A carbon nanometer polymer material for repairing a gear box body in a wind power industry and a preparation method and a rapid repairing method thereof

Abstract

This invention discloses a carbon nanoparticle polymer material for repairing wind power gearbox housings, its preparation method, and a rapid repair method, belonging to the technical field of wind power equipment repair and polymer composite materials. Addressing the problem of severe exothermic curing and large volume shrinkage leading to crack propagation during thick-coating repair of cast iron wind turbine gearbox housings using existing epoxy repair materials, this invention provides a cationic ring-opening polymerization system based on alicyclic epoxy resin, using diaryliodonium salt as a thermo-cationic initiator, spirocyclic orthocarbonate as an expanding monomer, and introducing 4,4'-diaminobenzoylaniline to construct a dynamic hydrogen bond network. This invention also provides an A / B two-component preparation method for this material and a rapid on-site repair process. The material of this invention exhibits a low peak internal temperature after a single coating, low volume shrinkage, high compressive strength, and high shear strength, effectively solving the problem of thermal stress-induced cracking during thick-coating repair of cast iron wind turbine gearbox housings.

Description

Technical Field

[0001] This invention belongs to the field of wind power equipment repair and polymer composite materials technology, specifically relating to a carbon nanotube polymer material for repairing gearbox housings in the wind power industry, its preparation method, and a rapid repair method. Background Technology

[0002] The gearbox of a wind turbine generator set is the core component of the wind turbine's drivetrain. It operates under heavy loads, variable speeds, impacts, and alternating stress conditions for extended periods, and is often installed in harsh environments with extremely poor maintenance accessibility, such as remote mountainous areas, Gobi deserts, and near-shore locations. The gearbox housing is typically cast from gray cast iron or ductile iron. During service, due to fatigue, wear, corrosion, or accidental impacts, the housing is highly susceptible to failure modes such as cracks, bearing housing wear (runaway bearings), and air penetration.

[0003] Traditional repair methods mainly include arc welding and factory replacement. Arc welding requires disassembling and transporting the gearbox to the ground. The welding process generates a high-temperature heat-affected zone, which can easily lead to the formation of brittle martensitic phases or secondary cracks in the cast iron housing. Furthermore, the welding equipment is difficult to transport and poses significant safety hazards in high-altitude operations. Factory replacement is extremely costly, with a single gearbox replacement costing 500,000 to 1.5 million yuan and a downtime of 3 to 6 months. In recent years, carbon nanotube polymer repair materials, mainly based on epoxy resin, have gradually become the mainstream solution for wind power on-site repair due to their advantages such as room temperature curing, no disassembly required, and simple construction. However, existing epoxy repair materials have significant technical defects in the thick coating repair (single coating thickness > 5 mm) of wind turbine gearbox housings: the curing reaction is highly exothermic, with internal peak temperatures reaching over 150°C, and the resulting thermal stress can induce the propagation of existing microcracks in the cast iron housing; the curing volume shrinkage rate is as high as 3-5%, generating significant internal stress and causing the repair layer to peel off from the substrate interface. The aforementioned problems severely restrict the widespread application of carbon nanopolymer materials in the repair of wind turbine gearbox structural components.

[0004] Existing technologies have reported studies on using spirocyclic carbonates to modify epoxy resins to reduce curing shrinkage (e.g., Wang Changsong et al., 1998). However, these studies are limited to thin-layer bonding or general modification, and do not address thick-coat repair scenarios with a single coating thickness ≥ 5 mm. In thick-coat repair of wind turbine gearbox housings, in addition to shrinkage stress, the thermal stress generated by curing exothermics can also lead to crack propagation in the cast iron matrix. Existing technologies do not disclose technical solutions that simultaneously address the issues of "low shrinkage" and "low exothermics." Furthermore, it is known in the art that amine compounds (especially aromatic amines) can undergo polymerization inhibition reactions with the active centers (oxonium ions) of cationic polymerization systems; therefore, the addition of amines is generally avoided in cationic systems. This invention is based on overcoming the aforementioned technical biases. Summary of the Invention

[0005] This invention addresses the technical problem of severe heat release and large volume shrinkage leading to crack propagation during the thick coating repair of wind turbine gearbox housings using existing epoxy repair materials. It provides a low-heat, low-shrinkage carbon nanopolymer material, its preparation method, and a rapid repair method.

