Method for testing tensile strength of thermoplastic prepreg tape

Abstract

The invention discloses a thermoplastic prepreg tape tensile strength testing method, and belongs to the technical field of prepreg tape tensile strength testing, and the thermoplastic prepreg tape tensile strength testing method comprises the following steps: obtaining a narrow-band prepreg tape; clamping the two ends of the narrow-band prepreg tape between two layers of carrier paper through an adhesive to obtain a carrier unit; and respectively testing the carrier units by adopting a universal testing machine, and calculating to obtain the tensile strength, tensile modulus and elongation at break of the corresponding narrow-band prepreg tape. The method has the beneficial effects that the carrier unit is formed by adhering the two ends of the narrow-band prepreg tape to the carrier paper, and the tensile strength, the tensile modulus and the elongation at break of the carrier unit are detected by using the universal testing machine, so that the testing process is simple, data support can be provided for subsequent application of thermoplastic composite materials, and the application range of the narrow-band prepreg tape is widened. And the method has an actual guiding effect on research and development of related equipment and a forming process.

Description

Technical Field

[0001] The invention relates to the technical field of prepreg tape tensile strength testing, and in particular to a thermoplastic prepreg tape tensile strength testing method. Background Art

[0002] In recent years, driven by the demand in the aerospace field and the strong promotion of advanced materials, rocket engines have developed vigorously in the direction of light weight and high strength. Carbon fiber reinforced resin-based composite materials have gradually replaced metal materials and have been widely used due to their excellent properties such as high specific strength and designability. Compared with traditional thermosetting resin-based composite materials, thermoplastic resin-based composite materials have outstanding characteristics such as strong impact resistance, short molding cycle, and recyclability. With the research and development of high-strength and high-toughness thermoplastic polymer materials, the composite molding process has become increasingly developed and improved and has attracted much attention. As an intermediate material directly processed into composite products, thermoplastic prepreg tape has an intuitive understanding of its tensile strength and mastery of high-quality test data, which is of great significance to product reliability and R&D innovation.

[0003] Currently, thermoplastic prepreg tapes are usually used to make unidirectional plates or NOL rings to test their strength. The results are highly dependent on the process and cannot simulate the actual production process of the product.

[0004] In view of this, the inventor conducted in-depth research on this demand, and thus the present case was produced. Summary of the invention

[0005] In view of the problem that the results of the existing technology of testing the strength of thermoplastic prepreg tapes made into unidirectional plates or NOL rings are highly dependent on the process and cannot simulate the actual production process of the product, the present invention takes a different approach and provides a method for testing the tensile strength of thermoplastic prepreg tapes. The preparation and testing of thermoplastic prepreg tape samples are simple and fast, which not only provides data support for the subsequent application of thermoplastic composite materials, but also has a practical guiding role in the research and development of related equipment and molding processes. The specific technical scheme is as follows:

[0006] A method for testing the tensile strength of a thermoplastic prepreg tape comprises the following steps:

[0007] Step S1, obtaining a narrow prepreg tape;

[0008] Step S2, sandwiching the two ends of the narrow prepreg tape between two layers of carrier paper by adhesive to obtain a carrier unit;

[0009] Step S3, using a universal testing machine to test the carrier units respectively, and calculating the tensile strength, tensile modulus and elongation at break of the corresponding narrow strip prepreg tapes.

[0010] It is worth noting that thermoplastic dry winding uses prepreg tape as the intermediate material for direct processing into composite products. In order to adapt to automatic placement equipment and facilitate operation and control, the prepreg tape is usually cut according to a width of 6.35mm. At this time, it is impossible to determine the number of carbon fiber precursors contained in a single prepreg tape, and it is impossible to use traditional methods to measure the carbon fiber strength. It is a common test method for thermoplastic composites to stack multiple layers of prepreg tape to make unidirectional plates or NOL rings to test their mechanical properties, but the results are highly dependent on the manufacturing process.

