Carbon fiber fan blade material for unmanned aerial vehicle

Abstract

The invention relates to the technical field of unmanned aerial vehicle component materials, in particular to an unmanned aerial vehicle carbon fiber fan blade material which is prepared from the following components in parts by weight: 60-70 parts of a carbon material, 20-30 parts of modified epoxy resin, 5-10 parts of nano hydrophobic silicon dioxide and 1-3 parts of an antioxidant. According to the invention, the carbon fiber is used as a main body reinforcing material to endow the fan blade with high strength and good rigidity and ensure the structural stability of the fan blade under high-speed rotation, and the modified epoxy resin plays a role in bonding the carbon fiber on one hand, has low water absorption after special modification treatment and effectively prevents external moisture from permeating into the material, so that the service life of the fan blade is prolonged, and the service life of the fan blade is prolonged. The nano hydrophobic silicon dioxide is uniformly dispersed in a material system, a layer of microcosmic hydrophobic structure is formed on the surface of the material, the adhesion and absorption probability of moisture on the fan blade is greatly reduced, the antioxidant is used for preventing performance degradation caused by oxidation in the long-term use process of the material, and the service life of the fan blade is prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of unmanned aerial vehicle component materials, in particular to a carbon fiber fan blade material for unmanned aerial vehicles. BACKGROUND

[0002] With the continuous development of unmanned aerial vehicle technology, large unmanned aerial vehicles play an increasingly important role in many fields such as logistics transportation, high-altitude detection, etc. However, the existing fan blade materials for unmanned aerial vehicles mostly have the defect of strong water absorption. When the unmanned aerial vehicle flies in a low-altitude environment with high humidity or encounters rainy weather, the fan blade is easy to absorb water, causing the material to swell. This not only changes the original structure and aerodynamic performance of the fan blade, reduces the flight efficiency, but also may cause the unbalanced rotation of the fan blade, increase the instability of the unmanned aerial vehicle flight, and even cause safety hazards. Especially in high-altitude low-temperature, high-humidity environments, the condensation and absorption of water further aggravate this problem, seriously restricting the performance of large unmanned aerial vehicles and the expansion of their application range. SUMMARY

[0003] The present application aims to provide a new carbon fiber fan blade material for unmanned aerial vehicles to effectively solve the problems of water absorption and swelling of large unmanned aerial vehicle fans, and high-altitude water absorption, and to improve the reliability and stability of unmanned aerial vehicle flight.

[0004] To achieve the above-mentioned purpose, the present application provides the following technical scheme:

[0005] A carbon fiber fan blade material for unmanned aerial vehicles, which is made of the following components by weight: carbon material 60-70 parts, modified epoxy resin 20-30 parts, nano-hydrophobic silicon dioxide 5-10 parts, antioxidant 1-3 parts.

[0006] The antioxidant is composed of dilauryl thiodipropionate, tetra[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid]pentaerythritol ester, and dioctadecyl thiodipropionate in a mass ratio of 1:(1-2):(2-5).

[0007] As a further preferred embodiment of the present application, the preparation method of the modified epoxy resin is as follows:

[0008] 1) Epoxy resin and silane coupling agent KH-550 are sequentially added to a container and reacted at 80-83℃ for 3-5h. After the reaction is completed, hydroxyl-terminated polydimethylsiloxane and dibutyl tin dilaurate are sequentially added to the reaction product, and then continuous stirring at 1500-2000r / min is carried out for 20-30min to obtain a silicone-based epoxy resin.

[0009] 2) At normal temperature, silane coupling agent KH-560, phenyl trimethoxysilane and dodecyl trimethoxysilane are added into a container, an aqueous acetic acid solution with pH value of 3 is slowly added dropwise while stirring, then the temperature is raised to 60-65℃, acetone and toluene are added, and the reaction is continuously carried out for 6-8h, after the reaction is completed, the product is subjected to rotary evaporation for 40-60min to obtain modified polysiloxane;

[0010] 3) The organosilicon-based epoxy resin and the modified polysiloxane are added into a container, and after being uniformly mechanically stirred at normal temperature, a dimer acid type polyamide curing agent is added, and after being fully stirred, the mixture is poured into a mold, vacuum degassing is carried out until no bubbles come out, then curing is carried out for 2-3h, and the mixture is left to stand at room temperature for 7-10d to obtain the modified epoxy resin.

