A high-performance composite plate prepared from waste wind power blades and a preparation method thereof

Abstract

The present disclosure relates to a high-performance composite board prepared from waste wind power blades and a preparation method thereof. The high-performance composite board contains a large amount of waste wind power blade powder and waste wind power blade degraded glass fiber. The preparation cost of the high-performance composite board can be reduced. The powder prepared from the waste wind power blades and the regenerated glass fiber obtained by the chemical degradation method can be recycled and reused. The resource utilization of the retired wind power blades is realized. The problem of resource utilization of the retired wind power blades is effectively solved. In addition, the coupling effect of the waste wind power blade powder and the waste wind power blade degraded glass fiber with the thermoplastic resin is good. Under the synergistic action of the compatibilizer, wood powder, filler and lubricant and other materials, the mixing and stirring effect can be improved. The waste wind power blade powder and the waste wind power blade degraded glass fiber can be uniformly dispersed in the high-performance composite board. The physical properties of the composite board, such as tensile resistance, bending resistance and compression resistance, can be improved.

Description

Technical Field

[0001] This disclosure relates to the field of solid waste treatment technology, specifically to a high-performance composite material prepared from waste wind turbine blades and its preparation method. Background Technology

[0002] Wind turbine blades are one of the core components of wind turbine generators. Currently, most wind turbine blades in service are made of fiber-reinforced thermosetting resin-based composite materials. This material has many advantages, such as high specific strength, high fatigue resistance, good corrosion resistance, and good weather resistance, and its service life is generally 20-25 years. Wind turbine blades are chemically extremely stable and can remain uncorroded for decades or even centuries. As time goes by, early installed wind turbine generators will be gradually decommissioned, resulting in a large number of decommissioned wind turbine blades.

[0003] Currently, a considerable number of research institutions and enterprises have conducted relevant research on the resource utilization of retired wind turbine blades. The mainstream treatment methods in the market are physical treatment and chemical degradation. Physical treatment involves cutting and crushing waste wind turbine blades and using them as fillers to produce some wood-plastic composite recycled boards. However, their performance is only on par with or slightly weaker than traditional wood-plastic materials, resulting in poor market competitiveness. Chemical degradation is relatively expensive, and the recycled glass fiber cannot be reused to manufacture blades. Its downstream applications are yet to be developed. Summary of the Invention

[0004] The purpose of this disclosure is to provide a high-performance composite board made from waste wind turbine blades and its preparation method, in order to solve the problems in the prior art where the degraded glass fiber cannot be reused and the boards made from waste wind turbine blade powder have poor market competitiveness.

[0005] To achieve the above objectives, the first aspect of this disclosure provides a high-performance composite material prepared from waste wind turbine blades. The materials used to prepare the high-performance composite material include waste wind turbine blade material, silane coupling agent, thermoplastic resin, compatibilizer, wood flour, filler, lubricant, release agent, and pigment; wherein the waste wind turbine blade material includes waste wind turbine blade powder and degraded glass fiber from waste wind turbine blades.

[0006] Relative to 160 parts by weight of the thermoplastic resin, the content of the waste wind turbine blade powder is 50-200 parts by weight, the content of the waste wind turbine blade degraded glass fiber is 5-40 parts by weight, the content of the silane coupling agent is 5-50 parts by weight, the content of the compatibilizer is 5-80 parts by weight, the content of the wood flour is 50-200 parts by weight, the content of the filler is 5-50 parts by weight, the content of the lubricant is 5-35 parts by weight, the content of the release agent is 5-35 parts by weight, and the content of the pigment is 1-10 parts by weight.

[0007] Optionally, the silane coupling agent includes KH550 and / or KH560.

[0008] Optionally, the particle size of the waste wind turbine blade powder is 40-200 mesh; the length of the degraded glass fiber in the waste wind turbine blade is 0.5-3 cm.

[0009] Optionally, relative to 160 parts by weight of the thermoplastic resin, the content of the waste wind turbine blade powder is 100-180 parts by weight, the content of the waste wind turbine blade degraded glass fiber is 10-30 parts by weight, the content of the silane coupling agent is 10-45 parts by weight, the content of the compatibilizer is 10-70 parts by weight, the content of the wood flour is 100-180 parts by weight, the content of the filler is 10-40 parts by weight, the content of the lubricant is 10-30 parts by weight, the content of the release agent is 10-30 parts by weight, and the content of the pigment is 2-8 parts by weight.

[0010] Optionally, the thermoplastic resin includes polypropylene and / or polyethylene; the wood flour includes poplar flour and / or eucalyptus flour; the particle size of the wood flour is 50-150 mesh; the compatibilizer includes maleic anhydride-grafted polypropylene and / or maleic anhydride-grafted polyethylene; the filler includes calcium carbonate and / or talc; the lubricant includes polyethylene wax; the release agent includes one or more of sodium stearate, magnesium stearate, and calcium stearate; and the pigment includes iron oxide red and / or iron oxide yellow.

[0011] A second aspect of this disclosure provides a method for preparing the high-performance composite material described in the first aspect, the method comprising:

[0012] S1. The waste wind turbine blade material and the silane coupling agent dilution solution are fed into a high-speed mixer for premixing treatment; the waste wind turbine blade material includes waste wind turbine blade powder and waste wind turbine blade degraded glass fiber.

