Polyaryletherketone thermoplastic composite material fan blade and preparation method thereof

Abstract

The invention provides a polyaryletherketone thermoplastic composite material fan blade and a preparation method thereof. The preparation method comprises the following steps: a) paving a polyaryletherketone prepreg in a fan blade mold, and carrying out vacuum heat setting to form a prepreg blank; and b) closing the prepreg blank obtained in the step a), performing hot press molding, demolding, and processing a finished product to obtain the polyaryletherketone thermoplastic composite material fan blade. Compared with the prior art, the preparation method provided by the invention selects specific raw material components to be matched with specific process steps to realize better integral interaction: the low-melting-point polyaryletherketone prepreg is used as the raw material of the blade, so that the forming temperature is lower, the forming manufacturability is better, and the production cost is lower; and meanwhile, the prepared fan blade has the dual advantages of weight reduction and impact resistance, and application of the thermoplastic composite material to an aero-engine is facilitated to be popularized.

Description

Technical Field

[0001] The present invention relates to the technical field of aircraft engine fan blades, and more specifically, to a polyaryletherketone thermoplastic composite fan blade and a preparation method thereof. Background Art

[0002] Aircraft engines generally refer to aircraft engines, which are aircraft power supply devices; their fan blades refer to the rotor blades at the front end of aircraft engines that provide thrust for the engine. In order to achieve higher flight efficiency and better performance, weight reduction has always been the goal pursued by aircraft and aircraft engines. Compared with metal materials, resin-based composite materials have higher specific strength and specific stiffness, and their structures are more designable, so they are widely used in the aviation field. Thrust-to-weight ratio is an important indicator for evaluating the performance of aircraft engines. In order to obtain a higher engine thrust-to-weight ratio, a common practice is to use high-performance resin-based composite materials instead of metal materials. The resin-based composite materials currently used in aircraft engines are mainly thermosetting composite materials such as epoxy, bismaleimide, and polyimide.

[0003] Thermoplastic composite materials refer to a type of resin-based composite materials whose resin matrix is ​​thermoplastic resin. The resin in its molding process has no curing and cross-linking reaction. It can be formed into the desired product by heating and melting, cooling and consolidating. It can be heated and re-molded repeatedly. Compared with thermosetting composite materials, thermoplastic composite materials have better impact resistance and thus higher damage tolerance. Using thermoplastic composite materials instead of thermosetting composite materials in aircraft engines can further improve the safety of the engine. At present, most aircraft engines still use metal fan blades, and a small number of them use epoxy resin-based composite blades. The use of thermoplastic composite materials to prepare aircraft engine fan blades can further improve the impact resistance of the blades, thereby improving the safety of the engine. However, there has been no report on the application of thermoplastic composite fan blades in the prior art, mainly because thermoplastic prepregs are non-sticky and non-deformable at room temperature, so it is difficult to complete the laying of fan blades, a complex curved structure product, by manual laying. One solution is to use automatic wire laying technology to complete the blade laying, but the automatic wire laying technology of thermoplastic composite materials is still in its infancy and cannot meet the demand. Summary of the invention

[0004] In view of this, the purpose of the present invention is to provide a polyaryletherketone thermoplastic composite fan blade and a preparation method thereof. The preparation method provided by the present invention can realize the laying and manufacturing of thermoplastic composite fan blades, which is conducive to promoting the application of thermoplastic composite materials in aircraft engines.

[0005] The present invention provides a method for preparing a polyaryletherketone thermoplastic composite fan blade, comprising the following steps:

[0006] a) laying the polyaryletherketone prepreg in a fan blade mold and forming a prepreg embryo through vacuum heat setting;

[0007] b) The prepreg body obtained in step a) is molded, hot-pressed, and processed into a finished product after demoulding to obtain a polyaryletherketone thermoplastic composite fan blade.

[0008] Preferably, before paving in step a), the process further comprises:

[0009] Clean the fan blade mold and apply 2 to 4 coats of high temperature resistant mold release agent, and then stick high temperature resistant polyimide double-sided tape on the surface of the fan blade mold;

[0010] The high temperature resistant polyimide double-sided adhesive has a temperature resistance of ≥360°C and does not leave adhesive on the surface of the adhered object.