[0011] Further, in step 1), the mass ratio of the epoxy resin to silane coupling agent KH-550 is (10-13):1;

[0012] The addition amount of the hydroxyl-terminated polydimethylsiloxane and dibutyltin dilaurate is 4-6% and 6-8% of the mass of the reactants, respectively.

[0013] Further, in step 2), the mass ratio of the silane coupling agent KH-560, phenyl trimethoxysilane, dodecyl trimethoxysilane, aqueous acetic acid solution, acetone and toluene is (35.5-42.6):(23.8-34.1):(8.7-9.6):(21.6-30.2):(26.0-30.5):(41.5-46.3);

[0014] The temperature of rotary evaporation is 70-75℃.

[0015] Further, in step 3), the mass ratio of the organosilicon-based epoxy resin, modified polysiloxane and dimer acid type polyamide curing agent is (28.5-36.2):(1.5-2.1):(14.2-15.0);

[0016] The temperature of curing is 70-75℃.

[0017] As a further preferred scheme of the present application, the preparation method of the carbon fiber fan blade material is as follows:

[0018] 1) According to weight parts, each component raw material is weighed, the carbon fiber is pretreated, then the modified epoxy resin is heated to 90-100℃ under stirring to have good fluidity, and the pretreated carbon fiber is slowly added, and the stirring is continuously carried out for 30-60min;

[0019] 2) adding nano-hydrophobic silicon dioxide into the above mixing system, stirring for 20-30 min by using a high-speed dispersion machine, and then adding an antioxidant and continuing to stir for 10-20 min, and then pouring the mixture into a mold and curing to form a carbon fiber fan blade material by using a vacuum-assisted molding process.

[0020] Further, the stirring speed is 100-180 r / min.

[0021] The high-speed dispersion machine has a speed of 1000-1500 rpm.

[0022] As a further preferred embodiment of the present application, the specific operation of the pretreatment of the carbon fiber is as follows:

[0023] 1) ultrasonic cleaning the carbon fiber with ethanol for 20-30 min, then immersing the carbon fiber in concentrated nitric acid, heating to 70-80℃, and continuously stirring for 2-3 h, then washing repeatedly with deionized water until neutral, and drying in an 80-100℃ oven for 3-5 h to obtain acidified carbon fiber;

[0024] 2) dissolving nickel nitrate, cobalt nitrate and urea in deionized water, stirring to form a precursor solution, then uniformly dispersing the acidified carbon fiber into the precursor solution, adding toluene, and then transferring into a reaction kettle, and then performing hydrothermal reaction for 16-20 h, and then performing annealing treatment in an air atmosphere for 3-5 h.

[0025] Further, in step 1), the concentration of the concentrated nitric acid is 68-72 wt%.

[0026] The stirring speed is 150-200 r / min.

[0027] Further, in step 2), the amount ratio of the nickel nitrate, cobalt nitrate, urea, deionized water, acidified carbon fiber and toluene is (3-5) g:(6-10) g:(7-12) g:(60-100) mL:(2-4) g:(200-300) mL.

[0028] The hydrothermal reaction temperature is 110-116℃.

[0029] The annealing treatment temperature is 350-370℃.

[0030] Compared with the prior art, the present application has the following advantages:

[0031] In the application, the epoxy resin is treated by hydroxyl-terminated polydimethylsiloxane to obtain a silicone-based epoxy resin, the introduction of the silicone group can effectively reduce the surface energy of the epoxy resin and improve its hydrophobicity, at the same time, the introduction of the flexible structure of siloxane makes the epoxy resin have a more compact structure, thereby helping to enhance the impact resistance of the epoxy resin; at the same time, the modified polysiloxane containing dodecyl is prepared by hydrolysis and condensation, the epoxy group is introduced to improve the compatibility of the modified polysiloxane and the epoxy resin, and the dodecyl group is introduced to enhance the toughening effect and hydrophobicity, so that the obtained modified epoxy resin has excellent hydrophobicity, good toughness and strong impact resistance; the modified epoxy resin is melted and fully stirred with carbon fibers, so that the modified epoxy resin is attached to the carbon fibers, which are specially modified and have good hydrophobicity, can form a hydrophobic network inside the fan blade material, effectively prevent external moisture from penetrating into the material, and the nano-hydrophobic silicon dioxide is uniformly dispersed in the material system, forming a micro-hydrophobic structure on the surface of the material, when the water droplets contact the surface of the fan blade, they will quickly roll off due to the surface tension, greatly reducing the probability of water droplets adhering and absorbing on the fan blade, and by constructing the internal and external hydrophobic structures, the waterproof effect is greatly improved; at the same time, in order to improve the interfacial strength between the modified epoxy resin and the carbon fibers, the carbon fibers are pretreated in the application, the carbon fibers are etched by using concentrated nitric acid to produce microporous structures and improve the surface roughness, then the acidified carbon fibers are used as a base material, a nickel-cobalt-based precursor is grown on the acidified carbon fibers by a hydrothermal method, and the template is removed by annealing, thereby depositing nanowires, the formed nanowires can not only extend into the modified epoxy resin matrix to increase the crosslinking density of the modified epoxy resin and improve the compactness of the structure, thereby enhancing the strength of the modified epoxy resin, but also the nanowires extending into the modified epoxy resin can play a good connecting role, enhance the interfacial strength between the pretreated carbon fibers and the modified epoxy resin, and improve the adhesion of the modified epoxy resin on the pretreated carbon fibers, by combining the two together, they can not only be used as a main reinforcing material, but also form a network support structure by mutual crosslinking, giving the fan blade high strength and good rigidity, ensuring the structural stability of the fan blade under high-speed rotation, at the same time, the hydrophobicity of the modified epoxy resin gives the network support structure good water-blocking effect, which can effectively prevent external moisture from penetrating into the material, so that the fan blade material has very low water absorption.

[0032] In the present application, carbon fiber is used as the main reinforcing material to give the fan blade high strength and good rigidity, ensuring the structural stability under high-speed rotation, the modified epoxy resin plays a role in bonding carbon fiber, on the other hand, it is treated by special modification and has low water absorption, effectively preventing external moisture from penetrating into the material, nano-hydrophobic silicon dioxide is uniformly dispersed in the material system, forming a micro-hydrophobic structure on the surface of the material, when water droplets contact the surface of the fan blade, they will quickly roll off due to surface tension, greatly reducing the probability of water adhesion and absorption on the fan blade, and the antioxidant is used to prevent performance degradation due to oxidation during long-term use, prolonging the service life of the fan blade. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present application will be described below in a clear and complete manner. Obviously, the described embodiments are only some of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0034] In the embodiments of the present application, the antioxidant is composed of dilauryl thiodipropionate, tetra[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid] pentaerythritol ester, and dioctadecyl thiodipropionate in a mass ratio of 1:2:5.

[0035] Embodiment 1

[0036] A carbon fiber fan blade material for unmanned aerial vehicles is prepared from the following components by weight: carbon material 60 parts, modified epoxy resin 20 parts, nano-hydrophobic silicon dioxide 5 parts, and antioxidant 1 part.

[0037] The preparation method of the carbon fiber fan blade material is as follows:

[0038] 1) According to the weight fraction, the raw materials are weighed, the carbon fiber is pretreated, then the modified epoxy resin is heated to 90 DEG C under the condition of 100 r / min stirring to make it have good fluidity, the pretreated carbon fiber is slowly added, and the stirring is continued for 30 min;

[0039] 2) Nano-hydrophobic silicon dioxide is added to the above-mentioned mixing system, and a high-speed dispersion machine is used to stir at a speed of 1000 rpm for 20 min, and then an antioxidant is added and stirred for 10 min, and after mixing uniformly, the material is injected into a mold, and a vacuum assisted forming process is used for curing and forming, and the carbon fiber fan blade material is obtained;

[0040] The specific operation of pretreating the carbon fiber is as follows:

