 85%, mechanical property change rate of hose is less than or equal to 5%, annual average maintenance cost is reduced by more than 50%, while reducing plastic waste generation, reducing medium leakage risk.

Description

Technical Field

[0001] This invention relates to the intersection of co-extruded hose manufacturing technology and self-healing functional material technology. Specifically, it relates to a composite hose integrating micron-level self-healing microcapsules and a microwave active triggering system, as well as the preparation method and repair method of the hose. Background Technology

[0002] Co-extruded hoses, with their synergistic advantages of multi-layered structure (corrosion-resistant inner layer, anti-aging outer layer, and reinforced middle layer), have become core components for media transportation in petrochemical, municipal, and agricultural fields. However, during long-term use, hoses are prone to cracking due to external impacts (such as collisions with construction machinery), media erosion (such as high-velocity particle abrasion), and environmental aging (such as ultraviolet radiation and low-temperature freeze-thaw cycles), leading to media leakage. This not only causes direct economic losses but may also trigger environmental pollution or safety accidents. Currently, the industry's repair technologies for co-extruded hose damage are mainly divided into three categories: First, manual repair technology, which requires shutdown and manual cleaning, application of adhesive, wrapping of reinforcing materials, and curing. The repair time usually exceeds 30 minutes, and the strength is greatly affected by the operator's skill. Second, passive self-healing technology, which uses a single-component microcapsule system that relies on moisture or oxygen in the environment to trigger curing. The repair cycle can be as long as 24 hours or more, and the efficiency decreases significantly in dry or low-temperature environments. Third, traditional co-extruded structures without self-healing function, which require complete replacement once cracks appear, resulting in high maintenance costs.

[0003] The aforementioned existing technologies have several drawbacks: In terms of repair efficiency, manual repair requires machine shutdown, and passive self-repair relies on natural conditions, neither of which can meet the demand for "non-stop, rapid repair" in emergency situations; in terms of repair strength, the strength after manual repair is usually only 60%-70% of the original pipe, and the strength of passive self-repair is even lower, making the repaired area a weak point for secondary damage; in terms of environmental adaptability, passive self-repair is significantly affected by temperature and humidity, and almost fails in environments below -10℃ or with relative humidity below 30%; in terms of maintenance costs, traditional hoses need to be replaced entirely after minor damage, with annual maintenance costs reaching 30% of the total equipment investment; in addition, the thermal stability of existing self-repairing microcapsules is insufficient, and they are prone to premature rupture at the co-extrusion temperature of 160-200℃, leading to leakage of the repair agent, which not only loses the self-repair function but also affects the basic mechanical properties of the hose and has poor compatibility with the co-extrusion process. Summary of the Invention

[0004] In view of the above-mentioned deficiencies of the prior art, the technical problem to be solved by the present invention is to develop a new type of self-healing composite hose and its supporting technology to meet the requirements of efficient repair, high repair strength, wide environmental adaptability, low maintenance cost and compatibility with co-extrusion process.

[0005] To achieve the above objectives, the present invention provides a composite flexible tube based on micron-level self-healing microcapsules and microwave triggering, characterized in that it comprises an inner layer, a reinforcing layer, a self-healing layer and an outer layer arranged from the inside to the outside;

[0006] The inner layer is a corrosion-resistant medium layer, used to contact the conveying medium and isolate it from erosion.

[0007] The reinforcing layer is a mechanical reinforcing layer, used to improve the overall tensile strength and pressure resistance of the hose;

[0008] The self-healing layer is composed of 30%-40% by mass of self-healing microcapsules and 60%-70% by mass of matrix binder;

[0009] The outer layer is a protective and microwave-responsive layer, and its material contains 0.5%-1% carbonyl iron powder by mass. The carbonyl iron powder is used to absorb microwave energy and convert it into heat.

[0010] The self-healing layer, the reinforcing layer, and the outer layer are all tightly bonded together with a matrix adhesive.

[0011] Preferably, the self-healing microcapsule comprises a wall material and a core material. The wall material is urea-formaldehyde resin with a thickness of 1-2 μm. The core material is a repair agent, which is a mixture of epoxy resin and curing agent at a mass ratio of 3:1. The repair agent contains 5% nano-calcium carbonate as a reinforcing filler.

[0012] Preferably, the self-healing microcapsules have an encapsulation rate of ≥90%, a storage stability of ≥12 months at 25°C, and a thermal decomposition temperature of ≥120°C.

