Thermoplastic composite ballistic resistant panel and process for making same

Abstract

The application provides a thermoplastic composite impact-resistant plate and a preparation process thereof. The thermoplastic composite impact-resistant plate comprises a main plate, the two sides of the main plate are provided with reinforcing beams, the main plate is provided with transverse reinforcing ribs and longitudinal reinforcing ribs, the transverse reinforcing ribs extend along the width direction of the main plate, the longitudinal reinforcing ribs extend along the length direction of the main plate, and the main plate and the reinforcing beams are connected through a mortise and tenon structure. The application compensates for the defect of low bonding strength of the thermoplastic composite through the mortise and tenon structure connection mode, and achieves the goal of balancing the bearing capacity of the impact-resistant plate. The application adopts the method of combining the impact-resistant structure with the thermoplastic composite, and prepares a thermoplastic product different from the existing impact-resistant plate structure through vacuum bag pressure molding.

Description

Technical Field

[0001] This application relates to the field of composite material structure molding technology, specifically to a thermoplastic composite impact resistance plate and its preparation process. Background Technology

[0002] Carbon fiber reinforced resin matrix composites possess a series of advantages, including high specific strength, specific stiffness, corrosion resistance, and excellent impact energy absorption, making them the preferred material in the aerospace field. According to foreign research, composite material structures exhibit superior impact energy absorption compared to aluminum alloy components. Under the same geometric dimensions and weight, composite material structures absorb almost 2.7 times the energy of aluminum alloy components, and composite material samples absorb almost 1.33 times the energy per unit length compared to aluminum alloy samples. Currently, impact damage is the most prevalent damage mode throughout the entire service life of composite materials. While thermoset composites offer better impact energy absorption than metals, they still suffer from relatively low impact energy absorption and small damage tolerance, leading to secondary failure modes after impact damage. Furthermore, thermoset composites are difficult to repair after impact damage and cannot be reused after product failure.

[0003] Compared to thermosetting composites, thermoplastic composites exhibit a linear molecular structure in their resin matrix. The molecules deform significantly under external forces, resulting in toughness more than 10 times that of thermosetting resins. This allows for repeated heating and melting, enabling reuse and effectively reducing maintenance costs. Currently, glass fiber reinforced polyphenylene sulfide (GF / PPS) thermoplastic composites are used in the leading edge of the Airbus A380 wing, achieving a 25% weight reduction compared to thermosetting composites. Fokker has fabricated torque box test specimens using carbon fiber reinforced polyether ether ketone (CF / PEEK) thermoplastic composites, achieving stiffener bonding through welding. The Spanish Composites Research and Application Center (FIDAMC) has developed a tooling for laying thermoplastic composite support structures, using automated and autoclave-free methods to fabricate wing structures. Despite the excellent mechanical properties of thermoplastic composites, in harsh operating conditions, it is necessary to optimize process parameters such as structural dimensions, fiber distribution, and fiber content, based on the structural service conditions and constraints related to product stiffness and strength, to achieve the maximum weight reduction. Wang Ru et al. used the Kriging model and a series of quadratic programming methods in ISIGHT to optimize the structure of composite thin-walled stiffened plates, and optimized parameters such as layup sequence and number of layups based on the optimization results. Almeida et al. used a genetic algorithm (GA) to optimize the cross-section of the structure. Based on the TFP process considering manufacturing characteristics, they applied constraints to generate feasible fiber patterns for manufacturing, and improved the stiffness of specific structures by 22.0% through cross-section optimization.

[0004] Impact resistance plates have high load-bearing requirements and are characterized by diverse and varied load distribution. Current technology has not reported the use of thermoplastic composites to prepare impact resistance plates. Due to the low bond strength of thermoplastic composites, if existing impact resistance plate molding processes are used to fabricate impact resistance plates with existing structures, the resulting plates will exhibit uneven load-bearing capacity. Summary of the Invention

[0005] To address one of the aforementioned technical deficiencies, this application provides a thermoplastic composite impact resistance plate and its preparation process. This application combines an impact-resistant structure with thermoplastic composite materials, using vacuum bag compression molding to prepare the impact resistance plate. Based on the load distribution characteristics of the impact resistance plate, transverse and longitudinal reinforcing ribs are used for targeted reinforcement to maximize impact resistance. Furthermore, the thermoplastic composite impact resistance plate provided in this application has a tenon and mortise structure. This tenon and mortise connection compensates for the low bonding strength of thermoplastic composite materials, thus balancing the load-bearing capacity of the impact resistance plate.