[0011] Based on the actual production process of the product, which is to use prepreg tape to cyclically lay and wrap layer by layer, the method of directly testing the tensile strength of the single-layer thermoplastic prepreg tape used for laying and wrapping is adopted. The two ends of the narrow prepreg tape are adhered to the carrier paper to form a carrier unit, and the tensile strength, tensile modulus and elongation at break of the carrier unit are tested using a universal testing machine. The testing process is simple, which can not only provide data support for the subsequent application of thermoplastic composite materials, but also has a practical guiding role in the research and development of related equipment and molding technology.

[0012] Here, the carrier paper in step S1 needs to have a certain thickness and hardness to be able to adhere to the adhesive and the narrow prepreg tape, and to facilitate the tensile test of the universal testing machine. Kraft paper or sandpaper is preferably used.

[0013] According to an embodiment of the present application, the tensile properties of the narrow prepreg tapes are tested in groups, and the test results in the group are averaged to obtain relatively accurate test data.

[0014] Specifically, in step S1, a plurality of narrow prepreg tapes are obtained, and the cross-sectional area error of the narrow prepreg tapes is controlled to be within ±0.1 mm;

[0015] The method for preparing the carrier unit in step S2 comprises the following steps:

[0016] Step S21, obtaining two square carrier papers of the same size, and applying adhesive of the same width on one side surface of each of the two opposite edges, wherein the adhesive application width is 40-60 mm;

[0017] Step S22, arranging a plurality of the narrow prepregs along the length direction of the adhesive coating area on the adhesive coating side surface of one of the carrier papers, and then clamping the narrow prepregs with the adhesive coating area of ​​another carrier paper facing downward, so that the adhesive coating areas of the two carrier papers correspond to each other and are pressed tightly, and each of the narrow prepregs is perpendicular to the length direction of the adhesive coating area and both ends pass through the adhesive coating areas located at the opposite edges respectively;

[0018] Step S23, after the adhesive is cured, the carrier paper is cut along the length direction of the adhesive coating area, and the coating area on the carrier paper where the adhesive is not coated is removed to form a plurality of carrier units, and each of the carrier units is sandwiched with a narrow strip prepreg tape.

[0019] More specifically, in step S1, the width of the narrow prepreg tape is 6.35 mm and the length is greater than 250 mm; the narrow prepreg tapes are arranged in groups of 10;

[0020] In step S21, the carrier paper is a rectangle of 250×200 mm, and two carrier papers are scored at a position 50 mm away from the two relatively short edges to form a 50*200 mm coating area on both sides of the carrier paper, and then the adhesive is applied to the coating area; in step S22, the carrier paper is evenly scored in a length direction parallel to the adhesive coating area, and the scoring direction is perpendicular to the length direction of the adhesive coating area, so that the carrier paper is divided into 10 carrier unit areas; 10 narrow prepreg tapes in the group are respectively arranged in the middle position of the upper surface of the 10 carrier unit areas of one of the carrier papers, and then the narrow prepreg tapes are clamped downward with the adhesive coating area of ​​another carrier paper and pressed; in step S23, after the adhesive is cured, the carrier paper is cut at the scored position in the length direction of the adhesive coating area, and the coating area on the carrier paper that is not coated with adhesive is removed to obtain 10 carrier units;

[0021] In step S3, 10 carrier units are tested and the tensile strength, tensile modulus and elongation at break are calculated respectively, and the average values ​​are taken to obtain the average tensile strength, average tensile modulus and average elongation at break of the group of narrow strip prepregs.

[0022] According to another embodiment of the present application, in step S1, a narrow prepreg tape is obtained, and a cross-sectional area error of the narrow prepreg tape is controlled to be within ±0.1 mm; and the narrow prepreg tapes are arranged in groups of 10;

[0023] The method for preparing the carrier unit in step S2 comprises the following steps:

[0024] Step S21, obtaining a 250×400 mm square carrier paper, and applying an adhesive with a width of 40-60 mm on one side surface of the carrier paper near two opposite long edges;

