A low density resin based composite material formed by oblique lay-up winding and a method of making the same

Abstract

This invention belongs to the field of resin-based composite material preparation technology, specifically disclosing a low-density ablation composite material formed by oblique stacking and winding and its preparation method, comprising a mixture of 20%–70% fiber cloth and 30%–80% resin by mass. The low-density ablation composite material prepared by this invention, through structural optimization and the use of oblique stacking and winding to form the composite material blank, improves the aerodynamic thermal shear state of the product surface, enhances the erosion resistance of the composite material product, and achieves density control of the composite material product by adjusting the content of glass hollow microspheres and the unit area mass of the fiber cloth. The density of the prepared composite material is 0.6 g / cm³. 3 ~1.3g / cm 3 This meets the requirements for preparing low-density composite material products.

Description

Technical Field

[0001] This invention belongs to the field of resin-based composite material preparation technology, specifically relating to a low-density ablation composite material formed by oblique stacking and winding and its preparation method. Background Technology

[0002] Ablation thermal protection is an active thermal protection method that reduces the transfer of heat to the interior of the ablation material or the aircraft by sacrificing the mass of the thermal protection material itself to remove a large amount of aerodynamic heat. Ablation thermal protection materials are suitable for short-term high heat flux environments.

[0003] Resin-based ablation materials belong to the carbonization-type ablation materials. They maintain normal operating temperatures within spacecraft through the synergistic effect of the heat absorption during the carbonization reaction of polymers, the heat flow barrier effect of pyrolysis gas, and the thermal insulation effect of the carbonized layer. High-carbon-residue resins are commonly used as the matrix material. Resin-based ablation materials possess characteristics such as high reliability, high cost-effectiveness, and simple assembly processes, and are widely used in the thermal protection systems of spacecraft such as spacecraft, recoverable satellites, and missiles. With the development of spacecraft, resin-based ablation materials are evolving towards lighter and more efficient designs.

[0004] Currently, existing technologies often introduce hollow microspheres into material systems to reduce product density. However, hollow microspheres tend to agglomerate, making it difficult for them to penetrate the fiber mesh. Uneven distribution of hollow microspheres also affects the performance of composite materials. Furthermore, resin-based ablation materials are often formed using molding and overlapping winding methods, resulting in products with high ablation rates and poor erosion resistance, which limits the application of resin-based ablation materials. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a low-density resin-based composite material formed by oblique stacking and winding, and its preparation method. By controlling the content of hollow glass microspheres and the unit area mass of two-dimensional fibers, a large density range of the composite material is controlled, with a density of 0.6 g / cm³. 3 ~1.3g / cm 3 This meets the requirements for preparing low-density composite material products.

[0006] To achieve the above objectives, the present invention employs the following technical solutions:

[0007] A low-density resin-based composite material formed by oblique stacking and winding includes 20% to 70% by weight of fiber cloth and 30% to 80% by weight of resin mixture;

[0008] The fiber cloth is made of a blend of inorganic and organic fibers, and the warp and weft density of the fiber cloth is 4 to 15 threads / cm, wherein the mass percentage of inorganic fibers is 40% to 80% and the mass percentage of organic fibers is 20% to 60%.

[0009] The resin mixture comprises phenolic resin, hollow glass microspheres, and organic solvent, wherein the phenolic resin accounts for 30% to 90% by mass, the hollow glass microspheres account for 5% to 60% by mass, and the remainder is organic solvent.

[0010] Preferably, the inorganic fiber is selected from one or more of quartz fiber, high silica fiber, alumina fiber, and zirconium oxide fiber.

[0011] Preferably, the organic fiber is selected from one or more of phenolic fiber, aramid fiber, and polyimide fiber.

[0012] Preferably, the phenolic resin is selected from one or more of magnesium phenolic resin, barium phenolic resin, and boron phenolic resin.