[0013] S2. The thermoplastic resin, compatibilizer, wood flour, filler, lubricant, release agent and pigment are fed into the high-speed mixer and mixed with the mixture in step S1 to obtain composite board mixture;

[0014] S3. The composite board mixture is fed into a granulator for granulation to obtain composite resin particles.

[0015] S4. The composite resin particles are fed into a conical twin-screw extruder for extrusion molding to obtain a high-performance composite board.

[0016] The composite board mixture comprises, relative to 160 parts by weight of the thermoplastic resin, 50-200 parts by weight of the waste wind turbine blade powder, 5-40 parts by weight of the waste wind turbine blade degraded glass fiber, 5-50 parts by weight of the silane coupling agent, 5-80 parts by weight of the compatibilizer, 50-200 parts by weight of the wood flour, 5-50 parts by weight of the filler, 5-35 parts by weight of the lubricant, 5-35 parts by weight of the release agent, and 1-10 parts by weight of the pigment.

[0017] Optionally, step S1 includes:

[0018] S11. The waste wind turbine blades are sequentially cut, crushed and sieved to obtain the waste wind turbine blade powder with a particle size of 40-200 mesh.

[0019] S12. The waste wind turbine blades are sequentially cut, chemically degraded, washed, dried and segmented to obtain the degraded glass fiber of the waste wind turbine blades with a length of 0.5-3cm.

[0020] S13. The waste wind turbine blade powder and the waste wind turbine blade degraded glass fiber are fed into the high-speed mixer for stirring, and the silane coupling agent dilution is sprayed in during the stirring process.

[0021] S14. Continue stirring in the high-speed mixer for 10-30 minutes at a speed of 550-650 r / min;

[0022] S15. Cool the mixture obtained in step S14 to 20-30℃.

[0023] Optionally, the mass concentration of the silane coupling agent in the silane coupling agent diluent is 30-60%.

[0024] Optionally, step S3 further includes the following conditions for the granulation process: the temperature of the feeding section in the granulator is 160-210℃, the temperature of the plasticizing section in the granulator is 150-190℃, and the temperature of the extrusion section in the granulator is 140-180℃.

[0025] Optionally, step S4 further includes the following conditions for extrusion molding: the temperature of the feeding section in the conical twin-screw extruder is 170-220℃, the temperature of the plasticizing section in the conical twin-screw extruder is 150-200℃, and the temperature of the extrusion section in the conical twin-screw extruder is 140-180℃.

[0026] Through the above technical solution, the high-performance composite board prepared in this disclosure contains a large amount of waste wind turbine blade powder and degraded glass fiber from waste wind turbine blades. This not only reduces the manufacturing cost of the high-performance composite board but also enables the recycling and reuse of powder made from waste wind turbine blades and recycled glass fiber obtained through chemical degradation, realizing the resource utilization of retired wind turbine blades and effectively solving the problem of resource utilization of retired wind turbine blades. In addition, the coupling effect between waste wind turbine blade powder and degraded glass fiber from waste wind turbine blades and thermoplastic resin is good. Furthermore, under the synergistic effect of compatibilizers, wood flour, fillers, and lubricants, the mixing effect can be improved, allowing the waste wind turbine blade powder and degraded glass fiber from waste wind turbine blades to be uniformly dispersed in the high-performance composite board, thereby improving the tensile, bending, and compressive physical properties of the composite board.

[0027] Other features and advantages of this disclosure will be described in detail in the following detailed description section. Detailed Implementation

[0028] The following provides a detailed description of specific embodiments of this disclosure. It should be understood that the specific embodiments described herein are for illustrative and explanatory purposes only and are not intended to limit this disclosure.

[0029] The first aspect of this disclosure provides a high-performance composite board prepared using waste wind turbine blades. The materials used to prepare the high-performance composite board include waste wind turbine blade material, a silane coupling agent, a thermoplastic resin, a compatibilizer, wood flour, a filler, a lubricant, a release agent, and a pigment. The waste wind turbine blade material comprises waste wind turbine blade powder and degraded glass fiber from waste wind turbine blades. Relative to 160 parts by weight of the thermoplastic resin, the content of the waste wind turbine blade powder is 50-200 parts by weight, the content of the degraded glass fiber from waste wind turbine blades is 5-40 parts by weight, the content of the silane coupling agent is 5-50 parts by weight, the content of the compatibilizer is 5-80 parts by weight, the content of the wood flour is 50-200 parts by weight, the content of the filler is 5-50 parts by weight, the content of the lubricant is 5-35 parts by weight, the content of the release agent is 5-35 parts by weight, and the content of the pigment is 1-10 parts by weight.

[0030] Through the above technical solution, the high-performance composite board prepared in this disclosure contains a large amount of waste wind turbine blade powder and degraded glass fiber from waste wind turbine blades. This not only reduces the manufacturing cost of the high-performance composite board but also enables the recycling and reuse of powder made from waste wind turbine blades and recycled glass fiber obtained through chemical degradation, achieving the goal of resource utilization of retired wind turbine blades. Furthermore, the waste wind turbine blade powder and degraded glass fiber exhibit good coupling effect with thermoplastic resin. Moreover, the synergistic effect of compatibilizers, wood flour, fillers, and lubricants enhances the mixing and stirring effect, allowing the waste wind turbine blade powder and degraded glass fiber to be uniformly dispersed in the high-performance composite board, thereby improving the tensile, bending, and compressive physical properties of the composite board.