[0011] Preferably, the paving process in step a) is specifically as follows:

[0012] a1) Cut the polyaryletherketone prepreg into narrow prepreg strips, and stick the narrow prepreg strips to the mold surface according to the laying angle to complete the first layer of prepreg laying;

[0013] a2) After the first layer is laid, use ultrasonic spot welding tools or electric heating rods to assist in laying and lay the second layer of prepreg on the surface of the first layer;

[0014] a3) After the first two layers are laid, they are packaged with high-temperature resistant polyimide bag film, and then vacuumed and heated to shape the prepreg;

[0015] a4) After the heat setting is completed, the vacuum bag is removed, the first and second layers of prepreg that have been stuck together and set are removed from the mold, the double-sided tape on the surface is torn off, and the mold is re-coated with 2 to 4 coats of high-temperature resistant release agent. After drying, the first two layers of prepreg are placed back on the mold surface and matched with the mold surface. The prepreg process edge is fixed to the mold surface with a high-temperature resistant polyimide tape;

[0016] a5) Lay out the layers according to the design. With the assistance of laser projection, repeat steps a2) to a4) to complete the placement of the remaining layers. Perform vacuum heat setting every 2 to 10 layers to obtain a prepreg body.

[0017] Preferably, in step a1), the width of the prepreg tape is 10 mm to 40 mm. In places where the distortion is small, the width of the prepreg tape is increased, and in places where the distortion is large, a prepreg tape with a smaller width is used.

[0018] Preferably, in step a1), a special-shaped prepreg tape is used to fill the gap between the two prepreg tapes. The filling prepreg tape matches the gap, a gap of less than 2 mm is allowed, and no overlap of the prepreg is allowed.

[0019] Preferably, the vacuum degree of the vacuum heat setting in step a) is not less than -0.095 MPa, the heating method is heating with a hot air gun, high temperature oven or autoclave, the heating temperature is 280°C to 380°C, and the heating time is 1 min to 10 min.

[0020] Preferably, the process of mold closing in step b) is specifically as follows:

[0021] After all the layers are laid, the upper mold is covered and the mold is closed; temperature measuring thermocouples are arranged inside the upper and lower molds to monitor the mold temperature.

[0022] Preferably, the hot pressing molding in step b) adopts a high temperature and high pressure hot pressing machine; the temperature of the hot pressing molding is 340° C. to 390° C., the pressure is 2 MPa to 10 MPa, and the time is 30 min to 150 min.

[0023] Preferably, the demoulding temperature in step b) is below 150°C;

[0024] The finished product is processed by cutting off the process edge by digital die to obtain the polyaryletherketone thermoplastic composite material fan blade.

[0025] The present invention also provides a polyaryletherketone thermoplastic composite fan blade, which is prepared by the preparation method described in the above technical solution.

[0026] The present invention provides a polyaryletherketone thermoplastic composite fan blade and a preparation method thereof; the preparation method comprises the following steps: a) laying a polyaryletherketone prepreg in a fan blade mold, and forming a prepreg body by vacuum heat setting; b) after the prepreg body obtained in step a) is molded, hot pressing is performed, and the finished product is processed after demolding to obtain a polyaryletherketone thermoplastic composite fan blade. Compared with the prior art, the preparation method provided by the present invention selects specific raw material components and specific process steps to achieve better overall interaction: using a low-melting-point polyaryletherketone prepreg as the raw material of the blade, the molding temperature is lower, and the molding processability is better. At the same time, the prepared fan blade has the dual advantages of weight reduction and impact resistance, which is conducive to promoting the application of thermoplastic composite materials in aircraft engines.

[0027] At the same time, the preparation method provided by the present invention has a simple process, easy-to-operate steps, mild and easy-to-control conditions, and solves the problem of difficult laying of thermoplastic composite materials through a specific laying method, and has broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the structure of the polyaryletherketone thermoplastic composite fan blade provided by the present invention. DETAILED DESCRIPTION

[0029] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] The present invention provides a method for preparing a polyaryletherketone thermoplastic composite fan blade, comprising the following steps:

[0031] a) laying the polyaryletherketone prepreg in a fan blade mold and forming a prepreg embryo through vacuum heat setting;

[0032] b) The prepreg body obtained in step a) is molded, hot-pressed, and processed into a finished product after demoulding to obtain a polyaryletherketone thermoplastic composite fan blade.

