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CN-122008375-A - Carbonized balsawood core material for wind power blade and preparation method and application thereof

CN122008375ACN 122008375 ACN122008375 ACN 122008375ACN-122008375-A

Abstract

The application discloses a carbonized balsawood core material for a wind power blade, and a preparation method and application thereof, and relates to the technical field of wind power blades. The application discloses a preparation method of a carbonized balsa core material for a wind power blade, which comprises the following steps of cutting balsa logs into wood strips, sequentially carrying out carbonization treatment and drying treatment, and splicing to form a BLOCK blank; and (3) carrying out flush cutting repair, sanding, four-edge cutting, surface treatment, slotting and punching, cutting, chamfering and sleeve cutting on the BLOCK blank body in sequence to obtain the carbonized balsa core material for the wind power blade. According to the carbonized balsawood core material for the wind power blade, the water content is stably controlled to be 6% -8% for a long time on the premise of retaining the inherent advantages of low density and high specific strength of balsawood, and the dry shrinkage is less than or equal to 2%, so that the carbonized balsawood core material can adapt to the service requirements of the wind power blade.

Inventors

  • JIN GUIFEN
  • FAN AIRONG
  • QIAN JINPING
  • SHEN YAOMIN
  • YANG KUN

Assignees

  • 中威航空材料有限公司

Dates

Publication Date
20260512
Application Date
20260305

Claims (10)

  1. 1. The preparation method of the carbonized balsawood core material for the wind power blade is characterized by comprising the following steps of: Cutting balsawood logs into strips, sequentially carbonizing and drying, and then splicing to form a BLOCK blank; and (3) carrying out flush cutting repair, sanding, four-edge cutting, surface treatment, slotting and punching, cutting, chamfering and sleeve cutting on the BLOCK blank body in sequence to obtain the carbonized balsa core material for the wind power blade.
  2. 2. The method for preparing the carbonized balsawood core material for the wind turbine blade according to claim 1, wherein the carbonization treatment is performed in an atmospheric air environment, specifically comprising the steps of performing first heat preservation at a first temperature, then heating to a second temperature, performing second heat preservation at the second temperature, then heating to a third temperature, and performing third heat preservation at the third temperature.
  3. 3. The method for preparing a carbonized balsawood core material for a wind turbine blade according to claim 2, wherein the first temperature is 60-80 ℃, the first heat preservation time is 12-24 hours, and/or The second temperature is 125-135 ℃, the second heat preservation time is 24-36 h, and/or The third temperature is 140-180 ℃, and the third heat preservation time is 48-72 h.
  4. 4. The method for producing a carbonized balsawood core material for a wind turbine blade according to claim 2, wherein a rate of temperature rise from a first temperature to a second temperature is 0.5 to 1.0 ℃ per minute, and/or The temperature rising rate from the second temperature to the third temperature is 0.3-0.5 ℃ per minute.
  5. 5. The method for preparing the carbonized balsawood core material for the wind power blade according to claim 1, wherein the drying treatment is carried out at a temperature of 50-70 ℃ for 2-4 hours.
  6. 6. The method for producing a carbonized balsawood core material for a wind power blade according to claim 1, wherein the surface treatment specifically comprises the steps of: And (3) placing the carbonized balsawood core material with the four edges cut into 50-70 ℃ hot air, drying for 3-5 minutes, uniformly coating the surface of the core material with a composite hole sealing surface treating agent by adopting a roller coating, brushing or spraying mode, wherein the coating amount is 0.2-0.5 kg/m 2 , and irradiating the core material with ultraviolet light with the light intensity of 800-1200 mW/cm 2 for 10-30 seconds after coating to finish the surface treatment.
  7. 7. The method for preparing a carbonized balsawood core material for a wind turbine blade according to claim 6, wherein the method for preparing the composite hole sealing surface treating agent comprises the following steps: mixing glycidyl methacrylate, acrylamide, benzoyl peroxide and N, N-dimethylformamide, stirring for reaction, and then adding gamma-aminopropyl triethoxysilane for ring opening reaction to obtain an organic intermediate; Mixing activated metakaolin, dilute nitric acid, deionized water and absolute ethyl alcohol for reaction to obtain metakaolin-based aluminosilicate inorganic sol; And mixing the organic intermediate, metakaolin-based aluminosilicate inorganic sol, gamma-glycidol ether oxypropyl trimethoxy silane and a photoinitiator, and performing ultrasonic grafting reaction to obtain the composite hole sealing surface treating agent.
  8. 8. The method for producing a carbonized balsa wood core material for wind power blades according to claim 7, wherein the mass/volume ratio of glycidyl methacrylate, acrylamide, benzoyl peroxide, N-dimethylformamide and gamma-aminopropyl triethoxysilane is (50-70) g (20-30) g (0.5-1.5) g (150-200) mL (25-35) g, and/or The mass volume ratio of the activated metakaolin to the dilute nitric acid to the deionized water to the absolute ethyl alcohol is (8-15) g (80-100) mL (30-50) mL (20-30) mL, the volume concentration of the dilute nitric acid is 5% -10%, and/or The mass volume ratio of the organic intermediate to the metakaolin-based aluminosilicate inorganic sol to the gamma-glycidoxypropyl trimethoxysilane to the photoinitiator is (95-105) g (130-150) mL (1-3) g, the photoinitiator is selected from one or two of 1-hydroxycyclohexyl phenyl ketone or 2-hydroxy-2-methyl-1-phenyl-1-acetone, and/or The stirring reaction temperature is 70-80 ℃, the time is 3-5 h, the rotating speed is 100-200 r/min, the ring-opening reaction temperature is 80-100 ℃ and the time is 2-4 h, and/or The temperature of the ring-opening reaction is 80-100 ℃ and the time is 2-4 h, and/or The temperature of the mixing reaction is 60-70 ℃ and the time is 1-2 h, and/or The ultrasonic grafting reaction power is 250-350W, the temperature is 25-35 ℃ and the time is 30-50 min.
  9. 9. The carbonized balsawood core material for the wind power blades is characterized by being prepared by the preparation method of the carbonized balsawood core material for the wind power blades, wherein the moisture content of the carbonized balsawood core material is 6% -8%, the parallel compression strength is more than or equal to 10MPa, the vertical compression strength is more than or equal to 0.75MPa, the shear strength is more than or equal to 2.0MPa, the shear modulus is more than or equal to 160MPa, and the dry shrinkage rate is less than or equal to 2%.
  10. 10. A wind power blade, comprising a carbonized balsawood core material, wherein the carbonized balsawood core material is the carbonized balsawood core material for the wind power blade according to claim 9.