[0031] In a preferred embodiment, relative to 160 parts by weight of the thermoplastic resin, the content of the waste wind turbine blade powder is 100-180 parts by weight, the content of the waste wind turbine blade degraded glass fiber is 10-30 parts by weight, the content of the silane coupling agent is 10-45 parts by weight, the content of the compatibilizer is 10-70 parts by weight, the content of the wood flour is 100-180 parts by weight, the content of the filler is 10-40 parts by weight, the content of the lubricant is 10-30 parts by weight, the content of the release agent is 10-30 parts by weight, and the content of the pigment is 2-8 parts by weight.

[0032] In a further preferred embodiment, relative to 160 parts by weight of the thermoplastic resin, the content of the waste wind turbine blade powder is 150-170 parts by weight, the content of the waste wind turbine blade degraded glass fiber is 15-25 parts by weight, the content of the silane coupling agent is 20-40 parts by weight, the content of the compatibilizer is 20-60 parts by weight, the content of the wood flour is 150-170 parts by weight, the content of the filler is 20-30 parts by weight, the content of the lubricant is 15-25 parts by weight, the content of the release agent is 15-25 parts by weight, and the content of the pigment is 3-6 parts by weight.

[0033] In one embodiment, by rationally proportioning the various components in the raw materials of the high-performance composite board, the mechanical properties of the high-performance composite board can be further enhanced. Specifically, the tensile strength of the composite board is above 20.5 MPa, the bending strength is above 48 MPa, and the compressive strength is above 52 MPa.

[0034] In one embodiment, the particle size of the waste wind turbine blade powder is 40-200 mesh.

[0035] In a preferred embodiment, the particle size of the waste wind turbine blade powder is 50-100 mesh.

[0036] In this embodiment, the waste wind turbine blade powder refers to waste wind turbine blades obtained by sequentially cutting, crushing, and sieving. Using waste wind turbine blade powder with an appropriate particle size can improve the uniformity of each component during the mixing process, thereby enhancing the tensile strength, flexural strength, and compressive strength of the high-performance composite material.

[0037] In one embodiment, the length of the degraded glass fiber in the waste wind turbine blade is 0.5-3 cm.

[0038] In a preferred embodiment, the length of the degraded glass fiber in the waste wind turbine blade is 1-2 cm.

[0039] In this embodiment, the degraded glass fiber from waste wind turbine blades refers to the waste wind turbine blades that have been sequentially cut, chemically degraded, washed, dried, and segmented. Using appropriately sized degraded glass fiber from waste wind turbine blades to prepare high-performance composite panels enables these panels to provide better tensile strength under tension, bending, and compression, thereby giving them higher tensile strength, bending strength, and compressive strength.

[0040] In one embodiment, the silane coupling agent described in this disclosure is a conventional choice in the art, and this application does not make any special requirements. For example, the silane coupling agent includes silane coupling agent KH550 and / or silane coupling agent KH560.

[0041] In this embodiment, by adding a silane coupling agent to the raw materials, the non-hydrolyzable organic functional group at one end of the silane coupling agent can bond with the thermoplastic resin, and the hydrolyzable group at the other end of the silane coupling agent can bond with the glass fibers exposed on the surface of the waste wind turbine blade powder and the degraded glass fibers of the waste wind turbine blades. This improves the grafting coupling effect between the waste wind turbine blade material and the thermoplastic resin, thereby enhancing the mechanical properties of the high-performance composite board. Vinyl silane coupling agents and methacryloxy silane coupling agents can further improve the bonding strength between these silane coupling agents and polyester or acrylic resins; epoxy silane coupling agents can improve the bonding strength between these silane coupling agents and epoxy resins.

[0042] In one embodiment, the thermoplastic resin used in this disclosure is a conventional choice in the art, and this application does not make any special requirements. For example, the thermoplastic resin includes polyethylene and / or polypropylene.

[0043] In one embodiment, the wood flour includes poplar wood flour and / or eucalyptus wood flour.

[0044] In one embodiment, the wood flour has a particle size of 50-150 mesh.

[0045] In a preferred embodiment, the wood flour has a particle size of 60-100 mesh.

[0046] In this embodiment, wood flour is used in the high-performance composite board of this disclosure. On the one hand, wood flour can act as a filler in the whole board and can be fully dispersed in it during the hot stirring process with thermoplastic resin to obtain a board with high hardness. On the other hand, the wood flour can be made from wood chips or scraps during wood processing, which can further reduce the production cost of the board.

[0047] In one embodiment, in order to further improve the mechanical properties of the high-performance composite board, a filler can be used in the high-performance composite board. The filler described in this disclosure includes calcium carbonate and / or talc.

[0048] In one embodiment, the compatibilizer used in this disclosure includes maleic anhydride-grafted polypropylene and / or maleic anhydride-grafted polyethylene.

[0049] In this embodiment, both maleic anhydride-grafted polypropylene and maleic anhydride-grafted polyethylene are formed by introducing highly polar side groups onto a non-polar molecular backbone. Maleic anhydride-grafted polypropylene or polyethylene can serve as a bridge to improve the adhesion and compatibility between polar and non-polar materials. Adding maleic anhydride-grafted polypropylene when filling polypropylene with wood flour and fillers can significantly improve the affinity between the filler and polypropylene, as well as the dispersibility of the filler. Therefore, it can effectively enhance the dispersion of the filler in polypropylene, thereby improving the tensile and impact strength of the filled polypropylene.