[0013] Preferably, it also includes a microwave triggering auxiliary component, which is a handheld microwave generator.

[0014] Another aspect of the present invention provides a method for preparing the aforementioned composite flexible tube, comprising the following steps:

[0015] Step 1: Preparation of self-healing microcapsules

[0016] Step 1.1: Weigh epoxy resin and curing agent at a mass ratio of 3:1, mix them evenly, add 5% by mass of nano-calcium carbonate, and stir until the nano-calcium carbonate is completely dispersed to obtain the core material mixture;

[0017] Step 1.2: Dissolve urea-formaldehyde resin in deionized water to prepare a urea-formaldehyde resin solution with a mass concentration of 10%-15%;

[0018] Step 1.3: Slowly add the core material mixture obtained in Step 1.1 to the urea-formaldehyde resin solution in Step 1.2, and stir to carry out in-situ polymerization reaction to form a microcapsule suspension;

[0019] Step 1.4: Centrifuge the microcapsule suspension, collect the precipitate, wash it with deionized water, and then dry it in a vacuum drying oven to obtain self-healing microcapsules;

[0020] Step 2: Embedding a self-healing layer between co-extruded layers

[0021] Step 2.1: Prepare a twin-screw co-extrusion machine, with the two screws corresponding to the inner layer material and the outer layer material respectively;

[0022] Step 2.2: Set co-extrusion process parameters: co-extrusion temperature 160-200℃, self-healing layer spraying speed and traction speed matched at 5-10m / min;

[0023] Step 2.3: Start the co-extrusion equipment, spray the self-healing layer mixture evenly onto the outer surface of the reinforcing layer, and put it into the oven to dry; then pass the reinforcing layer through the extrusion die, and extrude the inner and outer layers on the inner surface of the reinforcing layer and the outer surface of the self-healing layer respectively through the co-extrusion equipment to form a composite hose preform;

[0024] Step 2.4: The composite hose blank is cooled by a cooling and shaping sleeve, then pulled by a traction machine and cut to a fixed length by a pipe cutting machine to obtain the finished composite hose.

[0025] Preferably, the method further includes the following steps:

[0026] Step 3: Integrate microwave triggering auxiliary components

[0027] The handheld microwave generator was paired with the composite flexible tube to complete the preparation.

[0028] A third aspect of the present invention provides a method for repairing the aforementioned composite hose, comprising the following steps:

[0029] Step A: Damage Detection

[0030] Determine the location, crack length, and width of damage to the composite hose through visual inspection or pressure leak detection;

[0031] Step B: Microwave Triggered Repair

[0032] Step B.1: Start the handheld microwave generator, set the microwave output power to 500-800W and the operating frequency to 2.45GHz, and point the directional radiation antenna at the damaged area, ensuring that the distance between the antenna and the damaged area is 5-10cm.

[0033] Step B.2: Turn on the infrared temperature measurement module to monitor the temperature of the damaged area in real time. When the temperature rises to 60-80℃, maintain this power for 30-60 seconds. If the temperature exceeds 80℃ during this period, the microwave generating module will automatically reduce the power. If the temperature is below 60℃, the power will be increased.

[0034] Step B.3: After irradiation, turn off the microwave generator and allow the repaired area to cool naturally to room temperature (around 25°C) for 1-2 minutes.

[0035] Preferably, the method further includes the following steps:

[0036] Step C: Repair Verification

[0037] If there is no leakage and the tensile strength of the repaired area reaches more than 85% of the original hose tensile strength, the repair is complete; if it does not meet the standard, repeat step B and adjust the irradiation time.

[0038] Compared with the prior art, the beneficial technical effects of the present invention are as follows:

[0039] (1) The product of this invention exhibits significant advantages in repair efficiency and environmental adaptability. When a crack with a length ≤5cm and a width ≤0.5mm appears in the hose, after 5 minutes of microwave-triggered repair at room temperature (25℃), the tensile strength of the repaired area can reach 88%-92% of the original strength, with a repair efficiency ≥88%, which is more than 25% higher than the existing technology. Even in a low temperature environment of -10℃, the repair efficiency can still be maintained at more than 85%, which completely solves the problem of failure of existing passive self-repair technology in low temperature or dry environment. At the same time, the total time from the appearance of the crack to the completion of the repair is ≤5 minutes, which is 80% shorter than traditional manual repair and 99% shorter than passive self-repair technology. It can realize online repair without stopping the machine, avoid economic losses caused by production or transportation interruption, and fully meet the needs of emergency working conditions.