[0013] Preferably, the glass hollow microspheres have a particle size of 10 μm to 140 μm, a compressive strength of 1 MPa to 50 MPa, and a density of 0.08 g / cm³. 3 ~0.40g / cm 3 .

[0014] A method for preparing a low-density resin-based composite material formed by oblique stacking and winding includes the following preparation steps:

[0015] Step 1: Surface treatment of hollow glass microspheres;

[0016] Glass hollow microspheres were treated with sodium hydroxide solution, washed and dried, and then poured into an organic solvent of silane coupling agent. The mixture was stirred in a water bath at 60℃~90℃ for 0.5h~2h, and then washed and dried for later use.

[0017] Step 2: Preparation of the resin / glass microsphere mixture;

[0018] Surface-treated hollow glass microspheres, phenolic resin and organic solvent are poured into a reaction vessel and stirred at 25℃~80℃ for 12h~24h to obtain a mixture;

[0019] Step 3: Preparation of resin mixture film;

[0020] The resin / glass microsphere mixture is placed in an oven and placed at 50℃~100℃ for 30min~90min; the resin / glass microsphere mixture is poured into the mixer of a hot melt coating machine, and the resin / glass microsphere mixture is applied to the release paper by the action of the coating roller, hot plate and cooling plate to complete the film forming process, and then wound up under the action of the traction roller.

[0021] Step 4: Preparation of continuous prepreg;

[0022] The resin film roll and the fiber roll are installed on the fabric roller and arranged from top to bottom in the form of "film-fiber-film" sandwich structure to ensure that the edges of the upper and lower resin film layers are aligned. The "film-fiber-film" fabric roll passes through the pressure roller, heating plate, clamping roller and cold plate in succession. The prepreg that has been impregnated is wound up by the traction roller for later use.

[0023] Step 5: Cutting continuous fiber prepreg;

[0024] The shape and size of the prepreg tape for winding are determined based on the shape of the molded product and the thickness of the cured composite material blank. The cutting path of the cutting machine is designed and programmed, and then the cutting machine is used to cut the prepreg tape. The width of the prepreg tape for winding is D = d / sinβ, where d is the thickness of the low-density ablation composite material blank in mm and β is the skew angle in °.

[0025] Step 6: Oblique stacking and winding of composite material preforms;

[0026] Installation of oblique stacked cone sleeves: According to the predetermined oblique stacking and winding angle, that is, the angle β between the prepreg tape and the mold core generatrix, design the oblique stacking and winding cone sleeve. The angle between the oblique surface of the cone sleeve and the mold core generatrix is ​​the same as the oblique stacking angle. Then, install the cone sleeve at the winding start position of the laying mold.

[0027] Oblique wrapping; with the oblique surface of the conical sleeve as the starting position for oblique wrapping, the oblique wrapping advance amount s is set. The wrapping process is completed when the prepreg tape is obliquely wrapped to the specified position of the model or reaches the number of layers; where the advance amount of the wrapping tape s = h / sinβ, h is the thickness of the prepreg tape in mm.

[0028] Preferably, in step 3, during the preparation of the resin mixture film, the surface temperature of the coating roller of the hot melt coating machine is set to 60℃~90℃; the gap between the coating rollers is 0.1mm~0.5mm; the coating speed is maintained at 1m / min~8m / min; and the temperature of the cooling plate is controlled at -5℃~5℃.

[0029] Preferably, in step 4, during the resin film impregnation of the fiber, the hot plate temperature is set to 105°C, the clamping roller temperature is set to 90°C, the clamping roller gap is adjusted to 0.60~0.65mm, the traction speed is 5m / min, and the cooling plate temperature is -5°C.

[0030] Preferably, the oblique stacking angle β is 10° to 65°.

[0031] More preferably, the oblique stacking angle β is 15° to 40°.

[0032] Preferably, the process further includes vacuum curing and molding the winding blank obtained in step 6, specifically including the following steps:

[0033] Step 7: Vacuum pack the winding blanks, and from the surface of the product outwards, sequentially lay and cover the loose release film, absorbent adhesive, non-porous release film, breathable felt and high-temperature vacuum bag. Place the air nozzle for sampling in the area of ​​the vacuum bag without the product.