[0050] In one embodiment, the lubricant comprises one or more of polyethylene wax, stearic acid, methyl stearate, and decanoic acid amide, preferably polyethylene wax.

[0051] In this embodiment, by adding a lubricant to the high-performance composite sheet material, the softness and tensile properties of the material obtained after mixing and refining can be further improved, as well as the effect of melt extrusion treatment, resulting in a smooth surface of the prepared sheet. Polyethylene wax, in particular, has strong internal lubricating properties and weak external lubricating properties, which can reduce the friction between the high-performance composite sheet materials, reduce the difficulty of mixing, improve the uniformity of mixing of waste wind turbine blade materials within the thermoplastic resin, and thus enhance the mechanical properties of the high-performance composite sheet.

[0052] In one embodiment, the release agent includes one or more of sodium stearate, magnesium stearate, and calcium stearate.

[0053] In one embodiment, the pigment includes iron oxide red and / or iron oxide yellow.

[0054] A second aspect of this disclosure provides a method for preparing the high-performance composite material described in the first aspect, the method comprising:

[0055] S1. The waste wind turbine blade material and the silane coupling agent dilution solution are fed into a high-speed mixer for premixing treatment; the waste wind turbine blade material includes waste wind turbine blade powder and waste wind turbine blade degraded glass fiber.

[0056] S2. The thermoplastic resin, compatibilizer, wood flour, filler, lubricant, release agent and pigment are fed into the high-speed mixer and mixed with the mixture in step S1 to obtain composite board mixture;

[0057] S3. The composite board mixture is fed into a granulator for granulation to obtain composite resin particles.

[0058] S4. The composite resin particles are fed into a conical twin-screw extruder for extrusion molding to obtain a high-performance composite board.

[0059] The composite board mixture comprises, relative to 160 parts by weight of the thermoplastic resin, 50-200 parts by weight of the waste wind turbine blade powder, 5-40 parts by weight of the waste wind turbine blade degraded glass fiber, 5-50 parts by weight of the silane coupling agent, 5-80 parts by weight of the compatibilizer, 50-200 parts by weight of the wood flour, 5-50 parts by weight of the filler, 5-35 parts by weight of the lubricant, 5-35 parts by weight of the release agent, and 1-10 parts by weight of the pigment.

[0060] Through the above technical solution, this disclosure fully mixes waste wind turbine blade powder, degraded glass fiber from waste wind turbine blades, and silane coupling agent, and then mixes and refines them with thermoplastic resin, compatibilizer, wood flour, filler, release agent, and pigment to produce high-performance composite panels. On the one hand, it can reduce the manufacturing cost of high-performance composite panels and also recycle and reuse the powder made from waste wind turbine blades and the recycled glass fiber obtained by chemical degradation, realizing the resource utilization of retired wind turbine blades and effectively solving the problem of resource utilization of retired wind turbine blades. On the other hand, it can form a good synergistic effect among the various components, and obtain modified composite panels with good tensile, bending, and compressive mechanical properties.

[0061] In one embodiment, step S1 includes:

[0062] S11. The waste wind turbine blades are sequentially cut, crushed and sieved to obtain the waste wind turbine blade powder with a particle size of 40-200 mesh.

[0063] S12. The waste wind turbine blades are sequentially cut, chemically degraded, washed, dried and segmented to obtain the degraded glass fiber of the waste wind turbine blades with a length of 0.5-3cm.

[0064] S13. The waste wind turbine blade powder and the waste wind turbine blade degraded glass fiber are fed into the high-speed mixer for stirring, and the silane coupling agent dilution is sprayed in during the stirring process.

[0065] S14. Continue stirring in the high-speed mixer for 10-30 minutes at a speed of 550-650 r / min;

[0066] S15. Cool the mixture obtained in step S14 to 20-30℃.

[0067] In one embodiment, the waste wind turbine blades are cleaned before being cut. The cleaning process is a conventional method in the art and is not specifically required in this application.

[0068] In one embodiment, the chemical degradation in step S12 includes: placing the cut material obtained after cutting in an organic solvent containing an alkali, and reacting it for 280-310 min at a temperature of 160-175°C and a pressure of 0.9-1.1 MPa; wherein the alkali includes sodium hydroxide and / or magnesium hydroxide, and the organic solvent includes polyethylene glycol and / or polypropylene glycol.

[0069] In one embodiment, the washing process in step S12 includes: filtering the chemically degraded reaction material to obtain glass fiber filaments, immersing the glass fiber filaments in a sizing agent for at least 1 minute, and then filtering them to obtain the degraded glass fiber from the waste wind turbine blades. The sizing agent includes water.

[0070] In one embodiment, the drying process described in step S12 is a conventional method in the art, and this application does not make any special requirements, as long as it can remove the sizing agent from the degraded glass fiber of the waste wind turbine blades.

[0071] In one embodiment, the silane coupling agent diluent in step S13 is a mixture of silane coupling agent and ethanol. The ethanol is anhydrous ethanol.

[0072] In one embodiment, the mass concentration of the silane coupling agent in the silane coupling agent diluent is 30-60%.

[0073] In one embodiment, the conditions for the stirring process in step S13 include: the high-speed mixer operates at a speed of 550-650 r / min for a time of 10-30 min.

