In-situ reinforced shaft repair carbon nanopolymer material preparation method and rapid repair method

Abstract

This application belongs to the field of nanocomposite materials technology, specifically providing a method for preparing and rapidly repairing in-situ reinforced shaft repair carbon nanopolymer materials. The method for preparing an in-situ reinforced shaft repair carbon nanopolymer material includes the following steps: S1, mixing phenolic resin and cashew phenol benzoxazine resin, adding solvent, and stirring until homogeneous to obtain a mixed resin solution; S2, sequentially adding functional filler, modified multi-walled carbon nanotubes, defoamer, leveling agent, and antioxidant to the mixed resin solution, dispersing and mixing at high speed, and removing the solvent under vacuum; adding a composite catalyst before application, and mixing to obtain the in-situ reinforced shaft repair carbon nanopolymer material. The in-situ reinforced shaft repair carbon nanopolymer material obtained by this application possesses self-healing, high toughness, wear resistance, and low shrinkage properties.

Description

Technical Field

[0001] This application belongs to the field of nanocomposite materials technology, and in particular relates to a method for preparing and rapidly repairing carbon nanopolymer materials for in-situ reinforced shaft repair. Background Technology

[0002] As core components of transmission equipment, shafts directly affect the performance and reliability of the equipment. During long-term service, shafts are subjected to multiple adverse factors such as alternating loads, vibration, thermal cycling, and corrosive media, making wear a common and serious problem. Carbon nanoparticle polymer composites, as a new generation of repair materials, use thermosetting resins as the matrix and carbon nanomaterials and functional fillers as reinforcing phases. They combine the lightweight and plasticity of polymers with the high hardness and strength of metals, while also exhibiting high wear resistance and high lubricity, showing great application potential in the field of shaft wear repair. However, the poor compatibility between carbon nanomaterials and the resin matrix leads to uneven dispersion, resulting in poor stability of the repair material.

[0003] To address the aforementioned issues, patent application CN112940581A discloses a carbon nanotube-modified coating material. This application uses phenolic resin as a matrix, silicon carbide and ferric chloride as auxiliary solvents, and adds carbon nanotubes, silane coupling agents and hardeners for modification. The resulting coating material overcomes the problems of poor compatibility and inability to uniformly disperse existing coating materials.

[0004] Although the compatibility issue was resolved in the aforementioned documents, phenolic resins have low strength, high brittleness, and poor toughness, making them prone to cracking under alternating loads, and they cannot self-repair microcracks. Summary of the Invention

[0005] To address the aforementioned issues and further improve the toughness of phenolic resin, this application provides a method for preparing in-situ reinforced carbon nanopolymer materials for shaft repair and a rapid repair method.

[0006] This application first provides a method for preparing an in-situ reinforced shaft repair carbon nanopolymer material, comprising the following steps: S1, mixing phenolic resin and cashew phenol benzoxazine resin, adding solvent, stirring evenly to obtain a mixed resin solution; S2, sequentially adding functional filler, modified multi-walled carbon nanotubes, defoamer, leveling agent and antioxidant to the mixed resin solution, dispersing and mixing at high speed and removing solvent under vacuum, adding a composite catalyst before application, and mixing to obtain an in-situ reinforced shaft repair carbon nanopolymer material; wherein the modified multi-walled carbon nanotubes are prepared by hydroxylated multi-walled carbon nanotubes, bis-[3-(triethoxysilyl)propyl]tetrasulfide and titanate coupling agent.

[0007] Furthermore, the in-situ reinforced shaft repair carbon nanopolymer material comprises the following components by weight: 40-50 parts phenolic resin, 16-20 parts cashew phenol benzoxazine resin, 1-5 parts modified multi-walled carbon nanotubes, 15-20 parts functional filler, 2-4 parts composite catalyst, 0.2-0.6 parts defoamer, 0.1-0.5 parts leveling agent, and 0.1-0.8 parts antioxidant.

[0008] Furthermore, the preparation method of the cashew phenol benzoxazine resin includes the following steps: it is prepared by reacting cashew phenol, 3-aminopropyltriethoxysilane and paraformaldehyde.

