A tray based on waste old wind power blade recycled material and a preparation method thereof

Abstract

The application discloses a tray based on waste wind power blade regenerated material and a preparation method thereof. The preparation of the tray is divided into four processes, and the component mass percentage of the used materials is as follows: blade powder: 50%-70%; biodegradable resin: 20%-35%; reinforcing fiber: 5%-15%; compatibilizer: 2%-5%; processing aid: 1%-3%; wherein the blade powder is obtained after cleaning, crushing and drying pretreatment of waste wind power blades. The tray prepared by the component scheme has high static load strength, good water resistance and biodegradability, and has simple preparation process and low cost, and solves the problem of solid waste pollution.

Description

Technical Field

[0001] This application relates to the field of environmentally friendly material manufacturing technology, and in particular to a tray based on recycled waste wind turbine blades and its preparation method. Background Technology

[0002] Wind turbine blades are the core components of wind turbine generators. Their materials are primarily glass fiber, carbon fiber, and novel basalt fiber, supplemented by epoxy resin, balsa wood, and other materials. Wind turbine blades, made from a composite of multiple materials, possess characteristics such as corrosion resistance, resistance to extreme weather conditions (high and low temperatures), impact resistance, good toughness, fatigue resistance, lightweight, and long service life. However, directly discarding or abandoning these blades after they reach the end of their service life would result in significant resource waste and environmental pollution. In today's climate of strong environmental protection initiatives, how to recycle and utilize used wind turbine blades is a topic worthy of research.

[0003] Currently, wind turbine blade recycling mainly focuses on: high-temperature pyrolysis, chemical degradation, mechanical crushing and sorting, and high-value utilization of materials. High-temperature pyrolysis and chemical degradation are both methods involving chemical reactions, resulting in both recyclable and polluting waste. High-value utilization technologies also involve pyrolysis and sol-gel processes, which can also have environmental drawbacks. Mechanical crushing and sorting, on the other hand, is a physical method that does not damage the blade's constituent materials, has a high recycling rate, and causes relatively fewer environmental problems. Furthermore, directly using retired wind turbine blades to make pallets is both economical and environmentally friendly. Among the published patents, patent CN116694098A describes a method for mixing powders A and B from waste wind turbine blades with polypropylene, high-density polyethylene, treatment agents, antioxidants, compatibilizers, coupling agents, etc., to manufacture glass-plastic pallets. Patent CN118596436A mentions a method for preparing cargo pallets and the formulation of raw materials using glass fiber and fiberglass separated from waste wind turbine blades and thermoplastic substrates through hot extrusion and molding processes. In addition, the production of pallets using waste wind turbine blades also includes: directly cutting wind turbine blades into parts of specific shapes and then assembling them into pallets, or first building a pallet frame with waste wind turbine blade components, then laying waste wind turbine blade powder and scraps in a hot press mold, and finally forming it by hot pressing or other methods.

[0004] In summary, most current methods only partially utilize recycled fibers from wind turbine blades, failing to fully recycle and reuse all materials, thus still causing secondary solid waste pollution. While there are methods to directly utilize retired wind turbine blades to make pallets, these are simple processing techniques with limited applicability, and the resulting pallets do not perform well. To better recycle and utilize the materials from waste wind turbine blades to create high-performance pallets, and to comprehensively solve the solid waste pollution problem, new technological breakthroughs are needed that can fully recover and combine the various raw materials from waste wind turbine blades. Summary of the Invention

[0005] The embodiments of this application provide a tray based on recycled waste wind turbine blades and a method for preparing the same.

[0006] In a first aspect, embodiments of this application provide a tray based on recycled waste wind turbine blades, comprising the following components by weight percentage: Leaf powder: 50%-70%; Biodegradable resin: 20%-35%; Reinforcing fiber: 5%-15%; Compatibilizer: 2%-5%; Processing aids: 1%-3%; The blade powder is obtained by pre-treating waste wind turbine blades through cleaning, crushing and drying.

[0007] In one embodiment, the biodegradable resin is at least one of polylactic acid, polybutylene adipate terephthalate, and polybutylene succinate.

[0008] In one embodiment, the reinforcing fiber is at least one of glass fiber, carbon fiber, and basalt fiber, and the length of the reinforcing fiber is 2-5 mm.

[0009] In one embodiment, the compatibilizer is at least one of maleic anhydride-grafted polyethylene, ethylene-vinyl acetate copolymer, and polypropylene-grafted maleic anhydride.