[0040] (2) This invention effectively balances self-healing function and basic hose performance in terms of mechanical compatibility and service life. After embedding the self-healing microcapsules, the tensile strength and pressure resistance of the hose change by ≤5% compared with those without embedding, without affecting its original flexibility and performance. This ensures that the hose can still meet the mechanical performance requirements of daily transportation scenarios while possessing self-healing function. Accelerated aging test (1000 hours, 80℃) verifies that the microcapsule activity retention rate is ≥80%, the self-healing function of the hose can be maintained for more than 3 years, and the overall service life is comparable to that of traditional co-extruded hoses (≥5 years), achieving dual protection of function and service life, and avoiding the problem of shortened hose service life due to the addition of self-healing components.

[0041] (3) This invention can significantly reduce maintenance costs and reduce resource waste. Taking a chemical pipeline with an annual transport capacity of 1 million tons as an example, after adopting this invention, the average number of repairs per year is reduced from 12 to 3, and the cost per repair is reduced from 500 yuan / meter to 50 yuan / meter (including only microwave energy consumption and manual inspection costs), saving approximately 450,000 yuan in maintenance costs per year. At the same time, due to the reduction in downtime for repairs, the annual effective operating time of the equipment is extended from 300 days to 340 days, increasing production capacity by 13% and increasing annual output value by approximately 2 million yuan. By extending the service life of hoses through self-repair technology, approximately 500 tons / 10,000 tons of plastic waste can be reduced annually, reducing resource waste. Moreover, rapid repair can reduce the risk of corrosive media leakage in chemical pipelines by more than 90%, reducing environmental pollution and safety accidents.

[0042] The following will further explain the concept, specific structure, and technical effects of the present invention in conjunction with the accompanying drawings, so as to fully understand the purpose, features, and effects of the present invention. Attached Figure Description

[0043] Figure 1 This is a schematic diagram of a preferred embodiment of the present invention;

[0044] Figure 2 This is a flowchart illustrating the preparation process of a preferred embodiment of the present invention;

[0045] Figure 3 This is a self-healing flowchart of a preferred embodiment of the present invention.

[0046] In the diagram: 1. Inner layer; 2. Reinforcing layer; 3. Self-healing layer; 4. Outer layer. Detailed Implementation

[0047] The following description, with reference to the accompanying drawings, illustrates several preferred embodiments of the present invention to make its technical content clearer and easier to understand. The present invention can be embodied in many different forms, and the scope of protection of the present invention is not limited to the embodiments mentioned herein.

[0048] In the accompanying drawings, components with the same structure are indicated by the same numerical designation, and components with similar structures or functions are indicated by similar numerical designations. The dimensions and thicknesses of each component shown in the drawings are arbitrary, and the present invention does not limit the dimensions and thicknesses of each component. To make the illustrations clearer, the thickness of some components has been appropriately exaggerated in the drawings.

[0049] Example 1

[0050] like Figure 1 As shown, the composite hose in this embodiment adopts a four-layer coaxial structure, consisting of an inner layer 1, a reinforcing layer 2, a self-healing layer 3, and an outer layer 4 from the inside out. Each layer functions synergistically, balancing basic performance with self-healing capabilities.

[0051] Inner layer 1: Made of media-resistant modified PE-RT, with a thickness of 1-2mm. Its main function is to contact the conveying medium and isolate it from media erosion. Its chemical corrosion resistance meets the requirement that the mass change rate after immersion in 5% H2SO4 solution at 25℃ for 72 hours is ≤1%. The temperature range is -40℃ to 80℃, which is suitable for the media requirements of different scenarios.

[0052] Reinforcing layer 2: Made of polyester cord braided layer (pretreated with silane coupling agent), with a thickness of 0.5-1mm, used to improve the overall tensile strength and pressure resistance of the hose. Its tensile strength is ≥20MPa, elongation at break is ≤30%, and burst pressure under rated working pressure is ≥3 times the rated pressure. It can resist external impact and media erosion.