[0041] 1) carbon fiber is cleaned with ethanol by ultrasonic for 20 min, then immersed in concentrated nitric acid with a concentration of 60 wt%, heated to 70℃, and continuously stirred at 150 r / min for 2 h, after the treatment is completed, washed with deionized water repeatedly until neutral, dried in an oven at 80℃ for 3 h, to obtain acidified carbon fiber;

[0042] 2) 3 g of nickel nitrate, 6 g of cobalt nitrate and 7 g of urea are dissolved in 60 mL of deionized water, after stirring well, a precursor solution is formed, then 2 g of acidified carbon fiber is uniformly dispersed into the precursor solution, 200 mL of toluene is added and then transferred to a reaction kettle, hydrothermal reaction is carried out at 110℃ for 16 h, then annealing treatment is carried out at 350℃ for 3 h in air atmosphere.

[0043] The preparation method of the modified epoxy resin is as follows:

[0044] 1) epoxy resin and silane coupling agent KH-550 are added into a container in a mass ratio of 10:1, respectively, and reacted at 80℃ for 3 h, after the reaction is completed, hydroxyl-terminated polydimethylsiloxane and dibutyltin dilaurate are added into the reaction product in an amount of 4% and 6% of the mass of the reaction product, respectively, then continuously stirred at 1500 r / min for 20 min, to obtain silicone-based epoxy resin;

[0045] 2) at room temperature, 35.5 g of silane coupling agent KH-560, 23.8 g of phenyltrimethoxysilane and 8.7 g of dodecyltrimethoxysilane are added into a container, 21.6 g of acetic acid aqueous solution with a pH value of 3 is slowly added dropwise while stirring, then heated to 60℃, 26.0 g of acetone and 41.5 g of toluene are added, and the reaction is continuously carried out for 6 h, after the reaction is completed, the product is rotary evaporated at 70℃ for 40 min, to obtain modified polysiloxane;

[0046] 3) 28.5 g of silicone-based epoxy resin and 1.5 g of modified polysiloxane are added into a container, uniformly stirred at room temperature, then 14.2 g of dimer acid type polyamide curing agent is added, poured into a mold after fully stirring, vacuum degassing until no bubbles come out, then cured at 70℃ for 2 h, and placed at room temperature for 7 d, to obtain modified epoxy resin.

[0047] Example 2

[0048] A kind of unmanned aerial vehicle carbon fiber fan blade material, modified carbon fiber fan blade material is made of the following components by weight parts: carbon material 65 parts, modified epoxy resin 25 parts, nano-hydrophobic silicon dioxide 7 parts, antioxidant 2 parts;

[0049] The preparation method of the carbon fiber fan blade material is as follows:

[0050] 1) According to the weight fraction, the raw materials of each component are weighed, the carbon fiber is pretreated, then the modified epoxy resin is heated to 95℃ under the condition of stirring at 150 r / min, so that it has good fluidity, the pretreated carbon fiber is slowly added, and the stirring is continued for 50 min;

[0051] 2) Nano-hydrophobic silica is added to the above mixing system, and a high-speed dispersion machine is used to stir at a speed of 1300 rpm for 25 min, then antioxidant is added and continues to stir for 15 min, after uniform mixing, the material is injected into the mold, and the carbon fiber cellulose fan blade material is obtained by vacuum assisted forming process;

[0052] The specific operation of pretreating the carbon fiber is as follows:

[0053] 1) The carbon fiber is ultrasonically cleaned with ethanol for 25 min, then immersed in concentrated nitric acid with a concentration of 65wt%, heated to 75℃, and continuously stirred at 180 r / min for 2.5 h, then washed with deionized water until neutral, dried in a 90℃ oven for 4 h, and acidified carbon fiber is obtained;

[0054] 2) 4g of nickel nitrate, 8g of cobalt nitrate and 10g of urea are dissolved in 80mL of deionized water, and the precursor solution is formed after stirring, then 3g of acidified carbon fiber is uniformly dispersed in the precursor solution, 250mL of toluene is added and transferred to the reaction kettle, hydrothermal reaction is carried out at 115℃ for 18h, then annealing treatment is carried out at 360℃ for 4h in air atmosphere.