[0010] In one embodiment, the processing aid is at least one of a lubricant, an antioxidant, and talc; wherein the lubricant is zinc stearate, and the antioxidant is antioxidant 1010.

[0011] In one embodiment, the particle size of the leaf powder is 80-120 mesh.

[0012] Secondly, embodiments of this application provide a method for manufacturing a tray based on recycled waste wind turbine blades as described in the first aspect, comprising: Weigh the blade powder, biodegradable resin, reinforcing fiber, compatibilizer, and processing aid according to the mass percentages described in the first aspect; wherein, the blade powder is 80-120 mesh powder obtained from waste wind turbine blades after cleaning, crushing, and drying pretreatment. Weigh the leaf powder, biodegradable resin and reinforcing fiber into a high-speed mixer and mix them evenly at 80-120℃ to obtain a premix. Add compatibilizers and processing aids to the premix and mix until the material is homogeneous to obtain the mixed raw material; The mixed raw materials are pressed into shape through a hot pressing process, and after cooling and cutting, a tray is obtained. The temperature during the hot pressing process is 160-200℃ and the pressure is 5-15MPa. The static load strength of the tray is ≥5000N, the water absorption rate is ≤8%, and the degradation rate in the natural environment is ≥30% after 6 months.

[0013] In one embodiment, the drying conditions during the pretreatment to obtain the leaf powder are: drying at 78-82°C with forced air for 3.5-4.5 hours, or drying at 55-65°C under a vacuum of 0.095MPa for 2.5-3.5 hours, or drying with hot air at 65-75°C for 4-6 hours, and the moisture content of the leaf powder obtained after drying is ≤1%.

[0014] In one embodiment, the stirring speed of the high-speed mixer is 800-1200 r / min, the mixing time of the leaf powder, biodegradable resin and reinforcing fiber in the high-speed mixer is 15-25 minutes, and the mixing time after adding compatibilizer and processing aid to the premix is ​​10-15 minutes.

[0015] In one embodiment, the hot pressing process for the mixed raw materials takes 20-30 minutes.

[0016] This application has the following advantages over the prior art: This application realizes the high-value utilization of waste wind turbine blades, comprehensively solves the solid waste pollution problem of waste wind turbine blades, and the pallets made have the characteristics of high load-bearing strength, good water resistance, and complete biodegradability. The production process is simple and the cost is low, which significantly reduces the environmental burden. The pallets made are suitable for use in logistics transportation, warehousing and other fields. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic flowchart illustrating the method for preparing a tray based on recycled waste wind turbine blades according to an embodiment of this application. Detailed Implementation

[0019] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0020] Embodiments of this application provide a tray based on recycled waste wind turbine blades, comprising the following components by weight percentage: Leaf powder: 50%-70%; Biodegradable resin: 20%-35%; Reinforcing fiber: 5%-15%; Compatibilizer: 2%-5%; Processing aids: 1%-3%; The blade powder is obtained by pre-treating waste wind turbine blades through cleaning, crushing and drying.

[0021] Specifically, the blade powder is the main filler of the tray, and the short-cut glass fiber / carbon fiber retained in the blade powder is the main reinforcement, providing extremely high rigidity and creep resistance, which determines the static load strength of the tray.

[0022] Biodegradable resin is hydrophobic and coats the surface of reinforcing fibers and leaf powder to form a barrier layer. It can also transfer and disperse stress, fix the position of reinforcing fibers, and is the main biodegradable component. It will gradually hydrolyze, enzymatically degrade, and ferment in environments such as soil / compost.

[0023] The reinforcing fiber is a secondary reinforcement that works synergistically with the fiber in the leaf powder to further enhance the overall strength of the tray. The reinforcing fiber also has a certain degree of flexibility, which can absorb impact energy and prevent the tray from suddenly breaking. In addition, the cellulose component in the reinforcing fiber is biodegradable, which helps to improve the overall degradation rate of the tray.

[0024] Compatibilizers are used to improve interfacial adhesion. Specifically, one end of their molecules is compatible with biodegradable resins, while the other end combines with the surface of reinforcing fibers through chemical reactions or physical entanglement. This greatly enhances the interfacial shear strength and provides a good sealing effect, preventing moisture from penetrating along the interface and reducing water absorption.