[0033] The present invention provides a polyaryletherketone thermoplastic composite fan blade and a preparation method thereof, which mainly solves the problem of poor impact resistance of thermosetting composite fan blades and the difficulty of paving and molding complex curved surfaces of thermoplastic composite fan blades. Existing metal fan blades are heavy. Using composite materials instead of metal materials to prepare engine fan blades can significantly reduce the weight of the blades (the density of the composite material is generally 1.6g / cm 3 The density of titanium alloy is about 4.5g / cm 3 Around); however, thermosetting composite materials have poor impact resistance and are easily damaged by bird strikes, affecting the normal operation of the engine; while thermoplastic composite fan blades have better impact resistance and better bird strike resistance. At the same time, thermoplastic composites have other advantages, such as prepregs have a nearly unlimited storage period at room temperature, which can reduce the transportation and storage costs of prepregs, and is conducive to reducing the manufacturing cost of blades; thermoplastic composites can be molded multiple times, so damage repair can be achieved, reducing the cost of use and maintenance. However, thermoplastic composites have the following disadvantages: prepregs are non-sticky at room temperature and are difficult to lay, especially for complex structure products, so their application is limited.

[0034] On this basis, the present invention proposes a method for laying blades on a complex structure mold, which realizes the manufacture of composite blades with variable curvature and variable thickness with a torsional structure. Through the method described in the present invention, the laying and manufacturing of thermoplastic composite fan blades can be realized, which is conducive to promoting the application of thermoplastic composite materials in aircraft engines.

[0035] The present invention firstly lays the polyaryletherketone prepreg in a fan blade mold and forms a prepreg embryo through vacuum heat setting.

[0036] In the present invention, the polyaryletherketone is a thermoplastic resin matrix with good toughness and better molding processability than polyetheretherketone. The present invention has no special restrictions on the source of the polyaryletherketone prepreg, and commercial products known to those skilled in the art can be used.

[0037] In the present invention, before paving, preferably a mold preparation step is also included:

[0038] Clean the fan blade mold and apply 2 to 4 coats of high-temperature resistant mold release agent, and then stick high-temperature resistant polyimide double-sided tape on the surface of the fan blade mold.

[0039] In the present invention, the temperature resistance of the high temperature resistant polyimide double-sided adhesive is preferably ≥360°C, and no adhesive is left on the surface of the adhered object.

[0040] In the present invention, before the double-sided tape is applied to the mold, it is preferred to use a target and laser projection to determine the prepreg placement area and angle at the mold surface.

[0041] In the present invention, the paving process is the preform paving process, specifically laying multiple layers of prepreg layer by layer to form a prepreg blank with a certain shape, mainly including: mold tape, first layer paving, second layer paving and remaining layer paving.

[0042] In the present invention, the paving process is preferably specifically as follows:

[0043] a1) Laying the first layer of prepreg: Cut the polyaryletherketone prepreg into narrow prepreg tapes, and stick the narrow prepreg tapes to the mold surface according to the laying angle to complete the laying of the first layer of prepreg;

[0044] a2) Laying the second layer of prepreg: After the first layer is laid, use ultrasonic spot welding tools or electric heating rods to assist in laying and lay the second layer of prepreg on the surface of the first layer;

[0045] a3) Vacuum heat setting: After the first two layers are laid, they are packaged with high-temperature resistant polyimide bag film, and then vacuum-heated to set the prepreg;

[0046] a4) After the heat setting is completed, the vacuum bag is removed, the first and second layers of prepreg that have been stuck together and set are removed from the mold, the double-sided tape on the surface is torn off, and the mold is re-coated with 2 to 4 coats of high-temperature resistant release agent. After drying, the first two layers of prepreg are placed back on the mold surface and matched with the mold surface. The prepreg process edge is fixed to the mold surface with a high-temperature resistant polyimide tape;

[0047] a5) Lay the layers according to the design, and repeat steps a2) to a4) with the assistance of laser projection to complete the laying of the remaining layers, and perform vacuum heat setting every 2 to 10 layers, preferably 2 to 5 layers, more preferably 2 to 3 layers, to obtain a prepreg body.

[0048] In the present invention, the width of the prepreg tape in step a1) is preferably 10 mm to 40 mm, more preferably 20 mm to 30 mm. In places where the distortion is small, the width of the prepreg tape is increased, and in places where the distortion is large, a prepreg tape with a smaller width is used.

[0049] In the present invention, in step a1), a special-shaped prepreg tape is used to fill the gap between two prepreg tapes. The filling prepreg tape matches the gap, allowing a gap of less than 2 mm, and no prepreg overlap is allowed.

[0050] In the present invention, the vacuum degree of the vacuum heat setting is preferably not less than -0.095MPa, and the heating method is preferably hot air gun heating, high temperature oven heating or autoclave heating. For ease of operation, hot air gun heating is more preferred; the heating temperature of the vacuum heat setting is preferably 280°C~380°C, more preferably 320°C~360°C, and the heating time is preferably 1min~10min, more preferably 2min~5min.