[0009] Furthermore, the preparation method of the modified multi-walled carbon nanotubes includes the following steps: A1, hydroxylated multi-walled carbon nanotubes are prepared by negative pressure loading of bis-[3-(triethoxysilyl)propyl]tetrasulfide to obtain supported multi-walled carbon nanotubes; A2, the supported multi-walled carbon nanotubes and titanate coupling agent are reacted by ultrasonic dispersion and heat treatment to obtain modified multi-walled carbon nanotubes.

[0010] Furthermore, in A2, the amount of titanate coupling agent added is 0.5-2 wt% of the supported multi-walled carbon nanotubes.

[0011] Furthermore, the functional filler comprises the following components by weight: 8-13 parts of nano-alumina, 3-7 parts of polytetrafluoroethylene, and 1-3 parts of silicon carbide.

[0012] Furthermore, in S1, the mass fraction of the mixed resin is 11-13%.

[0013] Furthermore, in S2, the composite catalyst includes 4-dimethylaminopyridine and ethanolamine.

[0014] Furthermore, the mass ratio of 4-dimethylaminopyridine to ethanolamine in the composite catalyst is 3-5:7.

[0015] Furthermore, this application provides a rapid repair method for using in-situ reinforced carbon nanotube polymer material for shaft repair, comprising the following steps: 1) degreasing and grinding the surface of the shaft part to be repaired in sequence; 2) cleaning and drying the ground surface; 3) coating the carbon nanotube polymer material onto the surface and heating to cure; 4) precision machining the material to the design dimensions and then grinding the material surface.

[0016] Compared with the prior art, this application has the following beneficial effects: 1. This application describes a method for loading bis-[3-(triethoxysilyl)propyl]tetrasulfide into the lumen of hydroxylated multi-walled carbon nanotubes using a negative pressure method, followed by surface modification with a titanate coupling agent to obtain modified multi-walled carbon nanotubes. The long-chain alkyl groups in the titanate coupling agent can effectively improve the dispersibility of carbon nanotubes in the resin matrix and reduce agglomeration. During service, mechanical damage or environmental moisture promotes the hydrolysis and release of bis-[3-(triethoxysilyl)propyl]tetrasulfide, which condenses to form silanols that then form covalent bonds with the metal surface and resin matrix, enhancing the bonding force. In addition, frictional heat generated during service can activate the dynamic exchange of disulfide bonds, dissipate stress, and repair cracks.

[0017] 2. This application synthesizes cashew phenol benzoxazine resin through the reaction of cashew phenol, amine compounds, and paraformaldehyde. Its molecular structure contains both a thermally ring-opening oxazine ring and flexible unsaturated long side chains of cashew phenol. During the co-curing reaction of the mixed resin, the oxazine ring in the cashew phenol benzoxazine resin replaces part of the phenolic hydroxyl group. The free phenolic hydroxyl group can catalyze the ring-opening and reduce the curing temperature of the copolymer. The tertiary amine group generated after ring-opening can catalyze the curing of the phenolic resin. The addition of a composite catalyst of 4-dimethylaminopyridine and ethanolamine can reduce the ring-opening polymerization temperature. The cross-linking of cashew phenol with phenolic resin is beneficial to the formation of an interpenetrating network structure, which improves the interaction between the phenolic resin matrix and the filler. In addition, the addition of cashew phenol introduces flexible branches, which improves the toughness of the resin, reduces its brittleness, alleviates stress concentration, and hinders crack propagation.

[0018] 3. This application modifies multi-walled carbon nanotubes and cashew phenol benzoxazine resin, and supplements them with silicon carbide, nano alumina and polytetrafluoroethylene multi-component synergy, so that the carbon nanopolymer material prepared in this application has self-healing, high toughness, wear resistance and low shrinkage properties. Attached Figure Description

[0019] Figure 1 The infrared spectrum of the cashew phenol benzoxazine resin in Example 2 is shown.

[0020] Figure 2 The image shows the XRD pattern of the modified multi-walled carbon nanotubes from Example 2. Detailed Implementation

[0021] To make the inventive objectives, technical solutions, and beneficial effects of this application clearer, the following detailed description is provided in conjunction with embodiments. Obviously, the described embodiments are only a portion of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0023] When using “including,” “having,” and “contains” as described herein, the intention is to cover non-exclusive inclusion, unless an explicit qualifying term such as “only” is used, in which case another component may be added.