[0025] The pallet based on recycled waste wind turbine blades provided in this embodiment combines reinforcing fibers and biodegradable resin, which can enhance the static load strength of the pallet. The combination of biodegradable resin and compatibilizer can reduce the water absorption rate of the pallet, thereby improving the water resistance of the pallet. The combination of biodegradable resin and reinforcing fibers can make the pallet biodegradable under certain conditions. However, the thermosetting components such as epoxy resin in the blade powder are difficult to degrade, which can slow down the overall degradation rate and ensure the stability of the pallet during its service life.

[0026] The blade powder is obtained by cleaning, crushing and drying pretreatment of waste wind turbine blades, and the particle size of the blade powder is 80-120 mesh.

[0027] The biodegradable resin is selected from at least one of polylactic acid (PLA), polybutylene adipate terephthalate (PBAT), and polybutylene succinate (PBS).

[0028] The reinforcing fiber is made of at least one of glass fiber, carbon fiber, and basalt fiber, and the length of the reinforcing fiber is 2-5 mm.

[0029] The compatibilizer is at least one of maleic anhydride-grafted polyethylene, ethylene-vinyl acetate copolymer (EVA), and polypropylene-grafted maleic anhydride.

[0030] The processing aid is at least one of lubricant, antioxidant and talc; the lubricant is zinc stearate and the antioxidant is antioxidant 1010.

[0031] like Figure 1 As shown, this application also discloses a method for manufacturing a tray based on recycled waste wind turbine blades according to the above embodiments, including: S110. According to the embodiment, the blade powder, biodegradable resin, reinforcing fiber, compatibilizer, and processing aid are weighed based on the mass percentage of the recycled material in the tray of waste wind turbine blades; wherein, the blade powder is 80-120 mesh powder obtained by pre-treatment of waste wind turbine blades after cleaning, crushing and drying.

[0032] Specifically, the preparation of blade powder involves the following steps: Cleaning: After removing metal connectors and surface stains from waste wind turbine blades, they are placed in an industrial cleaning tank and rinsed several times with hot water at 60-80℃ to remove surface oil, mud, and soluble impurities. Subsequently, a high-speed dewatering machine is used to initially remove surface moisture, followed by natural air drying. Crushing: The cleaned material is fed into a jaw crusher for coarse crushing to 5-20cm blocks, then processed by a universal pulverizer and graded by a vibrating screen to collect powder with a particle size of 80-120 mesh. Drying: The sieved powder is sent to a drying oven for drying to reduce the moisture content to ≤0.5%, and then stored in a moisture-proof container for later use. The drying conditions are: 78-82℃ forced-air drying for 3.5-4.5 hours, or drying under 0.095MPa vacuum at 55-65℃ for 2.5-3.5 hours, or hot air drying at 65-75℃ for 4-6 hours. The moisture content of the resulting blade powder is ≤1%. The drying ovens corresponding to different drying conditions are the blower drying oven, the vacuum drying oven, and the hot air circulating drying oven.

[0033] S120. The weighed blade powder, biodegradable resin, and reinforcing fiber are added to a high-speed mixer and mixed evenly at 80-120℃ to obtain a premix. The stirring speed of the high-speed mixer is 800-1200 r / min, and the mixing time of the blade powder, biodegradable resin, and reinforcing fiber in the high-speed mixer is 15-25 minutes.

[0034] S130. Add compatibilizer and processing aid to the premix and mix until the material is homogeneous to obtain the mixed raw material. The stirring speed of the high-speed mixer is 800-1200 r / min, and the mixing time after adding compatibilizer and processing aid to the premix is ​​10-15 minutes.

[0035] S140. The mixed raw materials are pressed into shape by hot pressing process, and after cooling and cutting, a tray is obtained. The temperature during the hot pressing process is 160-200℃ and the pressure is 5-15MPa. The static load strength of the tray is ≥5000N, the water absorption rate is ≤8%, and the degradation rate in the natural environment is ≥30% after 6 months.

[0036] Specifically, the mixed raw materials are poured into a pallet mold and pressed using a thermoforming machine. The thermoforming machine is set to a temperature of 160-200℃, a pressure of 5-15MPa, and a pressing time of 20-30 minutes. After thermoforming, the pallet is demolded after cooling to room temperature and then trimmed to remove burrs, resulting in the finished pallet. Understandably, the dimensions of the pallet mold can be set according to actual needs, for example: 1200mm × 1000mm × 150mm.