[0006] To achieve the above objectives, this application adopts the following technical solution: In a first aspect, the present invention provides a carbon nanoparticle polymer material for repairing gearbox housings in the wind power industry, which is composed of independently packaged component A and component B, with a mass ratio of component A to component B of 100:30~50.

[0007] (ii) Component A By mass, component A comprises the following raw materials: 100 parts of alicyclic epoxy resin; 3-5 parts of spirocyclic carbonate expanding monomers; 2-2.5 parts of 4,4'-diaminobenzoylaniline; 5-10 parts of reactive diluent; 30-50 parts of silica micropowder filler; 1-2 parts of fumed silica; The mass ratio of the spirocyclic carbonate expanding monomer to 4,4'-diaminobenzoylaniline is (1.5~2):1.

[0008] Preferably, the alicyclic epoxy resin is 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexylcarboxylate (ERL-4221).

[0009] Using this method, the epoxy groups of the resin are directly attached to the alicyclic ring, without benzene rings and ether bonds, and have high ring strain energy (about 115 kJ / mol), large ring-opening driving force, moderate cationic polymerization activity, and the polyether structure formed after curing has excellent heat resistance and dimensional stability.

[0010] Preferably, the spirocyclic protocarbonate compound is S100.

[0011] Using this scheme, when the monomer undergoes double ring-opening polymerization under cationic initiation, the molecular conformation changes from a tight spirocyclic shape to an extended linear shape, resulting in volume expansion with an expansion rate of +2% to +5%, which can offset the shrinkage of the epoxy group.

[0012] Furthermore, the amide bonds in the 4,4'-diaminobenzoylaniline (TBAN) molecule form a reversible hydrogen bond network with the polyether chain during the curing process.

[0013] Preferably, the active diluent is benzyl alcohol (benzyl alcohol).

[0014] Using this method, the hydroxyl groups in the benzyl alcohol molecule can react with the epoxy groups, and at the same time, it acts as a polar solvent to promote the dissolution of TBAN in alicyclic epoxides.

[0015] Preferably, the silicon micropowder filler is 800-mesh acid-washed silicon micropowder with a surface hydroxyl density of 2-5 hydroxyl groups / nm² and a moisture content of ≤0.1%.

[0016] Using this method, the surface of acid-washed silicon micropowder is free of alkaline oxide impurities, thus avoiding the inhibition of cationic polymerization.

[0017] Preferably, the fumed silica is hydrophobic fumed silica.

[0018] Using this method, hydrophobic fumed silica can adjust the thixotropic properties of the material and prevent sagging during vertical surface construction.

[0019] (ii) Component B By mass, component B comprises the following raw materials: 50 parts of alicyclic epoxy resin; 2-4 parts of thermal cationic initiator; Accelerator 0.5~1.5 parts; 20-30 parts of silica micropowder filler; Preferably, the thermal cationic initiator is diaryliodonium hexafluorophosphate or diaryliodonium hexafluoroantimonate (such as PI-6974) (soluble in 50% propylene carbonate solution).

[0020] This method facilitates dispersion using a 50% propylene carbonate solution. The initiator undergoes thermal decomposition at 50-60°C, producing a superacid (HPF6 or HSbF6). The protonated epoxy groups of this superacid form oxonium ion active centers, initiating ring-opening polymerization. Using this initiator, the chain growth reaction can continue even under conditions of no light or heat, ensuring complete curing of deep layers of material under thick coating conditions.

[0021] Preferably, the promoter is 1-methylimidazole.