[0024] In this application, "at least one" means one or more, such as one, two, or more. "Multiple" or "several" means at least two, such as two, three, etc., and "multi-layered" means at least two layers, such as two layers, three layers, etc., unless otherwise explicitly specified. In the description of this application, "several" means at least one, such as one, two, etc., unless otherwise explicitly specified.

[0025] When a numerical range is disclosed herein, the range is considered continuous and includes the minimum and maximum values ​​of the range, as well as every value between the minimum and maximum values. Furthermore, when the range refers to integers, it includes every integer between the minimum and maximum values ​​of the range. Additionally, when multiple ranges are provided to describe a feature or characteristic, the ranges may be combined. In other words, unless otherwise specified, all ranges disclosed herein should be understood to include any and all subranges to which they are incorporated.

[0026] Unless otherwise specified, all steps in this application may be performed sequentially or randomly. For example, the method comprising steps (a) and (b) indicates that the method may include steps (a) and (b) performed sequentially, or it may include steps (b) and (a) performed sequentially. For example, the mention that the method may also include step (c) indicates that step (c) may be added to the method in any order; for example, the method may include steps (a), (b), and (c), or it may include steps (a), (c), and (b), or it may include steps (c), (a), and (b), etc. Unless otherwise stated, singular terms may include plural forms and should not be construed as having a quantity of one.

[0027] The present application will be further illustrated by the following examples, but these examples do not limit the scope of the present application.

[0028] When numerical ranges are given in the embodiments, it should be understood that, unless otherwise stated in this application, both endpoints of each numerical range and any value between the two endpoints may be selected. Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art. Where specific conditions are not specified in the embodiments, conventional conditions or conditions recommended by the manufacturer shall apply. All reagents or instruments whose manufacturers are not specified are conventional products that can be purchased commercially. In addition to the specific methods, equipment, and materials used in the embodiments, based on the knowledge of the prior art possessed by one of ordinary skill in the art and the description in this application, any prior art methods, equipment, and materials similar to or equivalent to those described, used, or made by the methods, equipment, and materials in the embodiments of this application may be used to implement this application.

[0029] Example 1 The in-situ reinforced shaft repair carbon nanotube polymer in this embodiment comprises the following components by weight: 400g thermosetting phenolic resin, 160g cashew phenol benzoxazine resin, 15g modified multi-walled carbon nanotubes, 150g functional filler, 8.3g 4-dimethylaminopyridine, 11.62g ethanolamine, 2g defoamer, 1g leveling agent, and 3g antioxidant.

[0030] The preparation method of the in-situ reinforced shaft repair carbon nanopolymer material in this embodiment is as follows: S1. Thermosetting phenolic resin and cashew phenol benzoxazine resin are mixed, acetone is added (resin mass fraction is controlled at 11%), and the mixture is stirred at 70°C for 3 hours until completely dissolved to obtain a mixed resin solution.

[0031] S2, add defoamer and modified multi-walled carbon nanotubes to the mixed resin solution and stir for 10 min; add 80 g of nano alumina and stir for 10 min; then add 40 g of polytetrafluoroethylene, 30 g of silicon carbide, leveling agent and antioxidant and continue stirring for 40 min. Mix the above mixture in a high-speed disperser at 50 °C for 3 h to ensure that all components are uniformly dispersed. Vacuum dry to remove acetone; before coating at the construction site, mix 4-dimethylaminopyridine and ethanolamine and add them, then stir and mix to obtain the in-situ reinforced shaft repair carbon nanopolymer material.

[0032] The preparation method of cashew phenol benzoxazine resin in this embodiment is as follows: 7.03 g of 3-aminopropyltriethoxysilane, 1.93 g of paraformaldehyde, and 100 mL of 1,4-dioxane were added to a flask. Separately, 9.68 g of cashew phenol was dissolved in 20 mL of 1,4-dioxane and added dropwise to the flask. The temperature was raised to 90 °C, and the reaction was carried out for 8 h. After the reaction was completed, 1,4-dioxane was removed by rotary evaporation to obtain cashew phenol benzoxazine resin.

[0033] The method for preparing the modified multi-walled carbon nanotubes in this embodiment is as follows: A1. Weigh 1g of bis-[3-(triethoxysilyl)propyl]tetrasulfide and slowly add it to 100mL of anhydrous ethanol. Add 1g of hydroxylated multi-walled carbon nanotubes, stir and sonicate for 15min, then transfer to a three-necked flask. Control the temperature at 25℃ and the negative pressure at 0.1MPa, stir for 50min, release the pressure and stir for 10min, repeat five times, and dry to obtain supported multi-walled carbon nanotubes.