[0074] In one embodiment, the mixing conditions in step S2 include: the high-speed mixer operates at a speed of 550-650 r / min, preferably 600-620 r / min; and the mixing time is 30-60 min, preferably 40-50 min.

[0075] In one embodiment, the granulator described in step S3 is a conventional choice in the art, and this application does not make any special requirements.

[0076] In one embodiment, the conditions for the granulation process in step S3 include: the temperature of the feeding section in the granulator is 160-210°C, the temperature of the plasticizing section in the granulator is 150-190°C, and the temperature of the extrusion section in the granulator is 140-180°C.

[0077] In a preferred embodiment, the conditions for the granulation process in step S3 include: the temperature of the feeding section in the granulator is 190-200°C, the temperature of the plasticizing section in the granulator is 160-180°C, and the temperature of the extrusion section in the granulator is 150-170°C.

[0078] In one embodiment, the particle size of the composite resin particles in step S3 can be flexibly adjusted according to actual production needs, which will not be elaborated here. In this embodiment, mixing the composite board into particles of suitable size can improve the effect of subsequent extrusion molding, thereby improving the mechanical properties of the high-performance composite board.

[0079] In one embodiment, the conical twin-screw extruder described in step S4 is a conventional choice in the art, and this application does not make any special requirements.

[0080] In one embodiment, the extrusion molding conditions in step S4 include: the temperature of the feeding section of the conical twin-screw extruder is 170-220°C, the temperature of the plasticizing section of the conical twin-screw extruder is 150-200°C, and the temperature of the extrusion section of the conical twin-screw extruder is 140-180°C.

[0081] In a preferred embodiment, the extrusion molding conditions in step S4 include: the temperature of the feeding section of the conical twin-screw extruder is 180-200°C, the temperature of the plasticizing section of the conical twin-screw extruder is 160-180°C, and the temperature of the extrusion section of the conical twin-screw extruder is 150-170°C.

[0082] In one embodiment, step S4 further includes placing the material from the outlet of the conical twin-screw extruder into a mold for a high-performance composite material, and cooling it to room temperature to obtain the high-performance composite material.

[0083] In one embodiment, the method for preparing the high-performance composite material includes:

[0084] S11. The waste wind turbine blades are sequentially cut, crushed and sieved to obtain the waste wind turbine blade powder with a particle size of 40-200 mesh.

[0085] S12. The waste wind turbine blades are sequentially cut, chemically degraded, washed, dried and segmented to obtain the degraded glass fiber of the waste wind turbine blades with a length of 0.5-3cm.

[0086] S13. The waste wind turbine blade powder and the waste wind turbine blade degraded glass fiber are fed into the high-speed mixer for stirring, and the silane coupling agent dilution is sprayed in during the stirring process.

[0087] S14. Continue stirring in the high-speed mixer for 10-30 minutes at a speed of 550-650 r / min;

[0088] S15. Cool the mixture obtained in step S14 to 20-30°C;

[0089] S2. The thermoplastic resin, compatibilizer, wood flour, filler, lubricant, release agent and pigment are fed into the high-speed mixer and mixed with the mixture in step S1. The mixture is stirred in the high-speed mixer at a speed of 550-650 r / min for 30-60 min to obtain the composite board mixture.

[0090] The composite board mixture comprises, relative to 160 parts by weight of the thermoplastic resin, 50-200 parts by weight of the waste wind turbine blade powder, 5-40 parts by weight of the waste wind turbine blade degraded glass fiber, 5-50 parts by weight of the silane coupling agent, 5-80 parts by weight of the compatibilizer, 50-200 parts by weight of the wood flour, 5-50 parts by weight of the filler, 5-35 parts by weight of the lubricant, 5-35 parts by weight of the release agent, and 1-10 parts by weight of the pigment.

[0091] S3. The composite board mixture is fed into a granulator for granulation to obtain composite resin granules. The granulation conditions include: the temperature of the feeding section of the granulator is 160-210℃, the temperature of the plasticizing section of the granulator is 150-190℃, and the temperature of the extrusion section of the granulator is 140-180℃.

[0092] S4. The composite resin particles are fed into a conical twin-screw extruder for extrusion molding to obtain a high-performance composite board. The extrusion molding conditions include: the temperature of the feeding section of the conical twin-screw extruder is 170-220℃, the temperature of the plasticizing section of the conical twin-screw extruder is 150-200℃, and the temperature of the extrusion section of the conical twin-screw extruder is 140-180℃.

[0093] The present disclosure is further illustrated by the following examples, but the disclosure is not limited thereto. Unless otherwise specified, the compounds used in the following examples and comparative examples are all commercially available pharmaceutical reagents.

[0094] Example 1

[0095] The method for preparing the high-performance composite board includes:

[0096] S11. The waste wind turbine blades are sequentially cut, crushed and sieved to obtain waste wind turbine blade powder with a particle size of 40 mesh.

[0097] S12. The waste wind turbine blades are sequentially cut, chemically degraded, washed, dried and segmented to obtain waste wind turbine blade degraded glass fiber with a length of 0.5cm.

[0098] S13. 50 parts by weight of waste wind turbine blade powder and 5 parts by weight of waste wind turbine blade degraded glass fiber are fed into the high-speed mixer and stirred. During the stirring process, 5 parts by weight of silane coupling agent KH550 diluted solution (30% alcohol solution) is sprayed in.