[0022] Using this method, the tertiary amine structure of 1-methylimidazole can form a complex with the epoxy group, reducing the electron cloud density of the epoxy group and making it more susceptible to cation attack, thereby catalyzing the curing reaction. Adding 1-1.5 parts by weight of 1-methylimidazole can shorten the gel time at 25°C from 180 minutes to 45 minutes, while the peak exothermic temperature only increases by 5-8°C.

[0023] Secondly, the present invention provides a method for preparing the aforementioned carbon nanoparticle polymer material for repairing gearbox housings in the wind power industry, as follows: (I) Preparation of Component A Step A1: Raw material pretreatment The silica micropowder filler was dried in an oven at 120℃ for 2 hours and then cooled to room temperature for later use. The drying process removes adsorbed moisture from the surface of the filler, and the moisture content is controlled to be ≤0.1%.

[0024] Step A2: Dissolve TBAN Add 100 parts of alicyclic epoxy resin and 5-10 parts of benzyl alcohol sequentially to a reactor equipped with a stirrer and a temperature control jacket. Start stirring at 300 rpm and heat to 65±2℃. Slowly add 2-2.5 parts of TBAN while stirring, controlling the addition rate to within 5 g / min to prevent clumping. Maintain stirring at 65±2℃ for 30 minutes until the TBAN is completely dissolved and the solution is clear and transparent. In this step, the amino group of TBAN undergoes a preliminary reaction with the epoxy group of the alicyclic epoxy resin to form an intermediate containing an amide bond.

[0025] Step A3: Add spirocyclic expanded monomer Cool the reactor to 45±2℃, add 3-5 parts of spirocyclic expanded monomer, and continue stirring for 15 minutes until homogeneous. The ambient humidity for this step should be controlled at ≤50%RH.

[0026] Step A4: Add filler and thixotropic agent Maintain the reactor temperature below 40℃. Add 30-50 parts of dried silica powder in batches, with each batch not exceeding 1 / 3 of the total filler volume. Add the next batch only after the previous batch has dispersed evenly. Add 1-2 parts of fumed silica. Increase the stirring speed to 1500 rpm and disperse at high speed for 30 minutes.

[0027] Step A5: Vacuum degassing Stop stirring, turn off heating, and turn on the vacuum pump to reduce the pressure inside the reactor to ≤-0.095MPa (absolute pressure ≤5kPa). Maintain vacuum degassing for 30 minutes, stirring every 10 minutes (100rpm, 30 seconds each time) to promote bubble rise. Degassing endpoint criteria: no obvious bubbles emerge from the liquid surface, and the material surface has a mirror-like gloss.

[0028] Step A6: Packaging Release the vacuum and purge with dry nitrogen. Fill component A into aluminum foil composite bags or the A tube of a two-component tubing, seal the packaging, and mark with the production batch number and date. Store in a cool, dry place (≤30℃), sealed. Shelf life is 6 months.

[0029] (II) Preparation of Component B Step B1: Prepare the initiator pre-solution Add 50 parts of alicyclic epoxy resin, 2-4 parts of thermal cationic initiator, and 0.5-1.5 parts of 1-methylimidazole to the mixing tank. Stir at room temperature (20-30℃) for 15 minutes at 300 rpm until completely homogeneous. This step must be performed in the dark, as diaryliodonium salts are sensitive to ultraviolet light.

[0030] Step B2: Add filler Add 20-30 parts of silicon micro powder in batches under stirring conditions, increase the rotation speed to 1500 rpm, disperse at high speed for 20 minutes, and control the material temperature at ≤35℃.

[0031] Step B3: Vacuum degassing and packaging The same vacuum degassing process as component A is used. Component B is packaged in opaque aluminum foil bags or dark-colored tubing and stored in a cool, dark place (≤25℃), sealed. Shelf life is 3 months.

[0032] Thirdly, the present invention provides a rapid repair method for carbon nanopolymer materials used in the repair of gearbox housings in the wind power industry.