[0037] The finished pallet prepared by the above method has a static load strength ≥5000N, a water absorption rate ≤8%, and a degradation rate ≥30% in the natural environment after 6 months.

[0038] The pallet and its preparation method based on recycled waste wind turbine blades provided in this application embodiment use waste wind turbine blades as the main raw material for pallet making. The blade powder obtained from waste wind turbine blades is combined with biodegradable resin, reinforcing fibers and compatibilizer. In the preparation process, the blade powder, biodegradable resin and reinforcing fibers are premixed first, and then the compatibilizer and processing aids are added, instead of mixing all raw materials at the same time. This makes the prepared pallet have high strength, low water absorption and certain biodegradability. Moreover, the preparation process is simple and low cost, and it can also reduce the environmental burden. The pallet made is suitable for use in logistics transportation, warehousing and other fields.

[0039] Example 1 Preparation of blade powder: After removing metal connectors and surface stains from waste wind turbine blades, rinse them three times with clean water and air dry them naturally; use a jaw crusher to initially crush them into 5cm blocks, and then use a universal pulverizer to pulverize them into 80-mesh powder; place the powder in a forced-air drying oven and dry it at 80℃ for 4 hours to remove moisture until the moisture content is ≤1%, thus obtaining blade powder.

[0040] Weigh the following by weight percentage: leaf powder: 50%, polylactic acid (PLA): 35%, glass fiber (3mm in length): 10%, maleic anhydride grafted polyethylene: 3%, lubricant (zinc stearate): 1%, antioxidant 1010: 1%.

[0041] The leaf powder, PLA and glass fiber are put into a high-speed mixer, the temperature is set to 80℃ and the speed is 800r / min, and the mixture is stirred for 15 minutes to obtain a premix.

[0042] Add maleic anhydride-grafted polyethylene, zinc stearate, and antioxidant 1010 to the premix, and continue stirring and mixing for 10 minutes until the material is homogeneous to obtain the mixed raw material.

[0043] After injecting the mixed raw materials into the mold, set the hot pressing parameters as follows: temperature 160℃, pressure 5MPa, hot pressing for 30 minutes; after cooling to room temperature, demold and trim the burrs to obtain the finished tray.

[0044] The pallet obtained in this embodiment has a static load strength ≥5000N (no deformation after 24 hours), a water absorption rate ≤8% (after soaking for 24 hours), and a degradation rate ≥30% in the natural environment for 6 months.

[0045] Example 2 Preparation of blade powder: After removing metal connectors and surface stains from waste wind turbine blades, rinse them three times with clean water and air dry them naturally; use a jaw crusher to initially crush them into 10cm blocks, and then use a universal pulverizer to pulverize them into 100-mesh powder; place the powder in a vacuum drying oven and vacuum dry it at 60℃ for 3 hours to remove moisture until the moisture content is ≤0.8%, thus obtaining blade powder.

[0046] Weigh the following by weight percentage: blade powder: 60%, polybutylene adipate terephthalate (PBAT): 30%, carbon fiber (2mm in length): 5%, ethylene-vinyl acetate copolymer (EVA): 4%, talc: 1%.

[0047] The blade powder, PBAT and carbon fiber were put into a high-speed mixer, the temperature was set to 100℃ and the speed to 1000r / min, and the mixture was stirred for 20 minutes to obtain a premix.

[0048] Add EVA and talc to the premix and continue stirring for 15 minutes until the material is homogeneous to obtain the mixed raw material.

[0049] After injecting the mixed raw materials into the mold, set the hot pressing parameters as follows: temperature 180℃, pressure 10MPa, hot pressing for 25 minutes; after cooling to room temperature, demold and trim the burrs to obtain the finished tray.

[0050] The pallet obtained in this embodiment has a static load strength ≥6000N (no deformation after 24 hours), a water absorption rate ≤6% (after soaking for 24 hours), and a degradation rate ≥35% in the natural environment after 6 months.

[0051] Example 3 Preparation of blade powder: After removing metal connectors and surface stains from waste wind turbine blades, rinse them three times with clean water and air dry them naturally; use a jaw crusher to initially crush them into 20cm blocks, and then use a universal pulverizer to pulverize them into 120-mesh powder; place the powder in a hot air circulating drying oven and dry it with hot air at 70℃ for 5 hours to remove moisture until the moisture content is ≤0.5%, thus obtaining blade powder.