[0099] S14. Continue stirring in the high-speed mixer for 20 minutes at a speed of 600 r / min;

[0100] S15. Cool the mixture obtained in step S14 to 25°C;

[0101] S2. 160 parts by weight of polypropylene, 5 parts by weight of maleic anhydride-grafted polypropylene, 200 parts by weight of 60-mesh poplar wood powder, 5 parts by weight of calcium carbonate, 5 parts by weight of polyethylene wax, 5 parts by weight of sodium stearate and 1 part by weight of iron oxide red are fed into the high-speed mixer and mixed with the mixture obtained in step S15. The mixture is stirred in the high-speed mixer at a speed of 600 r / min for 30 min to obtain the composite board mixture.

[0102] S3. The composite board mixture is fed into a granulator for granulation to obtain composite resin granules; the granulation conditions include: the temperature of the feeding section of the granulator is 160°C, the temperature of the plasticizing section of the granulator is 150°C, and the temperature of the extrusion section of the granulator is 140°C.

[0103] S4. The composite resin particles are fed into a conical twin-screw extruder for extrusion molding to obtain a high-performance composite sheet a with dimensions of 2m×12mm×20mm; the extrusion molding conditions include: the temperature of the feeding section of the conical twin-screw extruder is 170℃, the temperature of the plasticizing section of the conical twin-screw extruder is 150℃, and the temperature of the extrusion section of the conical twin-screw extruder is 140℃.

[0104] Example 2

[0105] The method for preparing the high-performance composite board is the same as in Example 1, except that: 200 parts by weight (200 mesh) of waste wind turbine blade powder and 40 parts by weight (3 cm) of degraded glass fiber from waste wind turbine blades are placed in a high-speed mixer and slowly stirred. 50 parts by weight (60% alcohol solution) of diluted silane coupling agent KH560 are sprayed on top. The speed is then increased to 600 r / min and stirring continues for 20 min, followed by cooling to room temperature. 160 parts by weight of polyethylene, 60 parts by weight of maleic anhydride-grafted polyethylene, 50 parts by weight of 100 mesh poplar powder, 50 parts by weight of talc, 35 parts by weight of polyethylene wax, 35 parts by weight of calcium stearate, and 10 parts by weight of iron oxide yellow are added. The speed is increased to 600 r / min and stirred for 60 min to obtain the composite board mixture. The composite board mixture is granulated using a granulator to obtain composite resin particles. The granulation temperature is set as follows: feeding section 210℃, plasticizing section 190℃, and extrusion section 180℃. Composite resin granules are placed into the hopper of a conical twin-screw extruder. The extruder operating temperature is set as follows: 220°C for the feeding section, 200°C for the plasticizing section, and 180°C for the extrusion section. High-performance composite board b is obtained by slow extrusion.

[0106] Example 3

[0107] The method for preparing the high-performance composite board is the same as in Example 1, except that: 150 parts by weight (100 mesh) of waste wind turbine blade powder and 20 parts by weight (1 cm) of degraded glass fiber from waste wind turbine blades are placed in a high-speed mixer and slowly stirred. 20 parts by weight (50% alcohol solution) of diluted silane coupling agent KH550 are sprayed on top. The speed is then increased to 600 r / min and stirring continues for 20 min, followed by cooling to room temperature. 160 parts by weight of polyethylene, 30 parts by weight of maleic anhydride-grafted polyethylene, 150 parts by weight of 60 mesh eucalyptus powder, 30 parts by weight of talc, 20 parts by weight of polyethylene wax, 20 parts by weight of magnesium stearate, and 5 parts by weight of iron oxide yellow are added. The speed is increased to 600 r / min and stirred for 50 min to obtain the composite board mixture. The composite board mixture is granulated using a granulator to obtain composite resin particles. The granulation temperature is set as follows: feeding section 190℃, plasticizing section 175℃, and extrusion section 170℃. Composite resin granules are placed into the hopper of a conical twin-screw extruder. The extruder operating temperature is set as follows: 190°C for the feeding section, 170°C for the plasticizing section, and 165°C for the extrusion section. High-performance composite board c is obtained by slow extrusion.

[0108] Example 4

[0109] The method for preparing the high-performance composite board is the same as in Example 1, except that: 100 parts by weight (100 mesh) of waste wind turbine blade powder and 20 parts by weight (2 cm) of degraded glass fiber from waste wind turbine blades are placed in a high-speed mixer and slowly stirred. 20 parts by weight (50% alcohol solution) of diluted silane coupling agent KH560 are sprayed on top. The speed is then increased to 600 r / min and stirring continues for 20 min, followed by cooling to room temperature. 160 parts by weight of polypropylene, 30 parts by weight of maleic anhydride-grafted polypropylene, 200 parts by weight of 60 mesh poplar powder, 30 parts by weight of calcium carbonate, 20 parts by weight of polyethylene wax, 20 parts by weight of calcium stearate, and 5 parts by weight of iron oxide red are added. The speed is increased to 600 r / min and stirred for 30 min to obtain the composite board mixture. The composite board mixture is granulated using a granulator to obtain composite resin particles. The granulation temperature is set as follows: 200℃ for the feeding section, 180℃ for the plasticizing section, and 170℃ for the extrusion section. Composite resin granules are placed into the hopper of a conical twin-screw extruder. The extruder operating temperature is set as follows: 200℃ for the feeding section, 180℃ for the plasticizing section, and 170℃ for the extrusion section. High-performance composite board d is obtained by slow extrusion.