[0053] Self-healing layer 3: 50-100 μm thick, composed of 30%-40% by mass of self-healing microcapsules and 60%-70% by mass of modified EVA hot melt adhesive (matrix binder), with a microcapsule distribution density of 10⁻⁶ within the layer. 4 -10 5 Units / mm²; self-healing microcapsules with a diameter of 5-20μm, wall material of urea-formaldehyde resin (thickness 1-2μm, thermal decomposition temperature ≥120℃), core material of epoxy resin and curing agent mixed in a 3:1 mass ratio, and 5% nano calcium carbonate (particle size 50nm) added as a reinforcing filler to improve the mechanical properties after repair.

[0054] Outer layer 4: Made of high-density polyethylene (HDPE) with a thickness of 0.8-1.5mm, it contains 0.5%-1% carbonyl iron powder (particle size 1-5μm) as a microwave absorber, which can absorb microwave energy and convert it into heat, triggering the rapid curing of the repair agent; Outer layer 4 also has anti-ultraviolet aging function, and after 1000 hours of ultraviolet aging test, the tensile strength retention rate is ≥85%, protecting the internal structure from environmental erosion.

[0055] In addition, the composite hose is equipped with a microwave triggering auxiliary component (handheld microwave generator), which includes a microwave generation module (power 500-800W, frequency 2.45GHz), an infrared temperature measurement module (accuracy ±2℃), and a directional radiation antenna (radiation range diameter 5-10cm), which can achieve precise temperature control and energy concentration during the repair process, avoiding energy waste or hose material degradation.

[0056] Example 2

[0057] like Figure 2 As shown, this embodiment provides a method for preparing the composite flexible tube of Example 1, including the following steps:

[0058] Step 1, Preparation of self-healing microcapsules

[0059] Step 1.1: Weigh epoxy resin and curing agent at a mass ratio of 3:1, mix them evenly, add 5% by mass of nano-calcium carbonate with a particle size of 50nm, and stir until the nano-calcium carbonate is completely dispersed to obtain the core material mixture.

[0060] Step 1.2: Dissolve urea-formaldehyde resin in deionized water to prepare a urea-formaldehyde resin solution with a mass concentration of 10%-15%, and adjust the pH value to 3.5-4.0;

[0061] Step 1.3: Slowly add the core material mixture obtained in Step 1.1 to the urea-formaldehyde resin solution in Step 1.2, and carry out in-situ polymerization reaction at 70-80℃ and 300-500 r / min for 2-3 hours to form a microcapsule suspension.

[0062] Step 1.4: Centrifuge the microcapsule suspension at 8000-10000 r / min for 10-15 minutes, collect the precipitate, wash it with deionized water 3-5 times, and then dry it in a vacuum drying oven at 60-70℃ for 4-6 hours to obtain self-healing microcapsules.

[0063] The self-healing microcapsules have an encapsulation rate of ≥90%, storage stability at 25℃ for ≥12 months, and a thermal decomposition temperature of ≥120℃.

[0064] Step 2, embedding a self-healing layer 3 between co-extruded layers

[0065] Step 2.1: Prepare a twin-screw co-extrusion equipment, with the two screws corresponding to the inner layer material and the outer layer material, respectively; the self-healing layer mixture is a mixture of the self-healing microcapsules prepared in Step 1 and modified EVA hot melt adhesive at a mass ratio of 3:7-4:6, and the outer layer material is a mixture of high-density polyethylene and carbonyl iron powder with a particle size of 1-5μm at a mass ratio of 99.5:0.5-99:1.

[0066] Step 2.2: Set co-extrusion process parameters: co-extrusion temperature 160-200℃, self-healing layer 3 spraying speed and traction speed matched to 5-10m / min;

[0067] Step 2.3: Start the co-extrusion equipment, spray the self-healing layer mixture evenly onto the outer surface of the reinforcing layer 2, and put it into the oven to dry; then pass the reinforcing layer 2 through the extrusion die, and extrude the inner layer 1 and outer layer 4 on the inner surface of the reinforcing layer 2 and the outer surface of the self-healing layer 3 respectively through the co-extrusion equipment to form a composite hose blank;

[0068] Step 2.4: The composite hose blank is cooled by a cooling and shaping sleeve, then pulled by a traction machine and cut to a fixed length by a pipe cutting machine to obtain the finished composite hose.