[0034] A2, weigh 1g of supported multi-walled carbon nanotubes and 10mg of titanate coupling agent (NDZ-102) and dissolve them in 30mL of anhydrous ethanol. After sonication for 2h, dry at 80℃. After evaporating the solvent, place in a vacuum oven and react at 120℃ for 2h to obtain modified multi-walled carbon nanotubes.

[0035] Example 2 The in-situ reinforced shaft repair carbon nanopolymer material in this embodiment comprises the following components by weight: 450g thermosetting phenolic resin, 180g cashew phenol benzoxazine resin, 20g modified multi-walled carbon nanotubes, 180g functional filler, 9g 4-dimethylaminopyridine, 21g ethanolamine, 4g defoamer, 2g leveling agent, and 5g antioxidant.

[0036] The preparation method of the in-situ reinforced shaft repair carbon nanopolymer material in this embodiment is as follows: S1. Mix thermosetting phenolic resin and cashew phenol benzoxazine resin, add acetone (control the resin mass fraction to be 12%), stir at 70°C for 3 hours until completely dissolved to obtain a mixed resin solution.

[0037] S2, add defoamer and modified multi-walled carbon nanotubes to the mixed resin solution and stir for 10 min; add 100 g of nano alumina and stir for 10 min; then add 50 g of polytetrafluoroethylene, 30 g of silicon carbide, leveling agent and antioxidant and continue stirring for 40 min. Stir the above mixture in a high-speed disperser at 50 °C for 3 h to ensure that all components are uniformly dispersed. Vacuum dry to remove acetone; before coating at the construction site, mix 4-dimethylaminopyridine and ethanolamine and add them, then stir and mix to obtain in-situ reinforced shaft repair carbon nanopolymer material.

[0038] The preparation method of cashew phenol benzoxazine resin in this embodiment is as follows: 7.03 g of 3-aminopropyltriethoxysilane, 1.93 g of paraformaldehyde, and 100 mL of 1,4-dioxane were added to a flask. Separately, 9.68 g of cashew phenol was dissolved in 20 mL of 1,4-dioxane and added dropwise to the flask. The temperature was raised to 90 °C, and the reaction was carried out for 8 h. After the reaction was completed, 1,4-dioxane was removed by rotary evaporation to obtain cashew phenol benzoxazine resin.

[0039] The method for preparing the modified multi-walled carbon nanotubes in this embodiment is as follows: A1. Weigh 1g of bis-[3-(triethoxysilyl)propyl]tetrasulfide and slowly add it to 100mL of anhydrous ethanol. Add 1g of hydroxylated multi-walled carbon nanotubes, stir and sonicate for 15min, then transfer to a three-necked flask. Control the temperature at 25℃ and the negative pressure at 0.1MPa, stir for 50min, release the pressure and stir for 10min, repeat five times, and dry to obtain supported multi-walled carbon nanotubes.

[0040] A2, weigh 1g of supported multi-walled carbon nanotubes and 15mg of titanate coupling agent (NDZ-102) and dissolve them in 30mL of anhydrous ethanol. After sonication for 2h, dry at 80℃. After evaporating the solvent, place in a vacuum oven and react at 120℃ for 2h to obtain modified multi-walled carbon nanotubes.

[0041] Example 3 The in-situ reinforced shaft repair carbon nanopolymer material in this embodiment comprises the following components by weight: 500g thermosetting phenolic resin, 200g cashew phenol benzoxazine resin, 25g modified multi-walled carbon nanotubes, 200g functional filler, 14.5g 4-dimethylaminopyridine, 25.4g ethanolamine, 6g defoamer, 4g leveling agent, and 6g antioxidant.

[0042] The preparation method of the in-situ reinforced shaft repair carbon nanopolymer material in this embodiment is as follows: S1. Thermosetting phenolic resin and cashew phenol benzoxazine resin are mixed, acetone is added (resin mass fraction is controlled at 13%), and the mixture is stirred at 70°C for 3 hours until completely dissolved to obtain a mixed resin solution.