[0051] The present invention has no special restrictions on the specific method of the above-mentioned laying. The blade laying can be completed by manual laying or automatic wire laying process well known to those skilled in the art. At the same time, the laying of the above-mentioned first layer of prepreg is preferably limited by the process steps and specific conditions of the above-mentioned step a1).

[0052] After obtaining the prepreg body, the present invention molds the obtained prepreg body, performs hot pressing molding, and processes the finished product after demoulding to obtain a polyaryletherketone thermoplastic composite material fan blade.

[0053] In the present invention, the process of mold closing is preferably as follows:

[0054] After all the layers are laid, the upper mold is covered and the mold is closed; temperature measuring thermocouples are arranged inside the upper and lower molds to monitor the mold temperature.

[0055] In the present invention, the hot pressing molding preferably adopts a high temperature and high pressure hot press; the temperature of the hot pressing molding is preferably 340°C~390°C, more preferably 350°C~360°C, the pressure is preferably 2MPa~10MPa, more preferably 5MPa~8MPa, and the time is preferably 30min~150min, more preferably 100min~120min.

[0056] In the present invention, the demoulding process is preferably specifically as follows:

[0057] After hot pressing, cool to below 150°C and demould.

[0058] In the present invention, the process of finished product processing is preferably specifically as follows:

[0059] After demoulding, the process edge is cut off according to the digital model to complete the preparation of the polyaryletherketone thermoplastic composite fan blade.

[0060] The preparation method provided by the present invention selects specific raw material components and cooperates with specific process steps to achieve overall good interaction: using low-melting-point polyaryletherketone prepreg as the raw material of the blade, the molding temperature is lower and the molding processability is better. At the same time, the prepared fan blade has the dual advantages of weight reduction and impact resistance, which is conducive to promoting the application of thermoplastic composite materials in aircraft engines; at the same time, the preparation method provided by the present invention has a simple process, easy steps to operate, mild conditions and easy control, and solves the problem of difficult laying of thermoplastic composite materials through a specific laying method, and has broad application prospects.

[0061] The present invention also provides a polyaryletherketone thermoplastic composite fan blade, which is prepared by the preparation method described in the above technical solution.

[0062] In the present invention, the polyaryletherketone thermoplastic composite fan blade refers to an aircraft engine fan blade prepared using a polyaryletherketone thermoplastic composite material, and its structural schematic diagram is as shown in Figure 1 As shown, the fan blade is a variable curvature and variable thickness structure with a torsional structure, including a tenon root and a blade body part; wherein the polyaryletherketone thermoplastic composite material refers to a carbon fiber reinforced composite material whose resin matrix is ​​a polyaryletherketone thermoplastic resin, and is prepared by the preparation method using a thermoplastic composite material using a hot pressing process as described in the above technical scheme (the overall process includes: mold preparation, preform paving, mold closing, hot pressing molding, demolding, and processing).

[0063] The present invention has the following beneficial effects:

[0064] On the one hand, the present invention prepares polyaryletherketone thermoplastic composite fan blades, while there is no report on polyaryletherketone thermoplastic composite fan blades in existing patents; compared with metal fan blades, the fan blades provided by the present invention have the advantage of weight reduction; compared with thermosetting composite fan blades, the fan blades provided by the present invention have better impact resistance, and their application in aircraft engines can improve engine safety and overall efficiency; test results show that compared with thermosetting composites, thermoplastic composites have a smaller impact damage area under the same conditions.

[0065] On the other hand, the present invention provides a method for forming a thermoplastic composite fan blade, which is mainly a laying forming method, and solves the problem of the difficulty of laying thermoplastic composite materials; the advantage of thermoplastic composite materials is their good impact performance, and the disadvantage is that the prepreg is not sticky at room temperature. For products with complex structures such as fan blades, laying prepreg is a major problem, which is mainly reflected in the following three aspects: first, the first layer is laid, and it does not stick to the mold; second, the prepreg is not easy to deform during the laying process, and it is difficult to adapt to the blade structure; third, during the laying process, the prepreg is not sticky, resulting in a large number of layers, and the preform is not solid and cannot be molded. The present invention proposes to use high-temperature resistant double-sided tape for the first layer, and then tear off the double-sided tape after the two layers of prepreg are pasted to each other for shaping, so as to solve the problem of laying the first layer; secondly, the prepreg is not easy to deform, and the present invention adopts the method of cutting the prepreg into narrow strips for laying, which not only ensures the laying efficiency, but also does not require complex equipment; thirdly, the present invention uses a method of regularly vacuuming hot air heating and shaping, so that the prepreg can be compacted layer by layer during the laying process, which is conducive to the final mold of the blank product.