[0034] Step 8: Place the winding blank on the inlet trolley, connect the vacuum conduit inside the autoclave to the pre-installed vacuum nozzle inside the vacuum bag, and evacuate to a vacuum degree ≤ -0.09MPa. If there is no change in the vacuum degree inside the bag within five minutes, it means that the sealing test is qualified. Then push the inlet trolley into the autoclave for curing.

[0035] Step 9: After the composite material product is cured and removed from the can, the surface vacuum auxiliaries are removed, followed by machining and demolding to complete the product preparation and molding.

[0036] Preferably, the curing process in step 8 is as follows:

[0037] Temperature settings: Stage 1: Rise to 70℃~120℃, hold for 30min~90min; Stage 2: Rise to 120℃~160℃, hold for 30min~150min; Stage 3: Rise to 140℃~200℃, hold for 150min~300min; After the holding period, the furnace will begin to cool naturally, switching on and off when the temperature reaches 40℃~80℃; The heating rate is 0.5℃~3℃ / min.

[0038] Pressure settings: Stage 1: When the temperature inside the tank reaches 60℃~120℃, pressurize to 0.2MPa~0.5MPa and then hold pressure. The holding time is determined by the temperature. Stage 2: When the temperature inside the tank reaches 120℃~180℃, pressurize to 0.4MPa~0.9MPa. Holding pressure stage: After reaching the final specified pressure, continue to hold pressure. Depressurization: Depressurize until the temperature inside the furnace drops to 80℃~100℃. The pressurization rate during the reaction is 20KP / min~50KP / min, and the depressurization rate is 10KP / min~25KP / min.

[0039] The present invention has the following advantages:

[0040] (1) The present invention provides a low-density resin-based composite material formed by oblique stacking and winding. By controlling the content of glass hollow microspheres and the unit area mass of fiber cloth, the density of the composite material is controlled, and the density of the product is 0.6 g / cm³. 3 ~1.3g / cm 3 This meets the requirements for preparing low-density composite material products.

[0041] (2) The present invention provides a low-density resin-based composite material formed by oblique stacking and winding. The surface treatment of glass microspheres is carried out by silane coupling agent to ensure that the microspheres are uniformly dispersed in the resin solution. The organic fibers in the fiber reinforcement can ensure the mechanical performance requirements of the product. The inorganic fibers and glass microspheres are melt-coated on the surface of the product at high temperature in a high-temperature airflow environment, which prevents the heat flow to the interior of the product from eroding and improves the ablation performance of the composite material product.

[0042] (3) The present invention provides a low-density resin-based composite material formed by oblique stacking and winding. Through structural optimization, the composite material blank is formed by oblique stacking and winding, which improves the aerodynamic thermal flow shear state of the product surface and enhances the erosion resistance of the composite material product. Attached Figure Description

[0043] Figure 1 This is a schematic diagram of the oblique stacking and winding molding of the composite material blank of the present invention;

[0044] Figure 2 This is a surface morphology image of the specimen after hot air tunnel ablation in Example 1 of the present invention;

[0045] Figure 3 This is a surface morphology diagram of the specimen of Comparative Example 1 after hot air tunnel ablation. Detailed Implementation

[0046] The present invention will now be described in detail with reference to the accompanying drawings.

[0047] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0048] Example 1:

[0049] 1. Material composition and proportions:

[0050] (1) The fiber cloth is composed of high silica fiber (50%) and aramid fiber (50%), with a warp and weft fiber density of 7 fibers / cm, accounting for ~40% of the mass of the composite material;

[0051] (2) Phenolic resin: Barium phenolic resin (75%) and magnesium phenolic resin (25%) were selected as matrix resins, and the total mass percentage of the resin in the composite material was ~50%.