[0033] A rapid repair method using carbon nanotube polymer materials for gearbox housings in the wind power industry includes the following steps: (a) Surface treatment Step S1: Mechanical grinding Use an angle grinder with a 60-80 grit grinding wheel or a flap wheel to grind the defective area, extending the grinding range outward by ≥50mm and grinding to a depth of 0.5-1.0mm to remove the surface oxide layer, oil layer, and fatigue layer. The target surface roughness Ra is 5-10μm, and it should have a uniform metallic luster with no mirror-like areas.

[0034] Step S2: Cleaning and degreasing The first wipe is made by wiping the polished surface with an acetone-soaked non-woven cloth to remove dust and surface oil; the second wipe is made by wiping with anhydrous ethanol to remove acetone residue. The test method is to wipe the surface with a white cloth; no stains indicate that it is qualified.

[0035] Step S3: Hot air drying Using an industrial hot air gun, set the temperature to 150℃, maintain a distance of 100~150mm from the surface, and move the gun at a speed of 50mm / s, blowing 2~3 times. The surface temperature should be controlled at 60~80℃. This step evaporates residual solvents (acetone bp=56℃, ethanol bp=78℃).

[0036] (II) Primer application Step S4: Material Mixing Take component A and component B, and mix them at a mass ratio of 100:30~50. The mixing ratio can be adjusted according to the ambient temperature: use 30~35 parts of component B in winter (<10℃) and 45~50 parts of component B in summer (>30℃). Mix by hand stirring for 2~3 minutes or by low-speed electric stirring for 1 minute, avoiding the mixing direction from entrapping air bubbles. The standard for judging the uniformity of the mixture is: uniform color and no streaks.

[0037] Step S5: Apply primer coating Apply a 0.5-1.0 mm thick primer to the defective surface using a scraper or brush. After application, let it stand for 5-10 minutes to allow the material to fully wet the substrate surface.

[0038] (III) Main body filling Step S6: Layered Fill Each filler layer should be ≤8mm thick. After filling, use a scraper to repeatedly scrape and press in one direction 3-5 times to remove air bubbles. Allow 20-30 minutes between layers, until the surface is touch-dry and not sticky. Repeat filling until the defect is completely filled, leaving a 1-2mm machining allowance for the last layer.

[0039] (iv) Curing Step S7: Curing at room temperature Environmental conditions: Temperature 15~35℃, humidity ≤80%RH. Curing time: Surface dry time 1~2 hours (surface can be slightly touched), machineable time 6~8 hours (Shore hardness ≥70D), complete curing time 24 hours (reaching more than 90% of final mechanical properties), final performance achieved time 72 hours.

[0040] (v) Post-processing Step S9: Machining Boring, milling, or turning is performed using carbide cutting tools. Cutting parameters: linear speed 30~50 m / min, feed rate 0.05~0.10 mm / r, depth of cut 0.1~0.3 mm. Water-based emulsion coolant is used to assist in heat dissipation.

[0041] Step S10: Inspection Dimensional inspection is performed using an inside micrometer or coordinate measuring machine, restoring the dimensions to ±0.05mm of the design size. Surface hardness inspection: Shore hardness ≥85D. Adhesion quality inspection: tapping test, the sound should be crisp and without hollow sounds.

[0042] Optionally, in step (iv), when the ambient temperature is below 10℃ or production needs to be resumed quickly, an infrared heating lamp is used to assist curing. The infrared lamp (wavelength 2~10μm) is fixed at a distance of 300~500mm from the repair surface, and the temperature of the repair surface is controlled at 50~60℃ for 2~3 hours. Infrared thermal radiation can penetrate the material surface and uniformly heat the deep layers, accelerating the decomposition of cationic initiators and chain growth reactions.

[0043] Furthermore, the volume shrinkage rate of the cured material is ≤1.2%, and the internal peak temperature is ≤80℃ when a single coating thickness of 10mm is applied.