[0025] Step S22, uniformly scoring along the length direction of the carrier paper parallel to the adhesive coating area, and the scoring direction is perpendicular to the length direction of the adhesive coating area, dividing the carrier paper into 10 carrier unit areas and cutting along the scoring direction to obtain 10 carrier unit areas; arranging 10 narrow prepreg tapes in the group on one side of the upper surface of the 10 carrier unit areas close to the middle position, and folding and pressing along the middle position of the carrier unit area;

[0026] Step S23, after the adhesive is cured, the adhesive-free area on the carrier unit area is removed to obtain 10 carrier units;

[0027] In step S3, 10 carrier units are tested and the tensile strength, tensile modulus and elongation at break are calculated respectively, and the average values ​​are taken to obtain the average tensile strength, average tensile modulus and average elongation at break of the group of narrow strip prepregs.

[0028] According to one embodiment of the present application, in step S3, the tensile strength is calculated according to formula (1), and the result is retained to 3 significant figures;

[0029]

[0030] In the formula, σ t is the tensile strength, in MPa; P max is the maximum load that the specimen can withstand before failure, in N; w is the specimen width, in mm; h is the specimen thickness, in mm.

[0031] Preferably, in step S3, the tensile elastic modulus of the sample is calculated according to formula (2) or formula (3), and the result is retained to 3 significant figures;

[0032]

[0033] In the formula, E t is the tensile elastic modulus, in MPa; l is the extensometer gauge length within the specimen working section, in mm; ΔP is the load increment, in N; Δl is the deformation increment within the extensometer gauge length corresponding to ΔP, in mm; Δσ is the tensile stress increment corresponding to ΔP, in MPa; Δε is the strain increment corresponding to ΔP, in mm / mm.

[0034] Preferably, in step S3, the elongation at break is calculated according to formula (4);

[0035]

[0036] In the formula, ε t is the elongation at break, in %.

[0037] According to one embodiment of the present application, the adhesive is CH-31 double-tube adhesive, and the mixing ratio thereof is 1:1. More preferably, the adhesive is cured at room temperature for 24 hours, or at 60±2°C for 5 hours.

[0038] The beneficial effects produced by the technical solution of the present invention are as follows:

[0039] Based on the actual production process of the product, which is to use prepreg tape to cyclically lay and wrap layer by layer, the method of directly testing the tensile strength of the single-layer thermoplastic prepreg tape used for laying and wrapping is adopted. The two ends of the narrow prepreg tape are adhered to the carrier paper to form a carrier unit, and the tensile strength, tensile modulus and elongation at break of the carrier unit are tested using a universal testing machine. The testing process is simple, which can not only provide data support for the subsequent application of thermoplastic composite materials, but also has a practical guiding role in the research and development of related equipment and molding technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0041] Figure 1 This is a flow chart of a preferred thermoplastic prepreg tensile strength test process of the present invention;

[0042] Figure 2 is a diagram showing the relationship between the glue coating, folding line and the position of the carrier paper and the narrow prepreg tape in a preferred embodiment of the present invention;

[0043] Figure 3 is a diagram showing the arrangement position relationship of the narrow prepreg tape before folding in the carrier unit area in another preferred embodiment of the present invention;

[0044] Figure 4 It is a schematic diagram of a preferred carrier unit layer structure of the present invention. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but only represents selected embodiments of the present invention.

[0046] Thermoplastic dry winding uses prepreg tape as the intermediate material for direct processing into composite products. In order to adapt to automatic placement equipment and facilitate operation and control, the prepreg tape is usually cut according to a width of 6.35mm. At this time, it is impossible to determine the number of carbon fiber precursors contained in a single prepreg tape, and it is impossible to use traditional methods to measure the carbon fiber strength. It is a common test method for thermoplastic composite materials to stack multiple layers of prepreg tape to make unidirectional plates or NOL rings to test their mechanical properties, but the results are highly dependent on the manufacturing process.