[0052] (3) Hollow glass microspheres: true density is ~0.15 g / cm³ 3 The average particle size is ~60μm, accounting for ~10% of the mass of the composite material;

[0053] Preparation process:

[0054] Step 1: Surface treatment of glass hollow microspheres; treat the glass hollow microspheres with 0.3 mol / L NaOH, stir at 80℃ for 1 h, wash and dry, then pour into a 0.5% KH560 ethanol solution, and magnetically stir for 1.5 h under 80℃ water bath heating; then wash the surface-treated glass hollow microspheres with ethanol, and after washing, put them into an oven and place at 100℃ for 10 h to complete drying.

[0055] Step 2: Stir glass hollow microspheres, phenolic resin and ethanol at 50°C for 3 hours, then pour into a vacuum reactor, evacuate, and stir at room temperature for 24 hours to obtain resin mixture solution.

[0056] Step 3: Place the resin mixture in an oven at 85°C for 45 minutes;

[0057] The hot plate temperature of the hot melt coating machine is set to 95℃, the coating roller temperature is set to 97℃, the traction speed is 4m / min, the coating roller gap is controlled between 0.18mm and 0.23mm, and the cooling plate temperature is set to -4℃.

[0058] The resin mixture is applied to the release paper by a coating roller, a hot plate, and a cooling plate to complete the film formation process, and then wound up under the action of a traction roller.

[0059] Step 4: Arrange the film roll and fiber roll according to the "film-fiber-film" structure;

[0060] During the resin film impregnation process of fibers, the hot plate temperature is set to 105℃, the clamping roller temperature is set to 90℃, the clamping roller gap is adjusted to 0.60~0.65mm, the traction speed is 5m / min, and the cooling plate temperature is -5℃.

[0061] After being subjected to the action of pressure rollers, hot plates, clamping rollers and cooling plates, the prepreg that has been impregnated is wound up by traction rollers for later use.

[0062] Step 5: Cut the 1000mm wide prepreg roll into several smaller widths of 40mm each, wrap them with prepreg fabric tape, and roll them up separately for later use.

[0063] Step 6: Determine the oblique layup angle β = 25°, and install the layup cone sleeve at the starting position of the mold; then, using the position of the mold cone sleeve as the starting point, begin obliquely layup and winding the blank on the mold surface. The three-dimensional diagram and cross-sectional winding diagram of the oblique layup are shown below. Figure 1 As shown;

[0064] Step 7: After the composite material blank is formed by oblique stacking and winding, lay 1 layer of non-porous release film, 2 layers of absorbent adhesive, 1 layer of non-porous release film and 1 layer of breathable felt from the inside to the outside. Use pressure-sensitive tape to glue and fix each layer of the auxiliary material.

[0065] Step 8: After being vacuum-packed and passing the airtightness test, the product is placed on a canning trolley for curing.

[0066] Step 9: The temperature and pressure settings for the autoclave are as follows:

[0067] (1) Temperature regime:

[0068] Hold at 90℃ for 120 min; hold at 150℃ for 60 min; hold at 180℃ for 30 min; then cool down with the furnace; the heating rate is 1℃ / min.

[0069] (2) Pressure system:

[0070] When the temperature inside the tank rises to 90℃, the pressure inside the tank rises to 0.3MPa; when the temperature rises to 150℃, the pressure rises to 0.5MPa and is maintained until the temperature inside the tank drops to 80℃, at which point the pressure is released; the pressure increase rate is 25KPa / min, and the pressure release rate is 25KPa / min.

[0071] Step 10: After the molding process is completed, remove the vacuum auxiliaries covering the surface of the composite material product, and demold and machine sample as required.

[0072] Samples of the composite material products were machined and tested for density, ablation performance, and related thermal properties. The density of the composite material product obtained using this material formulation and process flow was 0.74 g / cm³. 3 The average specific heat capacity (RT~100℃) is 1.5 J / g·K; the surface ablation morphology of the specimen, as determined by hot air tunnel testing, is as follows: Figure 2 As shown, the measured linear ablation rate of the sample was 0.020 mm / s, and the mass ablation rate was 16.65 g / m. 2 The tensile strength in the parent direction is 21 MPa, and the bending strength in the parent direction is 45 MPa.