[0006] In a first aspect, embodiments of this application provide a thermoplastic composite impact resistance plate including a main board, with reinforcing beams on both sides of the main board, and transverse reinforcing ribs and longitudinal reinforcing ribs provided on the main board. The transverse reinforcing ribs extend along the width direction of the main board, and the longitudinal reinforcing ribs extend along the length direction of the main board. The main board and the reinforcing beams are connected by a mortise and tenon structure.

[0007] Preferably, the motherboard includes an impact-resistant part and two connecting parts, which are symmetrically arranged on both sides of the impact-resistant part. The cross-section of the impact-resistant part has a waveform structure, which includes at least one of an arc wave, a sine wave, a cosine wave, a triangular wave, and a rectangular wave.

[0008] More preferably, the thickness of the connecting part gradually increases from the end near the impact-resistant part to the end away from the impact-resistant part, the connecting part is provided with a tenon at the end away from the impact-resistant part, the reinforcing beam is provided with a mortise corresponding to the tenon, and the connecting part and the corresponding reinforcing beam are connected by a mortise and tenon structure in which the tenon is embedded in the mortise.

[0009] Preferably, the number of transverse reinforcing ribs is not less than three, and the transverse reinforcing ribs are evenly distributed; the number of longitudinal reinforcing ribs is not less than three, and the longitudinal reinforcing ribs are evenly distributed.

[0010] Preferably, the reinforcing beam has an L-shaped structure, with two reinforcing beams symmetrically arranged on both sides of the main board.

[0011] Secondly, the present application provides a process for preparing a thermoplastic composite impact-resistant plate as described in the first aspect, comprising the following steps:

[0012] (1) Cutting thermoplastic prepreg to obtain prepreg block A, prepreg block B, prepreg block C, prepreg block D and prepreg block E; wherein, the size of prepreg block A is not less than the size of the impact-resistant part of the main board; the size of prepreg block B is not less than the size of the connecting part of the main board; the size of prepreg block C is not less than the size of the transverse reinforcing rib; the size of prepreg block D is not less than the size of the longitudinal reinforcing rib; and the size of prepreg block E is not less than the size of the reinforcing beam.

[0013] (2) Prepare a motherboard layup mold, and use ultrasonic welding to heat prepreg blocks A, B, C and D; lay prepreg block B on the motherboard layup mold, and complete the thickened layup corresponding to the connection part of the motherboard according to the predetermined layup requirements to obtain preform B; lay prepreg block C on the motherboard layup mold, and complete the thickened layup corresponding to the transverse reinforcing rib according to the predetermined layup requirements to obtain preform C; lay prepreg block D on the motherboard layup mold, and complete the thickened layup corresponding to the longitudinal reinforcing rib according to the predetermined layup requirements to obtain preform D;

[0014] (3) Prepare a reinforcing beam layup mold, use ultrasonic welding to heat the prepreg block E, lay the prepreg block E on the reinforcing beam layup mold, complete the layup corresponding to the reinforcing beam according to the predetermined layup requirements, and obtain the precast body E.

[0015] (4) Prepare the main board forming mold and the reinforcing beam forming mold; use ultrasonic welding to heat the prepreg block A; install the preform C, preform D, preform B and prepreg block A into the mold in sequence, so that the position of preform C in the main board forming mold corresponds to the transverse reinforcing rib, the position of preform D in the main board forming mold corresponds to the longitudinal reinforcing rib, the position of preform B in the main board forming mold corresponds to the connection part of the main board, and the position of prepreg block A in the main board forming mold corresponds to the impact-resistant part of the main board; put the preform E into the reinforcing beam forming mold;

[0016] (5) Place the main board molding mold and the reinforcing beam molding mold after step (4) into a vacuum bag, then heat and mold the vacuum bag, and obtain the main board and reinforcing beam after demolding and cleaning.