Description

Carbonized balsawood core material for wind power blade and preparation method and application thereof Technical Field The application relates to the technical field of wind power blades, in particular to a carbonized balsawood core material for a wind power blade, and a preparation method and application thereof. Background Wind power is used as a core support for global clean energy transformation, and the single machine capacity of a unit is increased to 15MW and above, the length of a blade breaks through 120 meters, and stringent requirements are set for the weight reduction, high dimensional stability and weather resistance of a sandwich structure core material. According to industry data statistics, the core material accounts for 30-40% of the weight of the blade, the performance of the core material directly determines the rigidity, fatigue life and manufacturing cost of the blade, and meanwhile market demands continuously rise. At present, the main stream core material mainly comprises PET foam, PVC foam, PMI foam and composite material honeycomb, but the wood-free core material has inherent technical bottlenecks, and is difficult to simultaneously meet the comprehensive requirements of low density, high specific strength, wet heat resistance and low cost. In order to solve the difficult problem of core material adaptation of the large wind power blade, two main core technical routes of foam and honeycomb are formed in the industry. The PET foam is mainly selected for small and medium-sized blades due to controllable cost and good processability, but key parts of wind power blades above 8MW are required to depend on imported PMI foam, the price of the PMI foam is 3-5 times of that of the PET foam, the humidity resistance and heat aging resistance of the PVC foam are poor, the retention rate of 1000h strength in an 85 ℃/85% RH environment is less than or equal to 70%, corrosive gas is easy to release, the PVC foam is gradually eliminated by the market, the composite material honeycomb has excellent mechanical property, the processing period is as long as 15-20 days, the forming efficiency is low, the requirement of large-scale production of the blades is difficult to adapt, and the aramid honeycomb is expensive and is only used for the ultra-large blade mass scene. In addition, the density of the emerging engineering plastic structural part is higher, the weight reduction effect of the blade is restricted, and the carbon fiber reinforced PEEK core material is still in the laboratory verification stage, so that the cost is too high and the industrialization is difficult. In addition, although natural balsawood is concerned by low density and high specific strength, the natural balsawood consistently has inherent defects of extremely high moisture content, has extremely high moisture absorption and moisture regaining capability, is easy to rebound in moisture content in the processing and transportation processes, can cause serious defects of bubbles, bursting, blushing, layering and the like in the process of blade pouring and forming, cannot meet the severe requirements of wind power blades on low moisture content of core materials, and therefore cannot be effectively applied to the wind power blade field for a long time. In view of the above technical drawbacks, there is a need for improvements in the prior art. Disclosure of Invention In view of the above, the application provides a carbonized balsawood core material for wind power blades, a preparation method and application thereof, and the carbonized balsawood core material for wind power blades can stably control the water content to 6% -8% for a long time on the premise of retaining the inherent advantages of low density and high specific strength of balsawood, and the dry shrinkage rate is less than or equal to 2%, so that the carbonized balsawood core material can adapt to the service requirements of wind power blades. In a first aspect, the application discloses a preparation method of a carbonized balsawood core material for a wind power blade, which comprises the following steps: A preparation method of carbonized balsawood core material for wind power blades comprises the following steps: Cutting balsawood logs into strips, sequentially carbonizing and drying, and then splicing to form a BLOCK blank; and (3) carrying out flush cutting repair, sanding, four-edge cutting, surface treatment, slotting and punching, cutting, chamfering and sleeve cutting on the BLOCK blank body in sequence to obtain the carbonized balsa core material for the wind power blade. According to the preparation method of the carbonized balsawood core material for the wind power blade, provided by the application, the process route is coherent, simple and controllable, the natural advantages of low density and high specific strength of the balsawood are maintained, the inherent defect that the natural balsawood is easy to absorb moisture and get damp is overcome thr