[0073] Example 2:

[0074] 1. Material composition and proportions:

[0075] (1) The two-dimensional fiber fabric includes quartz fiber (74%) and phenolic fiber (26%), with a warp and weft fiber density of 15 fibers / cm, accounting for 55% of the mass of the composite material;

[0076] (2) Phenolic resin: Barium phenolic resin (100%) was selected as the matrix resin, and the total mass percentage of the resin in the composite material was ~40%.

[0077] (3) Hollow glass microspheres: true density is 0.24 g / cm³ 3 The average particle size is 55 μm, accounting for 5% of the mass of the composite material;

[0078] 2. Preparation process:

[0079] Step 1: Surface treatment of glass hollow microspheres; The glass hollow microspheres were treated with 0.5 mol / L NaOH and stirred at 85℃ for 1.5 h. After washing and drying, they were poured into a 1.5% KH560 ethanol solution and magnetically stirred for 2 h under water bath heating at 85℃. Then, the surface-treated glass hollow microspheres were washed with ethanol and placed in an oven at 105℃ for 12 h to complete the drying.

[0080] Step 2: Stir glass hollow microspheres, phenolic resin and ethanol at 60°C for 2 hours, then pour into a vacuum reactor, evacuate, and stir at 60°C for 12 hours to obtain resin mixture.

[0081] Step 3: Place the resin mixture in an oven at 55°C for 60 minutes;

[0082] The hot plate temperature of the hot melt coating machine is set to 75℃, the coating roller temperature is set to 55℃, the traction speed is 5m / min, the gap of the coating roller is controlled between 0.20mm and 0.22mm, and the cooling plate temperature is set to 0℃.

[0083] The resin mixture is applied to the release paper by a coating roller, a hot plate, and a cooling plate to complete the film formation process, and then wound up under the action of a traction roller.

[0084] Step 4: Arrange the film roll and fiber roll according to the "film-fiber-film" structure;

[0085] During the process of hot-melt impregnation of fibers with resin film, the hot plate temperature is set to 100℃, the clamping roller temperature is set to 100℃, the clamping roller gap is adjusted to 0.62~0.67mm, the traction speed is 3m / min, and the cooling plate temperature is -5℃.

[0086] After being subjected to the action of pressure rollers, hot plates, clamping rollers and cooling plates, the prepreg that has been impregnated is wound up by traction rollers for later use.

[0087] Step 5: Cut the 1000mm wide prepreg roll into several smaller widths of 40mm each, wrap them with prepreg fabric tape, and roll them up separately for later use.

[0088] Step 6: Determine the oblique stacking angle β = 25°, install the stacking cone sleeve at the starting position of the mold stacking; then, using the position of the mold cone sleeve as the starting point of winding, begin the oblique stacking and winding of the blank on the mold surface to form the shape;

[0089] Step 7: After the composite material blank is formed by oblique stacking and winding, lay 1 layer of non-porous release film, 1 layer of absorbent adhesive, 1 layer of non-porous release film and 1 layer of breathable felt from the inside to the outside. Use pressure-sensitive tape to glue and fix each layer of the auxiliary materials.

[0090] Step 8: After being vacuum-packed and passing the airtightness test, the product is placed on a canning trolley for curing.

[0091] Step 9: The temperature and pressure settings for the autoclave are as follows:

[0092] (1) Temperature regime:

[0093] Hold at 80℃ for 60 min; hold at 120℃ for 60 min; hold at 150℃ for 180 min; then cool down with the furnace; the heating rate during the process is 2℃ / min;

[0094] (2) Pressure system:

[0095] When the temperature inside the tank rises to 120℃, the pressure inside the tank rises to 0.2MPa; when the temperature rises to 150℃, the pressure rises to 0.7MPa and is maintained until the temperature inside the tank drops to 80℃, at which point the pressure is released; the pressurization rate is 40KPa / min.