[0044] Compared with the prior art, this application has the following beneficial effects: 1. This invention uses cationic ring-opening polymerization instead of traditional amine stepwise polymerization, resulting in a uniform enthalpy change distributed throughout each chain growth step, thus avoiding explosive exothermic reactions. When coated with a single 10mm thickness, the internal peak temperature is ≤80℃, which is more than 70% lower than that of traditional materials (≥150℃), effectively preventing the propagation of cracks in the cast iron casing.

[0045] 2. This invention introduces spirocyclic carbonate-based expanding monomers, which offset the curing shrinkage of the epoxy group through volume expansion during ring-opening polymerization. The material's volume shrinkage rate is ≤1.2%, which is more than 60% lower than that of traditional materials (3~5%), significantly reducing curing internal stress.

[0046] 3. This invention introduces TBAN to construct a dynamic hydrogen bond network. The reversible breakage-reforming mechanism of hydrogen bonds can absorb the strain energy generated by solidification shrinkage and avoid stress concentration transmission to the cast iron matrix interface.

[0047] 4. The compressive strength and shear strength of the present invention are significantly improved compared with those of traditional materials.

[0048] 5. This invention can be machined at room temperature for 6-8 hours and reaches over 90% of its final strength in 24 hours, shortening the curing time by more than 50% compared to traditional materials (machined in 24 hours and fully cured in 72 hours).

[0049] 6. This invention also discovered through extensive experiments that a synergistic effect can be achieved when the mass ratio of spirocyclic orthocarbonate expanding monomers to 4,4'-diaminobenzoylaniline (TBAN) is within the range of (1.5~2):1, reducing the shrinkage rate to below 1.2%, and no microcracks are generated after 100 thermal cycles at 80°C. Beyond this ratio range, the synergistic effect is significantly weakened. Attached Figure Description

[0050] Figure 1 This is a comparison chart of the curing exothermic curves of Example 1 and Comparative Example 1 of the present invention.

[0051] Figure 2 This is a process flow diagram of the rapid repair method of the present invention. Detailed Implementation

[0052] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that the following embodiments are only for explaining the invention and not for limiting it. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0053] The present invention will be further described below with reference to specific embodiments, but the scope of protection of the present invention is not limited thereto.

[0054] Example 1 This embodiment provides a carbon nanotube polymer material for repairing gearbox housings in the wind power industry, its preparation method, and a rapid repair method.

[0055] I. Material Preparation Component A: Add 100 kg of ERL-4221 resin and 8 kg of benzyl alcohol to the reactor, heat to 65°C, add 2.2 kg of TBAN, and stir to dissolve for 30 minutes. Cool to 45°C, add 4 kg of S-100 spirocyclic monomer, and stir for 15 minutes. Cool to below 40°C, add 40 kg of 800-mesh acid-washed silica powder and 1.5 kg of fumed silica in batches, and disperse at 1500 rpm for 30 minutes. Vacuum degas for 30 minutes, then package.

[0056] Component B: Add 50 kg of ERL-4221 resin, 3 kg of PI-6974 initiator, and 1 kg of 1-methylimidazole to the mixing tank, and stir at room temperature for 15 minutes. Add 25 kg of silica powder in batches and disperse at 1500 rpm for 20 minutes. Vacuum degas for 30 minutes and package in the dark.

[0057] II. Repair and construction (such as...) Figure 2 ) Repairing the wear (0.8mm) in the bearing housing of a 2.5MW wind turbine gearbox: Grind the bearing housing to Ra 6μm, clean with acetone / ethanol, and dry with hot air to 70℃. Mix components A and B (mass ratio 100:40), apply a 0.8mm primer, and let stand for 8 minutes. Fill in 3 layers, each 6-7mm thick, with a 25-minute interval between layers. After curing at room temperature (25℃) for 7 hours, bore to the designed dimensions.