[0110] Example 5

[0111] The method for preparing the high-performance composite board is the same as in Example 1, except that: 160 parts by weight (80 mesh) of waste wind turbine blade powder and 20 parts by weight (1 cm) of degraded glass fiber from waste wind turbine blades are placed in a high-speed mixer and slowly stirred. 40 parts by weight (60% alcohol solution) of diluted silane coupling agent KH550 are sprayed on top. The speed is then increased to 600 r / min and stirring continues for 20 min, followed by cooling to room temperature. 160 parts by weight of polyethylene, 60 parts by weight of maleic anhydride-grafted polyethylene, 160 parts by weight of 80 mesh poplar powder, 30 parts by weight of calcium carbonate, 20 parts by weight of polyethylene wax, 20 parts by weight of calcium stearate, and 5 parts by weight of iron oxide red are added. The speed is increased to 600 r / min and stirred for 50 min to obtain the composite board mixture. The composite board mixture is granulated using a granulator to obtain composite resin particles. The granulation temperature is set as follows: 200℃ for the feeding section, 180℃ for the plasticizing section, and 170℃ for the extrusion section. Composite resin granules are placed into the hopper of a conical twin-screw extruder. The extruder operating temperature is set as follows: 190°C for the feeding section, 175°C for the plasticizing section, and 160°C for the extrusion section. High-performance composite board e is obtained by slow extrusion.

[0112] Example 6

[0113] The method for preparing the high-performance composite material is the same as in Example 5, except that the particle size of the waste wind turbine blade powder is 300 mesh, and the high-performance composite material f is obtained.

[0114] Example 7

[0115] The method for preparing the high-performance composite board is the same as in Example 5, except that the length of the degraded glass fiber from the waste wind turbine blade is 4 cm, and g of high-performance composite board is obtained.

[0116] Example 8

[0117] The method for preparing the high-performance composite board is the same as in Example 5, except that the mass concentration of the silane coupling agent in the silane coupling agent dilution solution is 70%, and the high-performance composite board h is obtained.

[0118] Comparative Example 1

[0119] The method for preparing the high-performance composite board is the same as in Example 5, except that: waste wind turbine blades are not used to degrade the glass fiber to obtain the high-performance composite board i.

[0120] Comparative Example 2

[0121] The method for preparing the high-performance composite board is the same as in Example 5, except that: waste wind turbine blade powder, waste wind turbine blade degraded glass fiber, silane coupling agent KH550 diluted solution, polyethylene, maleic anhydride grafted polyethylene, 80-mesh poplar wood powder, calcium carbonate, polyethylene wax, calcium stearate and iron oxide red are added together to a high-speed mixer to mix the composite board and obtain the high-performance composite board j.

[0122] Comparative Example 3

[0123] The method for preparing the high-performance composite board is the same as in Example 5, except that: relative to 160 parts by weight of the thermoplastic resin, the content of the waste wind turbine blade powder is 300 parts by weight, the content of the waste wind turbine blade degraded glass fiber is 45 parts by weight, the content of the silane coupling agent is 55 parts by weight, the content of the compatibilizer is 60 parts by weight, the content of the wood flour is 300 parts by weight, the content of the filler is 55 parts by weight, the content of the lubricant is 50 parts by weight, the content of the release agent is 50 parts by weight, and the content of the pigment is 5 parts by weight, thereby obtaining the high-performance composite board k.

[0124] Test case

[0125] The high-performance composite boards a-k prepared in Examples 1-8 and Comparative Examples 1-3, as well as the recycled blade profile sample (provided by Warner Environmental Protection) and commercially available wood-plastic composite board (Shiteng Plastic Wood), were tested for tensile strength, flexural strength, and compressive strength using a universal testing machine. The universal testing machine used was a WDW-30 model from Sohnton Instruments. The tensile strength test method followed GB / T 1040.2-2006, the flexural strength test method followed GB / T 9341-2008, and the compressive strength test method followed GB / T 1041-2008. The test results are shown in Table 1.

[0126] Table 1 Performance parameters of high-performance composite panels

[0127]

[0128] As shown in Table 1, a comparison of the data from Examples 1-8 and Comparative Examples 1-5 reveals that the coupling effect between waste wind turbine blade powder and degraded glass fiber from waste wind turbine blades with thermoplastic resin is good. Furthermore, the synergistic effect of compatibilizers, wood flour, fillers, and lubricants enhances the mixing and stirring effect, enabling the waste wind turbine blade powder and degraded glass fiber to be uniformly dispersed in the high-performance composite board, thereby improving the tensile, flexural, and compressive physical properties of the composite board. A comparison of the data from Examples 5 and 6 shows that when the particle size of the waste wind turbine blade powder is 40-200 mesh, the tensile, flexural, and compressive physical properties of the composite board are improved. A comparison of the data from Examples 5 and 7 shows that when the length of the degraded glass fiber from waste wind turbine blades is 0.5-3 cm, the tensile, flexural, and compressive physical properties of the composite board are improved. A comparison of the data from Examples 5 and 8 shows that when the mass concentration of the silane coupling agent in the silane coupling agent dilution is 30-60%, it can improve the tensile, bending, and compressive physical properties of the composite board.