[0043] S2, add defoamer and modified multi-walled carbon nanotubes to the mixed resin solution and stir for 10 min; add 120 g of nano alumina and stir for 10 min; then add 50 g of polytetrafluoroethylene, 30 g of silicon carbide, leveling agent and antioxidant and continue stirring for 40 min. Stir the above mixture in a high-speed disperser at 50 °C for 3 h to ensure that all components are uniformly dispersed. Vacuum dry to remove acetone; before coating at the construction site, mix 4-dimethylaminopyridine and ethanolamine and add them, then stir and mix to obtain in-situ reinforced shaft repair carbon nanopolymer material.

[0044] The preparation method of cashew phenol benzoxazine resin in this embodiment is as follows: 7.03 g of 3-aminopropyltriethoxysilane, 1.93 g of paraformaldehyde, and 100 mL of 1,4-dioxane were added to a flask. Separately, 9.68 g of cashew phenol was dissolved in 20 mL of 1,4-dioxane and added dropwise to the flask. The temperature was raised to 90 °C, and the reaction was carried out for 8 h. After the reaction was completed, 1,4-dioxane was removed by rotary evaporation to obtain cashew phenol benzoxazine resin.

[0045] The method for preparing the modified multi-walled carbon nanotubes in this embodiment is as follows: A1. Weigh 1g of bis-[3-(triethoxysilyl)propyl]tetrasulfide and slowly add it to 100mL of anhydrous ethanol. Add 1g of hydroxylated multi-walled carbon nanotubes, stir and sonicate for 15min, then transfer to a three-necked flask. Control the temperature at 25℃ and the negative pressure at 0.1MPa, stir for 50min, release the pressure and stir for 10min, repeat five times, and dry to obtain supported multi-walled carbon nanotubes.

[0046] A2, weigh 1g of supported multi-walled carbon nanotubes and 20mg of titanate coupling agent (NDZ-102) and dissolve them in 30mL of anhydrous ethanol. After sonication for 2h, dry at 80℃. After evaporating the solvent, place in a vacuum oven and react at 120℃ for 2h to obtain modified multi-walled carbon nanotubes.

[0047] Comparative Example 1 The in-situ reinforced shaft repair carbon nanotube polymer material in this comparative example comprises the following components by weight: 630g thermosetting phenolic resin, 20g modified multi-walled carbon nanotubes, 180g functional filler, 9g 4-dimethylaminopyridine, 21g ethanolamine, 4g defoamer, 2g leveling agent, and 5g antioxidant.

[0048] The preparation method of the in-situ reinforced shaft repair carbon nanopolymer material in this comparative example is as follows: S1. Take thermosetting phenolic resin, add acetone (control the resin mass fraction to 12%), stir at 70℃ for 3 hours until completely dissolved to obtain a resin solution.

[0049] S2, add defoamer and modified multi-walled carbon nanotubes to the mixed resin solution and stir for 10 min; add 100 g of nano alumina and stir for 10 min; then add 50 g of polytetrafluoroethylene, 30 g of silicon carbide, leveling agent and antioxidant and continue stirring for 40 min. Stir the above mixture in a high-speed disperser at 50 °C for 3 h to ensure that all components are uniformly dispersed. Vacuum dry to remove acetone; before coating at the construction site, mix 4-dimethylaminopyridine and ethanolamine and add them, then stir and mix to obtain in-situ reinforced shaft repair carbon nanopolymer material.

[0050] The preparation method of the modified multi-walled carbon nanotubes in this comparative example is as follows: A1. Weigh 1g of bis-[3-(triethoxysilyl)propyl]tetrasulfide and slowly add it to 100mL of anhydrous ethanol. Add 1g of hydroxylated multi-walled carbon nanotubes, stir and sonicate for 15min, then transfer to a three-necked flask. Control the temperature at 25℃ and the negative pressure at 0.1MPa, stir for 50min, release the pressure and stir for 10min, repeat five times, and dry to obtain supported multi-walled carbon nanotubes.

[0051] A2, weigh 1g of supported multi-walled carbon nanotubes and 15mg of titanate coupling agent (NDZ-102) and dissolve them in 30mL of anhydrous ethanol. After sonication for 2h, dry at 80℃. After evaporating the solvent, place in a vacuum oven and react at 120℃ for 2h to obtain modified multi-walled carbon nanotubes.