[0058] III. Performance Testing Peak curing temperature (thermocouple embedded in the center of a 10mm thickness): 78℃ (test results as shown) Figure 1Volume shrinkage rate (density method): 1.1%; compressive strength (GB / T1041): 118MPa; shear strength (GB / T7124, cast iron-cast iron): 29.5MPa; strength retention rate after immersion in gear oil (80℃×7d): 88%; no cracks in the repair layer after 100 cycles of thermal cycling at 80℃.

[0059] Example 2 The difference between this embodiment and Embodiment 1 is that the ambient temperature is 5℃, and infrared-assisted curing is used. The infrared lamp is 400mm away from the repair surface, the surface temperature is controlled at 55℃, and heating lasts for 2.5 hours. The properties after curing are: compressive strength 112MPa, shear strength 27.8MPa, which are comparable to those cured at room temperature for 24 hours.

[0060] Comparative Example 1 A commercially available brand of metal repair compound (bisphenol A epoxy + amine curing agent) was used, and the application was carried out according to the instructions. Test results: peak curing temperature 168℃ (test results are as follows). Figure 1 The volume shrinkage rate is 4.3%, the compressive strength is 72 MPa, the shear strength is 15.6 MPa, and the strength retention rate after immersion in gear oil (80℃×7d) is 65%.

[0061] Comparative Example 2 The difference from Example 1 is that S-100 spirocyclic monomer is not added to component A. The remaining components and preparation method are the same as in Example 1. Test results: volume shrinkage rate 4.2%, peak curing temperature 85℃, compressive strength 89MPa, shear strength 18.2MPa. After 100 cycles of gear oil thermal cycling at 80℃, severe through-cracks appeared in the repair layer.

[0062] Comparative Example 3 The difference from Example 1 is that TBAN is not added to component A. The remaining components and preparation method are the same as in Example 1. Test results: volume shrinkage rate 3.8%, compressive strength 112 MPa, but microcracks appeared after 100 cycles at 80°C.

[0063] Comparative Example 4 The difference from Example 1 is that 4 kg of S-100 and 0.6 kg of TBAN were added to component A. The remaining components and preparation methods are the same as in Example 1. Test results: volume shrinkage rate 2.5%, peak curing temperature 88℃, compressive strength 105MPa, shear strength 24.5MPa, and after 100 cycles of gear oil heat cycling at 80℃, a small number of microcracks appeared in the repair layer.

[0064] Comparative Example 5 The difference from Example 1 is that 1 kg of S-100 and 2.2 kg of TBAN were added to component A. The remaining components and preparation methods are the same as in Example 1. Test results: volume shrinkage rate 3.5%, compressive strength 94 MPa, shear strength 20.3 MPa, and moderate cracks appeared in the repair layer after 100 cycles of gear oil heat cycling at 80°C.

[0065] Comparative Example 6 The difference from Example 1 is that the alicyclic epoxy resin (ERL-4221) in components A and B is replaced with ordinary bisphenol A epoxy resin (E-51). The remaining components and preparation method are the same as in Example 1. Test results: peak curing temperature 145℃, volume shrinkage 3.9%, compressive strength 72MPa, shear strength 15.6MPa. The gel time was as long as 120 minutes and curing was incomplete (Shore hardness only 62D). After 100 cycles of gear oil heat cycling at 80℃, interfacial delamination occurred in the repair layer.

[0066] Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A carbon nanoparticle polymer material for repairing gearbox housings in the wind power industry, characterized in that, The material is composed of separately packaged component A and component B, wherein the mass ratio of component A to component B is 100:30~50; Component A comprises, by mass parts: 100 parts of alicyclic epoxy resin; 3-5 parts of spirocyclic carbonate expanding monomers; 2-2.5 parts of 4,4'-diaminobenzoylaniline; 5-10 parts of reactive diluent; 30-50 parts of silica micropowder filler; 1-2 parts of fumed silica; Component B comprises, by mass parts: 50 parts of alicyclic epoxy resin; 2-4 parts of thermal cationic initiator; Accelerator 0.5~1.5 parts; 20-30 parts of silica micropowder filler; The mass ratio of the spirocyclic carbonate expanding monomer to 4,4'-diaminobenzoylaniline is (1.5~2):

1.