[0055] The preparation method of the modified epoxy resin is as follows:

[0056] 1) The epoxy resin and silane coupling agent KH-550 are sequentially added to the container in a mass ratio of 12:1, and reacted at 82℃ for 4h, then hydroxyl-terminated polydimethylsiloxane and dibutyltin dilaurate are added to the reaction product in an amount of 5% and 7% of the mass of the reaction product respectively, then continuously stirred at 1800 r / min for 25 min, and the silicone-based epoxy resin is obtained;

[0057] 2) At room temperature, 38.5g of silane coupling agent KH-560, 28.3g of phenyltrimethoxysilane and 9.2g of dodecyltrimethoxysilane are added to the container, 26.3g of pH 3 acetic acid aqueous solution is slowly added while stirring, then heated to 62℃, 28.5g of acetone and 43.6g of toluene are added, and the reaction is continued for 7h, then the product is rotary evaporated at 72℃ for 50 min, and the modified polysiloxane is obtained;

[0058] 3) 32.0 g of silicone-based epoxy resin and 1.8 g of modified polysiloxane are added to a container, and after being uniformly mechanically stirred at room temperature, 14.7 g of dimer acid type polyamide curing agent is added, and after being fully stirred, it is poured into a mold, vacuum degassing is performed until no bubbles come out, and then curing is performed at 72°C for 2.5 h, and after being left at room temperature for 8 d, a modified epoxy resin is obtained.

[0059] Example 3

[0060] A carbon fiber fan blade material for a drone is made from the following components by weight: carbon material 70 parts, modified epoxy resin 30 parts, nano-hydrophobic silicon dioxide 10 parts, antioxidant 3 parts.

[0061] The preparation method of the carbon fiber fan blade material is as follows:

[0062] 1) According to the weight fraction, the raw materials of each component are weighed, the carbon fiber is pretreated, and then the modified epoxy resin is heated to 100°C under stirring conditions at 180 r / min to have good fluidity, and the pretreated carbon fiber is slowly added, and the stirring is continued for 60 min;

[0063] 2) Nano-hydrophobic silicon dioxide is added to the above-mentioned mixing system, and a high-speed dispersion machine is used to stir at a speed of 1500 rpm for 30 min, and then an antioxidant is added and continues to stir for 20 min, and after being uniformly mixed, the material is injected into a mold, and a vacuum assisted forming process is used for curing and forming, and a carbon fiber fan blade material is obtained.

[0064] The specific operation of pretreating the carbon fiber is as follows:

[0065] 1) The carbon fiber is ultrasonically cleaned with ethanol for 30 min, and then soaked in concentrated nitric acid with a concentration of 70 wt%, heated to 80°C, and continuously stirred at 200 r / min for 3 h, and after the treatment is completed, washed with deionized water until neutral, and dried in a 100°C oven for 5 h to obtain acidified carbon fiber;

[0066] 2) 5 g of nickel nitrate, 10 g of cobalt nitrate, and 12 g of urea are dissolved in 100 mL of deionized water to form a precursor solution, and then 4 g of acidified carbon fiber is uniformly dispersed in the precursor solution, 300 mL of toluene is added, and then transferred to a reaction kettle, hydrothermal reaction is performed at 116°C for 20 h, and then annealing treatment is performed at 370°C for 5 h in an air atmosphere.

[0067] The preparation method of the modified epoxy resin is as follows:

[0068] 1) The epoxy resin and silane coupling agent KH-550 are sequentially added to a container in a mass ratio of 13:1, and reacted at 83°C for 5h. After the reaction is completed, hydroxyl-terminated polydimethylsiloxane and dibutyl tin dilaurate are sequentially added to the reaction product in an amount of 6% and 8% of the mass of the reaction product, respectively. Then, continuous stirring is performed at 2000r / min for 30min, and the silicone-based epoxy resin is obtained.