[0047] Based on the fact that the actual production process of the product is to use prepreg tapes to lay and wrap layer by layer, this application takes a different approach and adopts a method to directly test the tensile strength of a single layer of thermoplastic prepreg tape used for laying and wrapping. For details, see Figure 1 and 4 , including the following steps:

[0048] Step S1, obtaining a narrow strip prepreg tape 1;

[0049] Step S2, the two ends of the narrow prepreg tape 1 are sandwiched between two layers of carrier paper 2 by adhesive 3 to obtain a carrier unit 4, see Figure 4 ;

[0050] Step S3, using a universal testing machine to test the carrier units respectively, and calculating the tensile strength, tensile modulus and elongation at break of the corresponding narrow strip prepreg tapes.

[0051] A carrier unit is formed by adhering the two ends of a narrow prepreg tape to a carrier paper, and a universal testing machine is used to test the tensile strength, tensile modulus, and elongation at break of the carrier unit. The test process is simple and can not only provide data support for the subsequent application of thermoplastic composite materials, but also has a practical guiding role in the research and development of related equipment and molding processes.

[0052] Here, the carrier paper in step S1 needs to have a certain thickness and hardness to be able to adhere to the adhesive and the narrow prepreg tape, and to facilitate the tensile test of the universal testing machine. Kraft paper or sandpaper is preferably used.

[0053] As an embodiment of the present application, the tensile properties of the narrow prepreg tapes are tested in groups, and the test results in the group are averaged to obtain relatively accurate test data.

[0054] Specifically, in step S1, a plurality of narrow prepreg tapes are obtained, and the cross-sectional area error of the narrow prepreg tapes is controlled to be within ±0.1 mm;

[0055] The method for preparing the carrier unit in step S2 comprises the following steps:

[0056] Step S21, obtaining two square carrier papers 2 of the same size, and applying adhesive 3 of the same width on one side surface of each of the two opposite edges, wherein the adhesive application width is 40-60 mm;

[0057] Step S22, arranging a plurality of the narrow prepreg tapes 1 along the length direction of the adhesive 3 coating area on the adhesive coating side surface of one of the carrier papers 2, such as Figure 2 As shown; the narrow prepreg tape is clamped with another sheet of the carrier paper with the adhesive coating area facing downward, so that the adhesive coating areas of the two carrier papers correspond to each other and are pressed tightly, and each of the narrow prepreg tapes is perpendicular to the length direction of the adhesive coating area and the two ends pass through the adhesive coating areas located at the opposite edges respectively;

[0058] Step S23, after the adhesive is cured, the carrier paper is cut along the length direction of the adhesive coating area, and the coating area on the carrier paper where the adhesive is not coated is removed to form a plurality of carrier units, and each of the carrier units is sandwiched with a narrow strip prepreg tape.

[0059] More specifically, in step S1, the width of the narrow prepreg tape is 6.35 mm and the length is greater than 250 mm; the narrow prepreg tapes are arranged in groups of 10;

[0060] In step S21, the carrier paper is a rectangle of 250×200 mm, and two carrier papers are scored at a position 50 mm away from the two relatively short edges to form a 50*200 mm coating area located on both sides of the carrier paper, and then the adhesive 3 is coated in the coating area; in step S22, the carrier paper is evenly scored along the length direction parallel to the adhesive coating area, and the direction of the score 21 is perpendicular to the length direction of the adhesive 3 coating area, so that the carrier paper 2 is divided into 10 carrier unit areas 22; the 10 narrow prepreg tapes 1 in the group are respectively arranged in the middle position of the upper surface of the 10 carrier unit areas 22 of the carrier paper 2, such as Figure 2 As shown; the narrow prepreg tape is clamped and pressed with another sheet of the carrier paper with the adhesive coating area facing downward; in step S23, after the adhesive is cured, the carrier paper is cut along the line position in the length direction of the adhesive coating area, and the coating area on the carrier paper where the adhesive is not coated is removed to obtain 10 carrier units;

[0061] In step S3, 10 carrier units are tested and the tensile strength, tensile modulus and elongation at break are calculated respectively, and the average values ​​are taken to obtain the average tensile strength, average tensile modulus and average elongation at break of the group of narrow strip prepregs.