[0129] The preferred embodiments of this disclosure have been described in detail above. However, this disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and these simple modifications all fall within the protection scope of this disclosure.

[0130] It should also be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0131] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. A high-performance composite material prepared using waste wind turbine blades, characterized in that, The materials used to prepare this high-performance composite board include waste wind turbine blade material, silane coupling agent dilution, thermoplastic resin, compatibilizer, wood flour, filler, lubricant, release agent and pigment; The method for preparing this high-performance composite material includes: S1. The waste wind turbine blade material and silane coupling agent dilution are premixed in a high-speed mixer. The waste wind turbine blade material includes waste wind turbine blade powder and waste wind turbine blade degraded glass fiber. S2. The thermoplastic resin, compatibilizer, wood flour, filler, lubricant, release agent and pigment are fed into the high-speed mixer and mixed with the mixture in step S1 to obtain composite board mixture; S3. The composite board mixture is fed into a granulator for granulation to obtain composite resin particles. S4. The composite resin particles are fed into a conical twin-screw extruder for extrusion molding to obtain a high-performance composite board. Relative to 160 parts by weight of the thermoplastic resin, the content of the waste wind turbine blade powder is 50-200 parts by weight, the content of the waste wind turbine blade degraded glass fiber is 5-40 parts by weight, the content of the silane coupling agent diluent is 5-50 parts by weight, the content of the compatibilizer is 5-80 parts by weight, the content of the wood flour is 50-200 parts by weight, the content of the filler is 5-50 parts by weight, the content of the lubricant is 5-35 parts by weight, the content of the release agent is 5-35 parts by weight, and the content of the pigment is 1-10 parts by weight. The mass concentration of the silane coupling agent in the diluted solution is 30-60%. The particle size of the waste wind turbine blade powder is 40-200 mesh; The length of the degraded glass fiber in the waste wind turbine blades is 0.5-3cm.

2. The high-performance composite board according to claim 1, characterized in that, The silane coupling agent includes KH550 and / or KH560.

3. The high-performance composite board according to claim 1, characterized in that, Relative to 160 parts by weight of the thermoplastic resin, the content of the waste wind turbine blade powder is 100-180 parts by weight, the content of the waste wind turbine blade degraded glass fiber is 10-30 parts by weight, the content of the silane coupling agent diluent is 10-45 parts by weight, the content of the compatibilizer is 10-70 parts by weight, the content of the wood flour is 100-180 parts by weight, the content of the filler is 10-40 parts by weight, the content of the lubricant is 10-30 parts by weight, the content of the release agent is 10-30 parts by weight, and the content of the pigment is 2-8 parts by weight.

4. The high-performance composite board according to claim 1, characterized in that, The thermoplastic resin includes polypropylene and / or polyethylene; The wood flour includes poplar wood flour and / or eucalyptus wood flour; the particle size of the wood flour is 50-150 mesh; The compatibilizer includes maleic anhydride-grafted polypropylene and / or maleic anhydride-grafted polyethylene. The filler includes calcium carbonate and / or talc; The lubricant includes polyethylene wax; The release agent includes one or more of sodium stearate, magnesium stearate, and calcium stearate; The pigments include iron oxide red and / or iron oxide yellow.

5. A method for preparing the high-performance composite board according to any one of claims 1 to 4, characterized in that, The method includes: S1. The waste wind turbine blade material and the silane coupling agent dilution solution are fed into a high-speed mixer for premixing treatment; the waste wind turbine blade material includes waste wind turbine blade powder and waste wind turbine blade degraded glass fiber. S2. The thermoplastic resin, compatibilizer, wood flour, filler, lubricant, release agent and pigment are fed into the high-speed mixer and mixed with the mixture in step S1 to obtain composite board mixture; S3. The composite board mixture is fed into a granulator for granulation to obtain composite resin particles. S4. The composite resin particles are fed into a conical twin-screw extruder for extrusion molding to obtain a high-performance composite board.

6. The method according to claim 5, characterized in that, Step S1 includes: S11. The waste wind turbine blades are sequentially cut, crushed and sieved to obtain the waste wind turbine blade powder with a particle size of 40-200 mesh. S12. The waste wind turbine blades are sequentially cut, chemically degraded, washed, dried and segmented to obtain the degraded glass fiber of the waste wind turbine blades with a length of 0.5-3cm. S13. The waste wind turbine blade powder and the waste wind turbine blade degraded glass fiber are fed into the high-speed mixer for stirring, and the silane coupling agent dilution is sprayed in during the stirring process. S14. Continue stirring in the high-speed mixer for 10-30 minutes at a speed of 550-650 r / min; S15. Cool the mixture obtained in step S14 to 20-30℃.

7. The method according to claim 5, characterized in that, Step S3 further includes the following conditions for the granulation process: the temperature of the feeding section in the granulator is 160-210℃, the temperature of the plasticizing section in the granulator is 150-190℃, and the temperature of the extrusion section in the granulator is 140-180℃.

8. The method according to claim 5, characterized in that, Step S4 further includes the following conditions for extrusion molding: the temperature of the feeding section in the conical twin-screw extruder is 170-220℃, the temperature of the plasticizing section in the conical twin-screw extruder is 150-200℃, and the temperature of the extrusion section in the conical twin-screw extruder is 140-180℃.

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