[0069] 2) At room temperature, 42.6g of silane coupling agent KH-560, 34.1g of phenyltrimethoxysilane, and 9.6g of dodecyltrimethoxysilane are added to a container, and 30.2g of a pH 3 aqueous acetic acid solution is slowly added dropwise while stirring. Then, the temperature is raised to 65°C, 30.5g of acetone and 46.3g of toluene are added, and the reaction is continuously performed for 8h. After the reaction is completed, the product is rotary evaporated at 75°C for 60min, and the modified polysiloxane is obtained.

[0070] 3) 36.2g of the silicone-based epoxy resin and 2.1g of the modified polysiloxane are added to a container, and mechanically stirred uniformly at room temperature. Then, 15.0g of a dimer acid type polyamide curing agent is added, and after being stirred thoroughly, it is poured into a mold, vacuum degassed until no bubbles come out, and then cured at 75°C for 3h, and left at room temperature for 10d, and the modified epoxy resin is obtained.

[0071] Comparative Example 1: This comparative example is basically the same as Example 1, except that the carbon fiber is not pretreated.

[0072] Comparative Example 2: This comparative example is basically the same as Example 1, except that in the pretreatment of the carbon fiber, step 1) is omitted.

[0073] Comparative Example 3: This comparative example is basically the same as Example 1, except that in the pretreatment of the carbon fiber, step 2) is omitted.

[0074] Comparative Example 4: This comparative example is basically the same as Example 1, except that in the preparation of the modified epoxy resin, step 1) is omitted.

[0075] Comparative Example 5: This comparative example is basically the same as Example 1, except that in the preparation of the modified epoxy resin, steps 2)-3) are omitted.

[0076] Test Experiment:

[0077] The carbon fiber fan blade material sample was processed according to the method provided in the examples 1-3 and comparative examples 1-5, the weight Mo of the sample was measured, then the sample was placed in clean water at 20℃, the upper surface of the sample was immersed in water by 2-3mm, the lower surface of the sample was supported by a 10mm steel bar to ensure the water absorption area of the sample; the time was started at the same time when the sample was placed in water, the weight Mn was measured after 24h of immersion, then the water absorption rate of the sample was calculated by the following formula:

[0078]

[0079] The calculation results are shown in Table 1.

[0080] Table 1

[0081] Example 1 Example 2 Example 3 Comparative Example 1 Water absorption % 0.23 0.21 0.26 0.88 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Water absorption % 0.71 0.77 0.63 0.72

[0082] From Table 1, it can be seen that the carbon fiber fan blade material in the application has very low water absorption rate, the fan blade will not swell due to water absorption when flying in a humid low-altitude environment, and the flight stability is good.

[0083] The above disclosed preferred embodiments of the application are only used to help explain the application. The preferred embodiments do not describe all the details and do not limit the application to the specific embodiments described. Obviously, according to the content of the specification, many modifications and changes can be made. The specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the application, so that those skilled in the art can well understand and utilize the application. The application is limited only by the claims and their entire scope and equivalents.

Claims

1. A drone carbon fiber fan blade material, characterized by, The carbon fiber fan blade material is made of the following components by weight: carbon material 60-70 parts, modified epoxy resin 20-30 parts, nano-hydrophobic silicon dioxide 5-10 parts, antioxidant 1-3 parts. The antioxidant is composed of dilauryl thiodipropionate, tetra[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid]pentaerythritol ester, dioctadecyl thiodipropionate in a mass ratio of 1:(1-2):(2-5).

2. The unmanned aerial vehicle carbon fiber fan blade material of claim 1, wherein, The preparation method of the modified epoxy resin is as follows: 1) The epoxy resin and silane coupling agent KH-550 are sequentially added to a container and reacted at 80-83℃ for 3-5h. After the reaction is completed, hydroxyl-terminated polydimethylsiloxane and dibutyl tin dilaurate are sequentially added to the reaction product, and then continuous stirring is carried out at 1500-2000r / min for 20-30min to obtain the silicone-based epoxy resin; 2) At room temperature, the silane coupling agent KH-560, phenyltrimethoxysilane and dodecyltrimethoxysilane are added to a container, and a pH 3 acetic acid aqueous solution is slowly added while stirring. Then, the temperature is raised to 60-65℃, and acetone and toluene are added, and the reaction is continuously carried out for 6-8h. After the reaction is completed, the product is rotary evaporated for 40-60min to obtain the modified polysiloxane; 3) The silicone-based epoxy resin and the modified polysiloxane are added to a container, and after uniform mechanical stirring at room temperature, the dimer acid type polyamide curing agent is added, and after sufficient stirring, it is poured into a mold, vacuum degassing until no bubbles come out, and then cured for 2-3h, and placed at room temperature for 7-10d to obtain the modified epoxy resin.