[0052] Weigh the following by weight percentage: leaf powder: 70%, polybutylene succinate (PBS): 20%, basalt fiber (5mm in length): 5%, polypropylene grafted maleic anhydride: 2%, calcium stearate: 3%.

[0053] Leaf powder, PBS and basalt fiber were put into a high-speed mixer, the temperature was set to 120℃ and the speed to 1200r / min, and the mixture was stirred for 25 minutes to obtain a premix.

[0054] Add polypropylene grafted maleic anhydride and calcium stearate to the premix, and continue stirring and mixing for 15 minutes until the material is homogeneous to obtain the mixed raw material.

[0055] After injecting the mixed raw materials into the mold, set the hot pressing parameters as follows: temperature 200℃, pressure 15MPa, hot pressing for 20 minutes; after cooling to room temperature, demold and trim the burrs to obtain the finished tray.

[0056] The pallet obtained in this embodiment has a static load strength ≥7000N (no deformation after 24 hours), a water absorption rate ≤5% (after soaking for 24 hours), and a degradation rate ≥35% in the natural environment after 6 months.

[0057] Example 4 Preparation of blade powder: After removing metal connectors and surface stains from waste wind turbine blades, rinse them three times with clean water and air dry them naturally; use a jaw crusher to initially crush them into 20cm blocks, and then use a universal pulverizer to pulverize them into 120-mesh powder; place the powder in a hot air circulating drying oven and dry it with hot air at 70℃ for 5 hours to remove moisture until the moisture content is ≤0.5%, thus obtaining blade powder.

[0058] Weigh the following by weight percentage: leaf powder: 55%, polybutylene succinate (PBS): 25%, basalt fiber (5mm in length): 15%, polypropylene grafted maleic anhydride: 3%, calcium stearate: 2%.

[0059] Leaf powder, PBS and basalt fiber were put into a high-speed mixer, the temperature was set to 120℃ and the speed to 1200r / min, and the mixture was stirred for 25 minutes to obtain a premix.

[0060] Add polypropylene grafted maleic anhydride and calcium stearate to the premix, and continue stirring and mixing for 15 minutes until the material is homogeneous to obtain the mixed raw material.

[0061] After injecting the mixed raw materials into the mold, set the hot pressing parameters as follows: temperature 200℃, pressure 15MPa, hot pressing for 20 minutes; after cooling to room temperature, demold and trim the burrs to obtain the finished tray.

[0062] The pallet obtained in this embodiment has a static load strength ≥7000N (no deformation after 24 hours), a water absorption rate ≤5% (after soaking for 24 hours), and a degradation rate ≥35% in the natural environment after 6 months.

[0063] Comparative Example 1 Weigh the following by weight percentage: ordinary wood flour: 50%, polylactic acid (PLA): 35%, glass fiber (3mm in length): 10%, maleic anhydride grafted polyethylene: 3%, lubricant (zinc stearate): 1%, antioxidant 1010: 1%.

[0064] The leaf powder, PLA and glass fiber are put into a high-speed mixer, the temperature is set to 80℃ and the speed is 800r / min, and the mixture is stirred for 15 minutes to obtain a premix.

[0065] Add maleic anhydride-grafted polyethylene, zinc stearate, and antioxidant 1010 to the premix, and continue stirring and mixing for 10 minutes until the material is homogeneous to obtain the mixed raw material.

[0066] After injecting the mixed raw materials into the mold, set the hot pressing parameters as follows: temperature 160℃, pressure 5MPa, hot pressing for 30 minutes; after cooling to room temperature, demold and trim the burrs to obtain the finished tray.

[0067] The pallet obtained in this comparative example has a static load strength of approximately 4000N (no deformation after 24 hours), a water absorption rate of 10%-15% (after 24 hours of soaking), and a degradation rate of 40% in the natural environment after 6 months.

[0068] Comparative Example 1 shows that when the leaf powder is replaced with ordinary wood powder, the tray prepared by the preparation method provided in this application has lower static load strength, higher water absorption rate (i.e., lower water resistance), and higher natural degradation rate compared to the tray prepared in Example 1.

[0069] Comparative Example 2 Weigh the following by weight percentage: leaf powder: 50%, polylactic acid (PLA): 35%, glass fiber (3mm in length): 10%, maleic anhydride grafted polyethylene: 3%, lubricant (zinc stearate): 1%, antioxidant 1010: 1%.