[0017] (6) The end of the main board obtained in step (5) is processed to form a tenon, and the end of the reinforcing beam obtained in step (5) is processed to form a mortise. A layer of resistive material is bonded to the surface of the tenon of the main board, and then the tenon is embedded into the mortise of the reinforcing beam to form a tenon and mortise structure. Then the tenon and mortise structure is heated to bond the tenon and the mortise, and a thermoplastic composite impact-resistant plate is obtained.

[0018] Preferably, the resin matrix of the thermoplastic prepreg is selected from at least one of polypropylene resin, polyamide resin, polycarbonate resin, polyethylene resin, polyetheretherketone resin, and polyaryletherketone resin.

[0019] Preferably, the vacuum bag heating and forming specifically includes: heating at a rate of 30-60℃ / h to 250-280℃ and holding for 30 minutes, heating to 340-350℃ and holding for 50 minutes, heating to 380-400℃ and holding for 15 minutes, evacuating to -0.1MPa and holding for another 30 minutes, then cooling to room temperature at a rate of 30-50℃ / h and stopping the vacuuming.

[0020] Preferably, in step (6), the method for heat treatment of the mortise and tenon structure includes any one of ultrasonic welding heat treatment, electric plate heat treatment, and hot air gun heat treatment.

[0021] Preferably, before embedding the tenon into the mortise of the reinforcing beam in step (6), the method further includes: applying thermoplastic resin to the resistive material surface of the tenon.

[0022] Preferably, the size of the tenon is 0.05 to 0.3 mm larger than the corresponding size of the mortise.

[0023] Preferably, in step (1), the length of the prepreg block A is 1.0 to 1.1 times the length of the impact-resistant part, and the width of the prepreg block A is 1.0 to 1.1 times the width of the impact-resistant part; the length of the prepreg B is 1.0 to 1.1 times the length of the connecting part, and the width of the prepreg B is 1.0 to 1.1 times the width of the connecting part; the length of the prepreg block C is 1.0 to 1.1 times the length of the transverse reinforcing rib, and the width of the prepreg block C is 1.0 to 1.1 times the width of the transverse reinforcing rib; the length of the prepreg block D is 1.0 to 1.1 times the length of the longitudinal reinforcing rib, and the width of the prepreg block D is 1.0 to 1.1 times the width of the longitudinal reinforcing rib; the length of the prepreg block E is 1.0 to 1.1 times the length of the reinforcing beam, and the width of the prepreg block E is the sum of the vertical sides of the reinforcing beam.

[0024] The thermoplastic composite impact-resistant plate provided in this application has a mortise and tenon structure. This mortise and tenon connection compensates for the low bonding strength of thermoplastic composites, achieving a balanced load-bearing capacity for the impact-resistant plate. This application employs a method combining an impact-resistant structure with thermoplastic composite materials, using vacuum bag compression molding to produce a thermoplastic impact-resistant plate product with a different structural form from existing impact-resistant plates. Based on the load distribution characteristics of the impact-resistant plate, longitudinal and transverse reinforcing ribs are used for targeted reinforcement, maximizing impact resistance. Attached Figure Description

[0025] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0026] Figure 1 This is a schematic diagram of the structure of the thermoplastic composite impact-resistant plate provided in the embodiments of this application;

[0027] Figure 2 This is a schematic diagram of the layering of the prepreg block provided in the embodiments of this application. Detailed Implementation

[0028] To make the technical solutions and advantages of the embodiments of this application clearer, the exemplary embodiments of this application will be described in further detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not an exhaustive list of all embodiments. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other.

[0029] In the process of developing this application, the inventors discovered that impact resistance plates have high load-bearing requirements and are characterized by diverse loads and large differences in load distribution. No prior art has reported the use of thermoplastic composite materials to prepare impact resistance plates. Due to the low bonding strength of thermoplastic composite materials, if existing impact resistance plate molding processes are used to process thermoplastic composite materials into impact resistance plates with existing structures, the resulting impact resistance plates will exhibit uneven load-bearing capacity.