[0096] Step 10: After the molding process is completed, remove the vacuum auxiliaries covering the surface of the composite material product, and demold and machine sample as required.

[0097] Samples of the composite material products were machined and tested for density, ablation performance, and related thermal properties. The density of the composite material product using this material composition and process flow was found to be 1.08 g / cm³. 3 The oxyacetylene ablation rate is 0.015 mm / s, the average specific heat capacity (RT~100℃) is 1.8 J / g·K, the tensile strength in the parent direction is 47 MPa, and the bending strength in the parent direction is 76 MPa.

[0098] Compared with Embodiment 1, this embodiment achieves the control of product density by changing the material component type, ratio and curing process parameters. As the density increases, the mechanical properties, ablation resistance and erosion resistance of the product are improved.

[0099] Comparative Example 1:

[0100] This comparative example uses the same composite material preparation process, material composition, and curing process parameters as Example 1, differing only in the oblique stacking angle, which is β = 0°, meaning the composite material preform is formed by repeated stacking. After curing, performance indicators such as density and ablation resistance were tested, and the density was measured to be 0.76 g / cm³. 3The average specific heat capacity (RT~100℃) is 1.6 J / g·K. The surface morphology of the specimen obtained by hot air tunnel testing under the same conditions as in Example 1 is as follows. Figure 3 As shown, the composite material on the surface of the test piece showed obvious peeling, exposing the underlying metal substrate. The density and average specific heat capacity of the repeatedly stacked composite material products were similar to those of the obliquely stacked products; however, the ablation resistance and erosion resistance of the products were significantly reduced, indicating that the oblique stacking method can improve the erosion resistance of the products.

[0101] This invention is not limited to the specific embodiments described above. The invention extends to any new feature or combination disclosed in this specification, as well as any new method or process step or combination disclosed herein.

Claims

1. A method for preparing a low-density resin-based composite material formed by oblique stacking and winding, characterized in that, The preparation steps include the following: Step 1: Surface treatment of hollow glass microspheres; The glass hollow microspheres were treated with sodium hydroxide solution, washed and dried, and then poured into an organic solvent of silane coupling agent. The mixture was stirred in a water bath at 60℃~90℃ for 0.5h~2h, and then washed and dried for later use. Step 2: Preparation of the resin / glass microsphere mixture; Surface-treated hollow glass microspheres, phenolic resin and organic solvent are poured into a reaction vessel and stirred at 25℃~80℃ for 12h~24h to obtain a mixture; Step 3: Preparation of resin mixture film; The resin / glass microsphere mixture is placed in an oven and placed at 50℃~100℃ for 30min~90min; the resin / glass microsphere mixture is poured into the mixer of a hot melt coating machine, and the resin / glass microsphere mixture is applied to the release paper by the action of the coating roller, hot plate and cooling plate to complete the film forming process, and then wound up under the action of the traction roller. Step 4: Preparation of continuous prepreg; The resin film roll and the fiber roll are installed on the fabric roller and arranged from top to bottom in the form of "film-fiber-film" sandwich structure to ensure that the edges of the upper and lower resin film layers are aligned. The "film-fiber-film" fabric roll passes through the pressure roller, heating plate, clamping roller and cold plate in succession. The prepreg that has been impregnated is wound up by the traction roller for later use. Step 5: Cutting continuous fiber prepreg; The shape and size of the prepreg tape for winding are determined based on the shape of the molded product and the thickness of the cured composite material blank. The cutting path of the cutting machine is designed and programmed, and then the cutting machine is used to cut the prepreg tape. The width of the prepreg tape for winding is D=d / sinβ, where d is the thickness of the low-density ablation composite material blank in mm and β is the oblique winding angle in °. Step 6: Oblique stacking and winding of composite material preforms; Installation of oblique stacking cone sleeves: Design oblique stacking winding cone sleeves according to the predetermined oblique stacking winding angle β. The angle between the oblique surface of the cone sleeve and the generatrix of the mold core mold should be the same as the oblique stacking angle β. Then install the cone sleeve at the winding start position of the laying mold. Oblique wrapping; with the oblique surface of the cone sleeve as the starting position for oblique wrapping, the oblique wrapping advance amount s is set. After the prepreg tape is obliquely wrapped to the specified position of the mold or reaches the required number of wrapping layers, the wrapping process is completed; where the advance amount of the wrapping tape s=h / sinβ, h is the thickness of the prepreg tape, in mm.