[0066] The present invention provides a polyaryletherketone thermoplastic composite fan blade and a preparation method thereof; the preparation method comprises the following steps: a) laying a polyaryletherketone prepreg in a fan blade mold, and forming a prepreg body by vacuum heat setting; b) after the prepreg body obtained in step a) is molded, hot pressing is performed, and the finished product is processed after demolding to obtain a polyaryletherketone thermoplastic composite fan blade. Compared with the prior art, the preparation method provided by the present invention selects specific raw material components and specific process steps to achieve better overall interaction: using a low-melting-point polyaryletherketone prepreg as the raw material of the blade, the molding temperature is lower, and the molding processability is better. At the same time, the prepared fan blade has the dual advantages of weight reduction and impact resistance, which is conducive to promoting the application of thermoplastic composite materials in aircraft engines.

[0067] At the same time, the preparation method provided by the present invention has a simple process, easy-to-operate steps, mild and easy-to-control conditions, and solves the problem of difficult laying of thermoplastic composite materials through a specific laying method, and has broad application prospects.

[0068] To further illustrate the present invention, the following examples are used to provide a detailed description. The raw materials used in the following examples of the present invention are all commercially available, wherein the prepreg used is a homemade polyaryletherketone prepreg, specifically T800 / EC-PAEK, and the resin melting temperature is 316°C.

[0069] Example 1

[0070] A polyaryletherketone thermoplastic composite fan blade and a preparation method thereof, wherein the fan blade is prepared using the polyaryletherketone composite material, and the preparation method is as follows:

[0071] Step 1: Mold preparation, mold cleaning and three coats of high temperature resistant mold release agent, use target and laser projection to place prepreg on the mold surface;

[0072] Double-sided tape for mold: Stick high-temperature resistant polyimide double-sided tape on the surface of the mold. The double-sided tape can withstand temperatures above 360°C. The double-sided tape should not leave any glue on the surface of the object being pasted.

[0073] Step 2: Preform paving, laying multiple layers of prepreg layer by layer to form a prepreg embryo with a certain shape;

[0074] The prefabricated body paving includes mold tape, first layer paving, second layer paving and remaining layer paving;

[0075] First layer prepreg laying: the prepreg is cut into narrow prepreg tapes, and the narrow prepreg tapes are pasted to the mold surface according to the laying angle to complete the first layer of prepreg laying;

[0076] The width of the prepreg tape is 20mm~30mm. In places with less distortion, the width of the prepreg tape can be widened. In places with greater distortion, a smaller width of prepreg tape can be used.

[0077] Special-shaped prepreg tapes should be used to fill the gap between two prepreg tapes. The filling prepreg tape should match the gap, allowing a gap of less than 2mm, and prepreg overlap is not allowed.

[0078] Step 3: Laying the second layer of prepreg: After the first layer is laid, use an electric heating rod to assist in laying and lay the second layer of prepreg on the surface of the first layer.

[0079] Step 4: Vacuum heat setting: After the first two layers are laid, they are packaged with high-temperature resistant polyimide bag film, and then vacuum-heated to set the prepreg;

[0080] The vacuum degree of vacuum pumping shall not be less than -0.095MPa;

[0081] The heating method is to use a hot air gun, the heating temperature is 320℃~360℃, and the heating time is 3min;

[0082] After heat setting is completed, remove the vacuum bag, remove the first and second layers of prepreg that have been stuck together and set from the mold, tear off the double-sided tape on the surface, re-apply three coats of high-temperature resistant release agent to the mold, and after drying, put the first two layers of prepreg back on the mold surface and match them with the mold surface. Use high-temperature resistant polyimide tape to fix the prepreg process edge to the mold surface.

[0083] Step 5: Lay the layers according to the design. With the assistance of laser projection, repeat steps 3 and 4 to complete the laying of the remaining layers. Perform vacuum heat setting every 2 to 3 layers.

[0084] Step 6: Mold closing. After all layers are laid out, cover the upper mold to complete the mold closing. Temperature measuring thermocouples are arranged inside the upper and lower molds to monitor the mold temperature.

[0085] Step 7: Hot pressing molding, using a high temperature and high pressure hot press machine to complete the hot pressing molding of the thermoplastic composite fan blade;

[0086] The molding temperature is 360°C, the molding pressure is 8MPa, and the molding time is 120min.