[0030] To address the aforementioned problems, this application provides a thermoplastic composite impact resistance plate, the structure of which is as follows: Figure 1 As shown.

[0031] The thermoplastic composite impact-resistant plate includes a main plate 1, with reinforcing beams 2 on both sides of the main plate 1. The reinforcing beams are L-shaped and symmetrically arranged on both sides of the main plate. The main plate 1 includes an impact-resistant part 11 and two connecting parts 12, which are symmetrically arranged on both sides of the impact-resistant part 11. The cross-section of the impact-resistant part 11 is wave-shaped, including at least one of circular arc wave, sine wave, cosine wave, triangular wave, and rectangular wave. The impact-resistant part 11 is provided with transverse reinforcing ribs 3 and longitudinal reinforcing ribs 4. The transverse reinforcing ribs 3 extend along the width direction of the impact-resistant part 11, and the longitudinal reinforcing ribs extend along the length direction of the impact-resistant part 11. The thickness of the connecting part 12 gradually increases from the end closer to the impact-resistant part 11 to the end farther away from the impact-resistant part 11. The connecting part 12 is provided with a tenon 13 at the end farther away from the impact-resistant part 11. The reinforcing beam 2 is provided with a mortise and tenon groove that matches the tenon 13. The connecting part 12 and the corresponding reinforcing beam 2 are connected by a mortise and tenon structure in which the tenon 13 is embedded in the mortise and tenon groove.

[0032] There shall be no fewer than three transverse stiffeners 3, which shall be distributed at equal intervals; there shall be no fewer than three longitudinal stiffeners 4, which shall be distributed at equal intervals.

[0033] In this embodiment, the dimensions of the impact-resistant part 11, the connecting part 12, the transverse reinforcing rib 3, the longitudinal reinforcing rib 4, and the reinforcing beam 2 are as follows:

[0034] (1) Impact-resistant part 11: Thickness is 3.0mm, length is 250mm, width is 150.0mm; the cross-section of the impact-resistant part 11 is a circular arc wave structure with an arc radius of 25mm;

[0035] (2) Connecting part 12: 100.0 mm in length, 150.0 mm in width, and thickness gradually increases from 3.0 mm to 10.0 mm;

[0036] (3) Transverse reinforcing rib 3: thickness is 2.0mm, length is 150mm, and width is 4.0mm;

[0037] (4) Longitudinal stiffener 4: thickness is 3.0 mm, length is 250 mm, and width is 4.0 mm;

[0038] (5) Reinforcing beam 2: Thickness is 10.0mm, width is 150.0mm, short vertical side is 80.0mm, and long vertical side is 100.0mm.

[0039] The thermoplastic composite impact-resistant plate provided in this application embodiment is prepared by the following method:

[0040] (1) Cut the thermoplastic prepreg to obtain prepreg blocks A, B, C, D and E; the thermoplastic prepreg is T800 grade carbon fiber prepreg, the thickness of a single layer of prepreg is 0.18-0.20 mm, the matrix resin in the prepreg is polyaryletherketone resin, and the resin content is (34±3)%.

[0041] The shape and dimensions of prepreg block A: rectangular block, with a thickness of 0.18-0.2 mm, a length of 450.0 mm, and a width of 150.0 mm;

[0042] The shape and dimensions of prepreg block B: rectangular block, 100.0 mm in length, 150.0 mm in width, and 0.18–0.2 mm in thickness;

[0043] The shape and dimensions of prepreg block C: rectangular block, with a thickness of 0.18-0.2 mm, a length of 150 mm, and a width of 4.0 mm;

[0044] The shape and dimensions of prepreg block D: rectangular block, with a thickness of 0.18-0.2 mm, a length of 250.0 mm, and a width of 4.0 mm;

[0045] The shape and dimensions of prepreg block E: rectangular block, with a thickness of 0.18-0.2 mm, a length of 200.0 mm, and a width of 150.0 mm.