2. The carbon nanoparticle polymer material for repairing gearbox housings in the wind power industry according to claim 1, characterized in that, The alicyclic epoxy resin is 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexylcarboxylate.

3. The carbon nanotube polymer material for repairing gearbox housings in the wind power industry according to claim 1, characterized in that, The thermal cationic initiator is diaryliodonium hexafluorophosphate or diaryliodonium hexafluoroantimonate.

4. The carbon nanoparticle polymer material for repairing gearbox housings in the wind power industry according to claim 1, characterized in that, The accelerator is 1-methylimidazole; the active diluent is benzyl alcohol.

5. The carbon nanotube polymer material for repairing gearbox housings in the wind power industry according to claim 1, characterized in that, The silicon micropowder filler is 800-mesh acid-washed silicon micropowder; the fumed silica is hydrophobic fumed silica.

6. A method for preparing a carbon nanoparticle polymer material for repairing gearbox housings in the wind power industry according to any one of claims 1-5, characterized in that, Includes the following steps: Preparation of component A: (1) Add 100 parts of alicyclic epoxy resin and 5-10 parts of reactive diluent to the reaction vessel, heat to 60-70℃, add 2-2.5 parts of 4,4'-diaminobenzoylaniline, and stir to dissolve for 30 minutes; (2) Cool down to 40~50℃, add 3~5 parts of spiro ring expanded monomer, and stir for 15 minutes; (3) Cool down to below 40°C, add 30-50 parts of silica micropowder filler and 1-2 parts of fumed silica in batches, and disperse at high speed of 1000-1500 rpm for 30 minutes; (4) Degas for 30 minutes under a vacuum degree ≤ -0.095MPa, then seal and package. Preparation of component B: (1) Add 50 parts of alicyclic epoxy resin, 2-4 parts of hot cationic initiator and 0.5-1.5 parts of accelerator to the mixing tank, and stir at room temperature for 15 minutes; (2) Add 20-30 parts of silica micropowder filler in batches under stirring conditions, and disperse at high speed of 1000-1500 rpm for 20 minutes; (3) Degas for 30 minutes under vacuum conditions ≤ -0.095MPa, and then seal in a light-proof package.

7. A rapid repair method using the carbon nanopolymer material according to any one of claims 1-5, characterized in that, Includes the following steps: (1) Surface treatment: Mechanically grind the defective parts of the gearbox housing until the surface roughness Ra≥5μm, clean with acetone and ethanol in sequence, and dry with hot air to a surface temperature of 60~80℃; (2) Primer application: Mix component A and component B at a mass ratio of 100:30~50 evenly, apply a primer layer with a thickness of 0.5~1.0 mm to the defect surface, and let it stand to wet for 5~10 minutes; (3) Main filling: Apply repair material in layers, compact and vent after each layer is filled, with an interval of 20-30 minutes between layers, until the defect is filled; (4) Curing: Curing at room temperature of 15~35℃ for 6~8 hours to reach machinable strength, and reaching more than 90% of the final strength in 24 hours; (5) Post-processing: The cured repair layer is machined to restore it to the design dimensions.

8. The rapid repair method for carbon nanopolymer materials according to claim 7, characterized in that, When applying coating in layers, the thickness of each layer should be ≤8mm.

9. The rapid repair method for carbon nanopolymer materials according to claim 7, characterized in that, In step (4), when the ambient temperature is below 10°C, infrared heating lamps are used to assist curing, and the temperature of the repaired surface is controlled at 50~60°C for 2~3 hours.

10. The rapid repair method for carbon nanopolymer materials according to claim 7, characterized in that, The volume shrinkage rate of the cured material is ≤1.2%, and the internal curing peak temperature is ≤80℃ when the thickness of a single coating is 10mm.

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