[0069] Step 3, integrate microwave triggering auxiliary components

[0070] A handheld microwave generator, comprising a microwave generating module, an infrared temperature measuring module, and a directional radiation antenna, is paired with a composite flexible tube semi-finished product. The microwave generating module has an output power of 500-800W and an operating frequency of 2.45GHz. The infrared temperature measuring module has a temperature measurement accuracy of ±2℃. The directional radiation antenna has a radiation range of a circular area with a diameter of 5-10cm, thus completing the preparation of the composite flexible tube.

[0071] Example 3

[0072] like Figure 3 As shown, this embodiment provides a repair method for the composite hose of Embodiment 1, including the following steps:

[0073] Step A, Damage Detection

[0074] The location, length, and width of damage to the composite hose are determined by visual inspection or pressure leak detection. The pressure for pressure leak detection is 1.2 times the rated working pressure of the hose, and the detected crack length is ≤5cm and the width is ≤0.5mm.

[0075] Step B, microwave-triggered repair

[0076] Step B.1: Start the handheld microwave generator, which includes a microwave generating module with an output power of 500-800W and a working frequency of 2.45GHz, an infrared temperature measuring module with a temperature measurement accuracy of ±2℃, and a directional radiation antenna with a radiation range of a circular area with a diameter of 5-10cm. After setting the microwave output power, align the directional radiation antenna with the damaged area, ensuring that the distance between the antenna and the damaged area is 5-10cm.

[0077] Step B.2: Activate the infrared temperature measurement module to monitor the temperature of the damaged area in real time. When the temperature rises to 60-80℃, maintain this power for 30-60 seconds. If the temperature exceeds 80℃, the microwave generating module will automatically reduce the power by 10%-20%. If the temperature is below 60℃, the power will be increased by 10%-20%. If the damaged area is located at the bend of the flexible tube, install a polytetrafluoroethylene arc-shaped waveguide plate between the directional radiation antenna and the flexible tube to ensure that the microwave energy evenly covers the damaged area of ​​the bend surface.

[0078] Step B.3: After irradiation, turn off the microwave generator and allow the repaired area to cool naturally to room temperature.

[0079] Step C, Repair Verification

[0080] If no leak is found during the pressure leak test in step A, a universal testing machine is used to perform a tensile strength test on the repaired area at a test speed of 50 mm / min. The sampling method is to cut a sample with a length of 100 mm and a width of 25 mm from the repaired area, and perform three parallel tests and take the average value. If the tensile strength reaches more than 85% of the tensile strength of the original hose, the repair is complete. If it does not meet the standard, repeat step B and extend the irradiation time by 10-20 seconds.

[0081] The preferred embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of the present invention without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A method for preparing a composite flexible tube based on micron-sized self-healing microcapsules and microwave triggering, characterized in that... The composite hose comprises, from the inside out, an inner layer, a reinforcing layer, a self-healing layer, and an outer layer; The inner layer is a corrosion-resistant medium layer, used to contact the conveying medium and isolate it from erosion. The reinforcing layer is a mechanical reinforcing layer, used to improve the overall tensile strength and pressure resistance of the hose; The self-healing layer is composed of 30%-40% by mass of self-healing microcapsules and 60%-70% by mass of matrix binder; The outer layer is a protective and microwave-responsive layer, and its material contains 0.5%-1% carbonyl iron powder by mass. The carbonyl iron powder is used to absorb microwave energy and convert it into heat. The self-healing layer, the reinforcing layer, and the outer layer are all tightly bonded together with a matrix adhesive. The self-healing microcapsule comprises a wall material and a core material. The wall material is urea-formaldehyde resin with a thickness of 1-2 μm. The core material is a repair agent, which is a mixture of epoxy resin and curing agent at a mass ratio of 3:

1. The repair agent contains 5% by mass of nano-calcium carbonate as a reinforcing filler. The method includes the following steps: Step 1: Preparation of self-healing microcapsules; Step 1.1: Weigh epoxy resin and curing agent at a mass ratio of 3:1, mix them evenly, add 5% by mass of nano-calcium carbonate, and stir until the nano-calcium carbonate is completely dispersed to obtain the core material mixture; Step 1.2: Dissolve urea-formaldehyde resin in deionized water to prepare a urea-formaldehyde resin solution with a mass concentration of 10%-15%; Step 1.3: Slowly add the core material mixture obtained in Step 1.1 to the urea-formaldehyde resin solution in Step 1.2, and stir to carry out in-situ polymerization reaction to form a microcapsule suspension; Step 1.4: Centrifuge the microcapsule suspension, collect the precipitate, wash it with deionized water, and then dry it in a vacuum drying oven to obtain self-healing microcapsules; Step 2: Embedding a self-healing layer between co-extruded layers Step 2.1: Prepare a twin-screw co-extrusion machine, with the two screws corresponding to the inner layer material and the outer layer material respectively; Step 2.2: Set co-extrusion process parameters: co-extrusion temperature 160-200℃, self-healing layer spraying speed and traction speed matched at 5-10m / min; Step 2.3: Start the co-extrusion equipment, spray the self-healing layer mixture evenly onto the outer surface of the reinforcing layer, and put it into the oven to dry; then pass the reinforcing layer through the extrusion die, and extrude the inner and outer layers on the inner surface of the reinforcing layer and the outer surface of the self-healing layer respectively through the co-extrusion equipment to form a composite hose preform; Step 2.4: The composite hose blank is cooled by a cooling and shaping sleeve, then pulled by a traction machine and cut to a fixed length by a pipe cutting machine to obtain the finished composite hose.

2. The method for preparing the composite flexible tube as described in claim 1, characterized in that, The composite hose also includes a microwave triggering auxiliary component, which is a handheld microwave generator.

3. The method for preparing the composite flexible tube as described in claim 2, characterized in that, It also includes the following steps: Step 3: Integrate microwave triggering auxiliary components The handheld microwave generator was paired with the composite flexible tube to complete the preparation.

4. The method for preparing the composite flexible tube as described in claim 1, characterized in that, The self-healing microcapsules have an encapsulation rate of ≥90%, a storage stability of ≥12 months at 25℃, and a thermal decomposition temperature of ≥120℃.

5. A repair method based on a composite flexible tube using micron-sized self-healing microcapsules and microwave triggering, characterized in that, The composite hose comprises, from the inside out, an inner layer, a reinforcing layer, a self-healing layer, and an outer layer; The inner layer is a corrosion-resistant medium layer, used to contact the conveying medium and isolate it from erosion. The reinforcing layer is a mechanical reinforcing layer, used to improve the overall tensile strength and pressure resistance of the hose; The self-healing layer is composed of 30%-40% by mass of self-healing microcapsules and 60%-70% by mass of matrix binder; The outer layer is a protective and microwave-responsive layer, and its material contains 0.5%-1% carbonyl iron powder by mass. The carbonyl iron powder is used to absorb microwave energy and convert it into heat. The self-healing layer, the reinforcing layer, and the outer layer are all tightly bonded together with a matrix adhesive. The self-healing microcapsule comprises a wall material and a core material. The wall material is urea-formaldehyde resin with a thickness of 1-2 μm. The core material is a repair agent, which is a mixture of epoxy resin and curing agent at a mass ratio of 3:

1. The repair agent contains 5% by mass of nano-calcium carbonate as a reinforcing filler. It also includes a microwave triggering auxiliary component, which is a handheld microwave generator; The method includes the following steps: Step A: Damage Detection Determine the location, crack length, and width of damage to the composite hose through visual inspection or pressure leak detection; Step B: Microwave Triggered Repair Step B.1: Start the handheld microwave generator, set the microwave output power to 500-800W and the operating frequency to 2.45GHz, and point the directional radiation antenna at the damaged area, ensuring that the distance between the antenna and the damaged area is 5-10cm. Step B.2: Turn on the infrared temperature measurement module to monitor the temperature of the damaged area in real time. When the temperature rises to 60-80℃, maintain this power for 30-60 seconds. If the temperature exceeds 80℃ during this period, the microwave generating module will automatically reduce the power. If the temperature is below 60℃, the power will be increased. Step B.3: After irradiation, turn off the microwave generator and allow the repaired area to cool naturally to room temperature for 1-2 minutes.

6. The repair method for the composite hose as described in claim 5, characterized in that, It also includes the following steps: Step C: Repair and Verification; If there is no leakage and the tensile strength of the repaired area reaches more than 85% of the original hose tensile strength, the repair is complete; if it does not meet the standard, repeat step B and adjust the irradiation time.

7. The repair method for the composite hose as described in claim 5, characterized in that, The self-healing microcapsules have an encapsulation rate of ≥90%, a storage stability of ≥12 months at 25℃, and a thermal decomposition temperature of ≥120℃.

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