[0046] (2) Prepare a motherboard layup mold. The motherboard layup mold is made of hard steel and has a length of 500mm, a width of 300mm, and a height of 100mm. Prepreg blocks B, C, and D are heated using ultrasonic welding. Prepreg block B is laid on the motherboard layup mold, and a thickened layup corresponding to the connection portion 12 of the motherboard 1 is completed according to the predetermined layup requirements to obtain preform B. Prepreg block C is laid on the motherboard layup mold, and a thickened layup corresponding to the transverse reinforcing rib 3 is completed according to the predetermined layup requirements to obtain preform C. A schematic diagram after the layup is shown below. Figure 2 As shown, Figure 2 In the diagram, 5 represents preform B, 6 represents preform C, 7 represents the base plate of the main board layup mold, 8 represents the longitudinal baffle of the main board layup mold, and 9 represents the transverse baffle of the main board layup mold. The prepreg block D is laid on the main board layup mold, and the thickened layup corresponding to the longitudinal reinforcing rib 4 is completed according to the predetermined layup requirements to obtain preform D.

[0047] (3) Prepare a reinforcing beam ply mold. The reinforcing beam ply mold is made of hard steel and has a length of 200mm, a width of 180mm, and a height of 100mm. Use ultrasonic welding to heat the prepreg block E, lay the prepreg block E on the reinforcing beam ply mold, and complete the ply corresponding to the reinforcing beam according to the predetermined ply requirements to obtain the precast body E. The parameters for ultrasonic welding heating of each prepreg block are: frequency 28KHz, power 700W, and time 1-2s.

[0048] (4) Prepare the main board forming mold and the reinforcing beam forming mold; use ultrasonic welding to heat the prepreg block A; install the preform C, preform D, preform B and prepreg block A into the mold in sequence, so that the position of preform C in the main board forming mold corresponds to the transverse reinforcing rib 3, the position of preform D in the main board forming mold corresponds to the longitudinal reinforcing rib 4, the position of preform B in the main board forming mold corresponds to the connecting part 12 of the main board 1, and the position of prepreg block A in the main board forming mold corresponds to the impact-resistant part 11 of the main board 1; put the preform E into the reinforcing beam forming mold.

[0049] (5) Place the main board forming mold and the reinforcing beam forming mold into vacuum bags, which are high-temperature resistant polyimide vacuum bags; place the vacuum bag containing the mold into a thermostatic precipitator, heat to 260°C and hold for 30 min, heat to 340°C and hold for 50 min, heat to 380°C and hold for 15 min, evacuate to -0.1 MPa and continue to hold for 30 min, then cool to room temperature and stop evacuating. The heating rate during the heating process is 30-40°C / h, and the cooling rate during the cooling process is 30-40°C / h. After demolding and cleaning, the main board and the reinforcing beam are obtained.

[0050] (6) The end of the main board is processed to form a tenon, and the end of the reinforcing beam is processed to form a mortise. The size of the tenon is 0.15mm larger than the corresponding size of the mortise. The tenon is heated with a hot air gun. After the tenon softens, carbon fiber reinforced polyaryletherketone material is rolled and bonded to the tenon to form a resistive element on the surface of the tenon. Then, polyaryletherketone thermoplastic resin is coated on the surface of the resistive element. The tenon of the main board is pressed into the mortise of the reinforcing beam using a press. The tenon structure is heated for 2 minutes under 80V. The tenon structure is bonded under the action of interference fit stress to obtain a thermoplastic composite impact-resistant plate.

[0051] The above description is merely one example of the present invention. Without departing from the method and principle of the present invention, further details can be found in the appendix. Figure 1 , Figure 2 The molding process technology for derived similar structures should also fall within the scope of protection of this invention.

[0052] The undisclosed content of this invention is common knowledge to those skilled in the art.

[0053] In the description of this application, it should be understood that the terms "upper", "lower", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0054] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0055] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0056] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0057] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A thermoplastic composite impact-resistant panel, characterized in that, The main plate is connected with the reinforcing beams through the mortise and tenon structure. The main plate comprises an impact-resistant part and two connecting parts, and the two connecting parts are symmetrically arranged on the two sides of the impact-resistant part. The thickness of the connecting part gradually increases from one end close to the impact-resistant part to the other end away from the impact-resistant part. The connecting part is provided with a tenon at the end away from the impact-resistant part, and the reinforcing beam is provided with a mortise corresponding to the tenon.