2. The method for preparing a low-density resin-based composite material by oblique stacking and winding according to claim 1, characterized in that, In step 3, during the preparation of the resin mixture film, the surface temperature of the coating roller of the hot melt coating machine is set to 60℃~90℃; the gap between the coating rollers is 0.1mm~0.5mm; the coating speed is maintained at 1m / min~8m / min; and the temperature of the cooling plate is controlled at -5℃~5℃.

3. The method for preparing a low-density resin-based composite material by oblique stacking and winding according to claim 1, characterized in that, In step 4, during the resin film impregnation of the fiber, the hot plate temperature is set to 105℃, the clamping roller temperature is set to 90℃, the clamping roller gap is adjusted to 0.60~0.65mm, the traction speed is 5m / min, and the cooling plate temperature is -5℃.

4. The method for preparing a low-density resin-based composite material by oblique stacking and winding according to claim 1, characterized in that, The oblique stacking angle β is 10°~65°.

5. The method for preparing a low-density resin-based composite material by oblique stacking and winding according to claim 4, characterized in that, The oblique stacking angle β is 15°~40°.

6. The method for preparing a low-density resin-based composite material by oblique stacking and winding according to claim 1, characterized in that, It also includes vacuum curing and molding the winding blank obtained in step 6, specifically including the following steps: Step 7: Vacuum pack the winding blank. From the surface of the winding blank outwards, sequentially lay and cover the perforated release film, absorbent adhesive, non-perforated release film, breathable felt, and high-temperature vacuum bag. Place the air nozzle for sampling in the non-product area inside the vacuum bag. Step 8: Place the vacuum-packed winding blank on the inlet trolley, connect the vacuum tube inside the autoclave to the pre-installed vacuum nozzle inside the vacuum bag, evacuate to a vacuum degree ≤ -0.09MPa, and if the vacuum degree does not change within five minutes, the vacuum bag sealing test is considered qualified. Push the winding blank and the inlet trolley into the autoclave together for curing. Step 9: After the composite material product is cured and removed from the can, the surface vacuum auxiliaries are removed, followed by machining and demolding to complete the product preparation and molding.

7. The method for preparing a low-density resin-based composite material by oblique stacking and winding according to claim 6, characterized in that, The curing process in step 8 is as follows: Temperature settings: Stage 1: Raise the room temperature to 70℃~120℃ and keep warm for 30min~90min; Stage 2: Raise the temperature to 120℃~160℃ and keep warm for 30min~150min. Three stages: heat up to 140℃~200℃ and hold for 150min~300min; after holding, start natural cooling with the furnace, and turn on and off when the temperature drops to 40℃~80℃; the heating rate during the process is 0.5℃~3℃ / min. Pressure settings: Stage 1: When the tank temperature reaches 60℃~120℃, pressurize to 0.2MPa~0.5MPa and then hold pressure. The holding time is determined by the temperature. Stage 2: When the tank temperature reaches 120℃~180℃, pressurize to 0.4MPa~0.9MPa. Holding pressure stage: After reaching the final specified pressure, continue to hold pressure. Depressurization: Depressurization begins when the furnace temperature drops to 80℃~100℃; the pressurization rate during the reaction is 20KP / min~50KP / min, and the depressurization rate is 10KP / min~25KP / min.

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