[0052] Comparative Example 2 The in-situ reinforced shaft repair carbon nanopolymer material in this comparative example comprises the following components by weight: 450g thermosetting phenolic resin, 180g cashew phenol benzoxazine resin, 20g multi-walled carbon nanotubes, 180g functional filler, 9g 4-dimethylaminopyridine, 21g ethanolamine, 4g defoamer, 2g leveling agent, and 5g antioxidant.

[0053] The preparation method of the in-situ reinforced shaft repair carbon nanopolymer material in this comparative example is as follows: S1. Mix thermosetting phenolic resin and cashew phenol benzoxazine resin, add acetone (control the resin mass fraction to be 12%), stir at 70°C for 3 hours until completely dissolved to obtain a mixed resin solution.

[0054] S2, add defoamer and modified multi-walled carbon nanotubes to the mixed resin solution and stir for 10 min; add 100 g of nano alumina and stir for 10 min; then add 50 g of polytetrafluoroethylene, 30 g of silicon carbide, leveling agent and antioxidant and continue stirring for 40 min. Stir the above mixture in a high-speed disperser at 50 °C for 3 h to ensure that all components are uniformly dispersed. Vacuum dry to remove acetone; before coating at the construction site, mix 4-dimethylaminopyridine and ethanolamine and add them, then stir and mix to obtain in-situ reinforced shaft repair carbon nanopolymer material.

[0055] The preparation method of the cashew phenol benzoxazine resin in this comparative example is as follows: 7.03 g of 3-aminopropyltriethoxysilane, 1.93 g of paraformaldehyde, and 100 mL of 1,4-dioxane were added to a flask. Separately, 9.68 g of cashew phenol was dissolved in 20 mL of 1,4-dioxane and added dropwise to the flask. The temperature was raised to 90 °C, and the reaction was carried out for 8 h. After the reaction was completed, 1,4-dioxane was removed by rotary evaporation to obtain cashew phenol benzoxazine resin.

[0056] Performance testing Samples were prepared by coating and curing carbon nanopolymer materials for in-situ reinforced shaft repair.

[0057] The adhesion of carbon nanopolymers was tested according to GB / T 9286-2021; the impact resistance of carbon nanopolymers was tested according to GB / T1732-2020; the self-healing performance of carbon nanopolymers was tested according to T / CSCP0003-2023, with self-healing efficiency = cross-sectional area of ​​the scratch after repair / cross-sectional area of ​​the original scratch; and the flexural strength of carbon nanopolymers was tested according to GB / T 9341-2008.

[0058] Analyze Examples 1-3 and Comparative Examples 1-2, in conjunction with Table 1 and Figures 1-2 It can be seen that the synergistic effect of cashew phenol benzoxazine resin and modified multi-walled carbon nanotubes can effectively enhance the adhesion, self-healing efficiency, impact resistance and flexural strength of carbon nanopolymer materials.

[0059] Compared to Examples 1-3, the carbon nanopolymer material prepared in Comparative Example 1 did not contain cashew phenol benzoxazine resin, lacking the toughening effect of flexible long side chains and the low shrinkage characteristics of benzoxazine. This resulted in increased brittleness and curing shrinkage stress, leading to a significant decrease in the flexural strength and impact resistance of Comparative Example 1, as well as a reduction in adhesion. Compared to Examples 1-3, the carbon nanopolymer material prepared in Comparative Example 2 did not have the multi-walled carbon nanotubes modified, lacked the self-healing bis-[3-(triethoxysilyl)propyl]tetrasulfide, and was not modified with a titanate coupling agent, thus failing to effectively repair itself. Consequently, Comparative Example 2 lacked self-healing ability.

[0060] Table 1. Performance test results of carbon nanopolymer materials in Examples 1-3 and Comparative Examples 1-2 analyze Figure 1 It can be observed that cashew phenol benzoxazine resin, compared to cashew phenol, has a lower concentration at 3350 cm⁻¹. -1 The -OH characteristic peaks at 1230 and 1120 cm⁻¹ disappear. -1 The asymmetric and symmetric tensile vibration peaks of the COC of the oxazine ring appear at 1076 cm⁻¹. -1 An asymmetric tensile vibration peak of Si-OC appears at 956 cm⁻¹. -1 The presence of oxazine ring characteristic peaks proves that cashew phenol benzoxazine resin was successfully synthesized.