2. The thermoplastic composite impact-resistant panel of claim 1, wherein, The mortise and tenon structure is heated to bond the tenon and the mortise, so that the main plate is connected with the reinforcing beam.

3. A process for the production of a thermoplastic composite impact-resistant panel according to any one of claims 1 to 2, characterized in that, The reinforcing beam is in an L-shaped structure, and the two reinforcing beams are symmetrically arranged on the two sides of the main plate. The method comprises the following steps: (1) cutting thermoplastic prepreg to obtain prepreg blocks A, B, C, D and E; (2) preparing a main plate layering mold, heating the prepreg blocks A, B, C and D by ultrasonic welding, laying the prepreg block B on the main plate layering mold, and completing the thickening layer corresponding to the connecting part of the main plate according to the predetermined layering requirement to obtain a preform B; (3) preparing a reinforcing beam layering mold, heating the prepreg block E by ultrasonic welding, and laying the prepreg block E on the reinforcing beam layering mold to complete the layering corresponding to the reinforcing beam according to the predetermined layering requirement to obtain a preform E; (4) preparing a main plate forming mold and a reinforcing beam forming mold, heating the prepreg block A by ultrasonic welding, and sequentially loading the preforms C, D, B and A into the molds so that the position of the preform C in the main plate forming mold corresponds to the transverse reinforcing rib, the position of the preform D in the main plate forming mold corresponds to the longitudinal reinforcing rib, the position of the preform B in the main plate forming mold corresponds to the connecting part of the main plate, and the position of the prepreg block A in the main plate forming mold corresponds to the impact-resistant part of the main plate; and placing the preform E in the reinforcing beam forming mold. (5) the main plate forming mold and the reinforcing beam forming mold after being put into the vacuum bag in step (4) are heated and formed by vacuum bag, and then the main plate and the reinforcing beam are obtained after demolding and cleaning; (6) the end of the main plate obtained in step (5) is processed to form a tenon, the end of the reinforcing beam obtained in step (5) is processed to form a mortise, a layer of resistance material is bonded on the surface of the tenon, then the tenon is embedded into the mortise to form a mortise-and-tenon structure, and then the mortise-and-tenon structure is heated and treated to bond the tenon and the mortise, thereby obtaining the thermoplastic composite impact-resistant plate.

4. The process for the preparation of a thermoplastic composite panel for impact resistance according to claim 3, characterized in that, The resin matrix of the thermoplastic prepreg is selected from at least one of polypropylene resin, polyamide resin, polycarbonate resin, polyethylene resin, polyether ether ketone resin and polyaryletherketone resin.

5. The process for preparing a thermoplastic composite panel for impact resistance according to claim 3, wherein The vacuum bag heating forming specifically comprises: heating at a temperature increasing rate of 30-60 ℃ / h, holding for 30 min after heating to 250-280 ℃, holding for 50 min after heating to 340-350 ℃, holding for 15 min after heating to 380-400 ℃, continuing to hold for 30 min after vacuumizing to-0.1 MPa, then reducing to room temperature at a temperature decreasing rate of 30-50 ℃ / h, and stopping vacuumizing.

6. The process for preparing a thermoplastic composite panel for impact resistance according to claim 3, wherein In step (6), the method for heating and treating the mortise-and-tenon structure comprises any one of ultrasonic welding heating treatment, electric plate heating treatment and hot air gun heating treatment.

7. The process for preparing a thermoplastic composite panel for impact resistance according to claim 3, wherein Before embedding the tenon into the mortise in step (6), the method further comprises: brushing thermoplastic resin on the surface of the resistance material of the tenon.

8. The process for preparing a thermoplastic composite panel for impact resistance according to claim 3, wherein, The size of the tenon is 0.05-0.3 mm larger than the corresponding size of the mortise.

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