3. The unmanned aerial vehicle carbon fiber fan blade material of claim 2, wherein, In step 1), the mass ratio of the epoxy resin to the silane coupling agent KH-550 is (10-13):1; The addition amount of the hydroxyl-terminated polydimethylsiloxane and dibutyl tin dilaurate is 4-6% and 6-8% of the mass of the reaction product, respectively.

4. The unmanned aerial vehicle carbon fiber fan blade material of claim 2, wherein, In step 2), the mass ratio of the silane coupling agent KH-560, phenyltrimethoxysilane, dodecyltrimethoxysilane, acetic acid aqueous solution, acetone, toluene is (35.5-42.6):(23.8-34.1):(8.7-9.6):(21.6-30.2):(26.0-30.5):(41.5-46.3); The temperature of the rotary evaporation is 70-75℃.

5. The carbon fiber fan blade material for unmanned aerial vehicles according to claim 2, wherein In step 3), the mass ratio of the silicone-based epoxy resin, the modified polysiloxane, and the dimer acid type polyamide curing agent is (28.5-36.2):(1.5-2.1):(14.2-15.0); The curing temperature is 70-75℃.

6. The unmanned aerial vehicle carbon fiber fan blade material according to any one of claims 1-5, wherein, The preparation method of the carbon fiber fan blade material is as follows: 1) According to the weight fraction, the raw materials of each component are weighed, the carbon fiber is pretreated, and then the modified epoxy resin is heated to 90-100℃ under stirring conditions to have good fluidity, and the pretreated carbon fiber is slowly added, and the stirring is continuously carried out for 30-60min; 2) adding nano-hydrophobic silica into the above mixing system, stirring for 20-30 min by using a high-speed dispersion machine, finally adding an antioxidant, continuing to stir for 10-20 min, after mixing uniformly, injecting the material into a mold, adopting a vacuum-assisted forming process, curing and forming, and then a carbon fiber cellulose fan blade material is obtained.

7. The carbon fiber fan blade material for a drone of claim 6, wherein, The rotating speed of the stirring condition is 100-180 r / min. The rotating speed of the high-speed dispersion machine is 1000-1500 rpm.

8. The carbon fiber fan blade material for a drone of claim 6, wherein, The specific operation of the pretreatment of the carbon fiber is as follows: 1) ultrasonic cleaning the carbon fiber with ethanol for 20-30 min, then immersing in concentrated nitric acid, heating to 70-80℃, and continuously stirring for 2-3 h, after the treatment is completed, repeatedly washing with deionized water until neutral, drying in an 80-100℃ oven for 3-5 h to obtain acidified carbon fiber; 2) dissolving nickel nitrate, cobalt nitrate and urea in deionized water, after fully stirring, forming a precursor solution, then uniformly dispersing the acidified carbon fiber into the above precursor solution, adding toluene and transferring to a reaction kettle, after hydrothermal reaction for 16-20 h, then in an air atmosphere, annealing for 3-5 h.

9. The carbon fiber fan blade material for a drone of claim 8, wherein, In step 1), the concentration of the concentrated nitric acid is 68-72 wt%. The rotating speed of the continuous stirring is 150-200 r / min.

10. The carbon fiber fan blade material for a drone of claim 8, wherein, In step 2), the amount ratio of the nickel nitrate, cobalt nitrate, urea, deionized water, acidified carbon fiber and toluene is (3-5) g:(6-10) g:(7-12) g:(60-100) mL:(2-4) g:(200-300) mL; The temperature of the hydrothermal reaction is 110-116℃. The temperature of the annealing treatment is 350-370℃.

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