[0070] Leaf powder, PLA and glass fiber, maleic anhydride-grafted polyethylene, zinc stearate, and antioxidant 1010 are put into a high-speed mixer. The temperature is set to 80℃ and the speed is set to 800r / min. The mixture is stirred until the material is homogeneous to obtain the mixed raw material.

[0071] After injecting the mixed raw materials into the mold, set the hot pressing parameters as follows: temperature 160℃, pressure 5MPa, hot pressing for 30 minutes; after cooling to room temperature, demold and trim the burrs to obtain the finished tray.

[0072] The pallet obtained in this embodiment has a static load strength of 4000N (no deformation after 24 hours), a water absorption rate of 10% (after soaking for 24 hours), and a degradation rate of ≥30% in the natural environment for 6 months.

[0073] Comparative Example 2 shows that when materials are uniformly added to a mixer, compared to the high-temperature premixing of leaf powder and reinforcing fiber before adding other raw materials in Example 1 of this application, the static load strength of the resulting tray is significantly reduced, the water absorption rate is increased (i.e., the water resistance is reduced), and the natural degradation rate is not significantly affected.

[0074] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A tray based on recycled waste wind turbine blades, characterized in that, Includes the following components by mass percentage: Leaf powder: 50%-70%; Biodegradable resin: 20%-35%; Reinforcing fiber: 5%-15%; Compatibilizer: 2%-5%; Processing aids: 1%-3%; The blade powder is obtained by pre-treating waste wind turbine blades through cleaning, crushing and drying.

2. The tray based on recycled waste wind turbine blades according to claim 1, characterized in that, The biodegradable resin is at least one of polylactic acid, polybutylene adipate-terephthalate, and polybutylene succinate.

3. The tray based on recycled waste wind turbine blades according to claim 1, characterized in that, The reinforcing fiber is at least one of glass fiber, carbon fiber, and basalt fiber, and the length of the reinforcing fiber is 2-5 mm.

4. The tray based on recycled waste wind turbine blades according to claim 1, characterized in that, The compatibilizer is at least one of maleic anhydride-grafted polyethylene, ethylene-vinyl acetate copolymer, and polypropylene-grafted maleic anhydride.

5. The tray based on recycled waste wind turbine blades according to claim 1, characterized in that, The processing aid is at least one of a lubricant, an antioxidant, and talc; wherein the lubricant is zinc stearate, and the antioxidant is antioxidant 1010.

6. The tray based on recycled waste wind turbine blades according to claim 1, characterized in that, The particle size of the blade powder is 80-120 mesh.

7. A method for manufacturing a tray based on recycled waste wind turbine blades as described in any one of claims 1-6, characterized in that, include: Weigh the blade powder, biodegradable resin, reinforcing fiber, compatibilizer, and processing aid according to the mass percentages described in claim 1; wherein the blade powder is 80-120 mesh powder obtained from waste wind turbine blades after cleaning, crushing, and drying pretreatment. The weighed leaf powder, the biodegradable resin and the reinforcing fiber are put into a high-speed mixer and mixed evenly at 80-120°C to obtain a premix. The compatibilizer and the processing aid are added to the premix and mixed until the material is homogeneous to obtain a mixed raw material. The mixed raw materials are pressed into shape by hot pressing, and after cooling and cutting, a tray is obtained. The temperature during the hot pressing process is 160-200℃ and the pressure is 5-15MPa. The static load strength of the tray is ≥5000N, the water absorption rate is ≤8%, and the degradation rate in the natural environment is ≥30% after 6 months.

8. The method for manufacturing a tray based on recycled waste wind turbine blades according to claim 7, characterized in that, The drying conditions during the pretreatment to obtain the leaf powder are: drying at 78-82℃ with forced air for 3.5-4.5 hours, or drying at 55-65℃ under 0.095MPa vacuum for 2.5-3.5 hours, or drying with hot air at 65-75℃ for 4-6 hours. The moisture content of the leaf powder obtained after drying is ≤1%.

9. The method for manufacturing a tray based on recycled waste wind turbine blades according to claim 7, characterized in that, The stirring speed of the high-speed mixer is 800-1200 r / min, the mixing time of the leaf powder, the biodegradable resin and the reinforcing fiber in the high-speed mixer is 15-25 minutes, and the mixing time of the premix after adding the compatibilizer and the processing aid is 10-15 minutes.

10. The method for manufacturing a tray based on recycled waste wind turbine blades according to claim 7, characterized in that, The hot pressing molding process for the mixed raw materials takes 20-30 minutes.

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