[0087] Step 8: After hot pressing, cool down to below 150℃ and demould.

[0088] Step 9: After demoulding, cut off the process edge according to the digital model to complete the manufacturing of thermoplastic composite fan blades; see the product structure diagram Figure 1 As shown, the product density is 1.6g / cm 3 .

[0089] Performance Test:

[0090] A bird strike comparison test was conducted on the polyaryletherketone thermoplastic composite fan blade prepared in Example 1 and a conventional thermosetting composite fan blade. The test conditions and results are shown in Table 1.

[0091] Table 1 Fan blade impact conditions and results

[0092]

[0093] The test results show that compared with thermosetting composites, thermoplastic composites have a smaller impact damage area, reflecting the good impact resistance of thermoplastic composite fan blades.

[0094] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for preparing a polyaryletherketone thermoplastic composite fan blade, comprising the following steps: a) laying the polyaryletherketone prepreg in a fan blade mold and forming a prepreg embryo through vacuum heat setting; b) The prepreg body obtained in step a) is molded, hot-pressed, and processed into a finished product after demoulding to obtain a polyaryletherketone thermoplastic composite fan blade.

2. The preparation method according to claim 1, characterized in that: Before the paving in step a), the process further comprises: Clean the fan blade mold and apply 2 to 4 coats of high temperature resistant mold release agent, and then stick high temperature resistant polyimide double-sided tape on the surface of the fan blade mold; The high temperature resistant polyimide double-sided adhesive has a temperature resistance of ≥360°C and does not leave adhesive on the surface of the adhered object.

3. The preparation method according to claim 1, characterized in that: The paving process in step a) is specifically as follows: a1) Cut the polyaryletherketone prepreg into narrow prepreg strips, and stick the narrow prepreg strips to the mold surface according to the laying angle to complete the first layer of prepreg laying; a2) After the first layer is laid, use ultrasonic spot welding tools or electric heating rods to assist in laying and lay the second layer of prepreg on the surface of the first layer; a3) After the first two layers are laid, they are packaged with high-temperature resistant polyimide bag film, and then vacuumed and heated to shape the prepreg; a4) After the heat setting is completed, the vacuum bag is removed, the first and second layers of prepreg that have been stuck together and set are removed from the mold, the double-sided tape on the surface is torn off, and the mold is re-coated with 2 to 4 coats of high-temperature resistant release agent. After drying, the first two layers of prepreg are placed back on the mold surface and matched with the mold surface. The prepreg process edge is fixed to the mold surface with a high-temperature resistant polyimide tape; a5) Lay out the layers according to the design. With the assistance of laser projection, repeat steps a2) to a4) to complete the placement of the remaining layers. Perform vacuum heat setting every 2 to 10 layers to obtain a prepreg body.

4. The preparation method according to claim 3, characterized in that: In step a1), the width of the prepreg tape is 10 mm to 40 mm. In places where the distortion is small, the width of the prepreg tape is increased, and in places where the distortion is large, a prepreg tape with a smaller width is used.

5. The preparation method according to claim 3, characterized in that: In step a1), a special-shaped prepreg tape is used to fill the gap between the two prepreg tapes. The filling prepreg tape matches the gap, allowing a gap of less than 2 mm, and no prepreg overlap is allowed.

6. The preparation method according to claim 1, characterized in that: The vacuum degree of the vacuum heat setting in step a) is not less than -0.095 MPa, the heating method is heating with a hot air gun, heating in a high temperature oven or heating in an autoclave, the heating temperature is 280°C to 380°C, and the heating time is 1 min to 10 min.

7. The preparation method according to claim 1, characterized in that: The process of mold closing in step b) is specifically as follows: After all the layers are laid, the upper mold is covered and the mold is closed; temperature measuring thermocouples are arranged inside the upper and lower molds to monitor the mold temperature.

8. The preparation method according to claim 1, characterized in that: The hot pressing molding in step b) adopts a high temperature and high pressure hot pressing machine; the temperature of the hot pressing molding is 340° C. to 390° C., the pressure is 2 MPa to 10 MPa, and the time is 30 min to 150 min.

9. The preparation method according to claim 1, characterized in that: The demoulding temperature in step b) is below 150°C; The finished product is processed by cutting off the process edge by digital die to obtain the polyaryletherketone thermoplastic composite material fan blade.

10. A polyaryletherketone thermoplastic composite fan blade, characterized in that: The method is prepared by any one of claims 1 to 9.

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