[0061] analyze Figure 2 It can be observed that the main diffraction peaks of the modified multi-walled carbon nanotubes are basically the same as those of the multi-walled carbon nanotubes, but the peak intensity decreases, indicating that the structure of the modified multi-walled carbon nanotubes is not destroyed before and after loading, and some bis-[3-(triethoxysilyl)propyl]tetrasulfide is loaded in the lumen.

[0062] 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 method for preparing in-situ reinforced shaft-repairing carbon nanopolymer materials, characterized in that, The process includes the following steps: S1, mixing phenolic resin and cashew phenol benzoxazine resin, adding solvent, and stirring until homogeneous to obtain a mixed resin solution; S2, sequentially adding functional filler, modified multi-walled carbon nanotubes, defoamer, leveling agent, and antioxidant to the mixed resin solution, dispersing and mixing at high speed and removing solvent under vacuum, adding a composite catalyst before application, and mixing to obtain an in-situ reinforced shaft repair carbon nanopolymer material; The modified multi-walled carbon nanotubes are prepared by combining hydroxylated multi-walled carbon nanotubes, bis-[3-(triethoxysilyl)propyl]tetrasulfide, and titanate coupling agent.

2. The method for preparing an in-situ reinforced shaft-like repair carbon nanopolymer material according to claim 1, characterized in that, The in-situ reinforced shaft repair carbon nanopolymer material comprises the following components by weight: 40-50 parts phenolic resin, 16-20 parts cashew phenol benzoxazine resin, 1-5 parts modified multi-walled carbon nanotubes, 15-20 parts functional filler, 2-4 parts composite catalyst, 0.2-0.6 parts defoamer, 0.1-0.5 parts leveling agent, and 0.1-0.8 parts antioxidant.

3. The method for preparing an in-situ reinforced shaft-like repair carbon nanopolymer material according to claim 2, characterized in that, The preparation method of the cashew phenol benzoxazine resin includes the following steps: it is prepared by reacting cashew phenol, 3-aminopropyltriethoxysilane and paraformaldehyde.

4. The method for preparing an in-situ reinforced shaft-like repair carbon nanopolymer material according to claim 1, characterized in that, The method for preparing the modified multi-walled carbon nanotubes includes the following steps: A1, hydroxylated multi-walled carbon nanotubes are prepared by negative pressure loading of bis-[3-(triethoxysilyl)propyl]tetrasulfide to obtain supported multi-walled carbon nanotubes; A2, the supported multi-walled carbon nanotubes and titanate coupling agent are reacted by ultrasonic dispersion and heat treatment to obtain modified multi-walled carbon nanotubes.

5. The method for preparing an in-situ reinforced shaft-type repair carbon nanopolymer material according to claim 4, characterized in that, In A2, the amount of titanate coupling agent added is 0.5-2 wt% of the supported multi-walled carbon nanotubes.

6. The method for preparing an in-situ reinforced shaft-like repair carbon nanopolymer material according to claim 2, characterized in that, The functional filler comprises the following components by weight: 8-13 parts nano-alumina, 3-7 parts polytetrafluoroethylene, and 1-3 parts silicon carbide.

7. The method for preparing an in-situ reinforced shaft-like repair carbon nanopolymer material according to claim 1, characterized in that, In S1, the mass fraction of the mixed resin is 11-13%.

8. The method for preparing an in-situ reinforced shaft-like repair carbon nanopolymer material according to claim 1, characterized in that, In S2, the composite catalyst includes 4-dimethylaminopyridine and ethanolamine.

9. The method for preparing an in-situ reinforced shaft-like repair carbon nanopolymer material according to claim 8, characterized in that, The mass ratio of 4-dimethylaminopyridine to ethanolamine in the composite catalyst is 3-5:

7.

10. A rapid repair method, characterized in that, The in-situ reinforced carbon nanotube polymer material for shaft repair prepared by the preparation method described in claim 1 is used for the repair of shaft parts, comprising the following steps: 1) the surface of the shaft part to be repaired is degreased and polished in sequence; 2) the polished surface is cleaned and then dried; 3) the carbon nanotube polymer material is coated on the surface and heated to cure; 4) the material is precision machined to the design size and then the surface of the material is polished.

Images