[0062] As another embodiment of the present application, in step S1, a narrow prepreg tape is obtained, and the cross-sectional area error of the narrow prepreg tape is controlled to be within ±0.1 mm; and the narrow prepreg tapes are arranged in groups of 10;

[0063] The method for preparing the carrier unit in step S2 comprises the following steps:

[0064] Step S21, obtaining a 250×400 mm square carrier paper, and applying an adhesive 3 with a width of 40-60 mm on one side surface of the carrier paper near two opposite long edges;

[0065] Step S22, uniformly draw lines along the length direction of the carrier paper 2 parallel to the adhesive 3 coating area, and the drawing direction is perpendicular to the length direction of the adhesive 3 coating area, and the carrier paper 2 is divided into 10 carrier unit areas 22 and cut along the drawing direction to obtain 10 carrier unit areas 22; the 10 narrow prepreg tapes 1 in the group are respectively arranged on one side of the upper surface of the 10 carrier unit areas 22 close to the middle position, see Figure 3 , and fold and press along the middle position of the carrier unit area 22;

[0066] Step S23, after the adhesive is cured, the adhesive-free area on the carrier unit area is removed to obtain 10 carrier units;

[0067] In step S3, 10 carrier units are tested and the tensile strength, tensile modulus and elongation at break are calculated respectively, and the average values ​​are taken to obtain the average tensile strength, average tensile modulus and average elongation at break of the group of narrow strip prepregs.

[0068] According to one embodiment of the present application, in step S3, the tensile strength is calculated according to formula (1), and the result is retained to 3 significant figures;

[0069]

[0070] In the formula, σ t is the tensile strength, in MPa; P max is the maximum load that the specimen can withstand before failure, in N; w is the specimen width, in mm; h is the specimen thickness, in mm.

[0071] Preferably, in step S3, the tensile elastic modulus of the sample is calculated according to formula (2) or formula (3), and the result is retained to 3 significant figures;

[0072]

[0073] In the formula, E tis the tensile elastic modulus, in MPa; l is the extensometer gauge length within the specimen working section, in mm; ΔP is the load increment, in N; Δl is the deformation increment within the extensometer gauge length corresponding to ΔP, in mm; Δσ is the tensile stress increment corresponding to ΔP, in MPa; Δε is the strain increment corresponding to ΔP, in mm / mm.

[0074] Preferably, in step S3, the elongation at break is calculated according to formula (4);

[0075]

[0076] In the formula, ε t is the elongation at break, in %.

[0077] According to one embodiment of the present application, the adhesive is CH-31 double-tube adhesive, and the mixing ratio thereof is 1:1. More preferably, the adhesive is cured at room temperature for 24 hours, or at 60±2°C for 5 hours.

[0078] According to the comparison of calculation results, the strength data obtained by using the above two prepreg tapes is not much different from the data obtained by using the one-way board test, but this method is simpler and easier to operate.

[0079] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for testing the tensile strength of a thermoplastic prepreg, characterized in that: The steps include: Step S1, obtaining a narrow prepreg tape; Step S2, sandwiching the two ends of the narrow prepreg tape between two layers of carrier paper by adhesive to obtain a carrier unit; Step S3, using a universal testing machine to test the carrier units respectively, and calculating the tensile strength, tensile modulus and elongation at break of the corresponding narrow strip prepreg tapes.

2. The method for testing the tensile strength of thermoplastic prepreg according to claim 1, characterized in that: In step S2, the carrier paper is kraft paper or sandpaper.

3. The method for testing the tensile strength of thermoplastic prepreg according to claim 1, characterized in that: In step S1, a plurality of narrow prepreg tapes are obtained, and the cross-sectional area error of the narrow prepreg tapes is controlled to be within ±0.1 mm; The method for preparing the carrier unit in step S2 comprises the following steps: Step S21, obtaining two square carrier papers of the same size, and applying adhesive of the same width on one side surface of each of the two opposite edges, wherein the adhesive application width is 40-60 mm; Step S22, arranging a plurality of the narrow prepregs along the length direction of the adhesive coating area on the adhesive coating side surface of one of the carrier papers, and then clamping the narrow prepregs with the adhesive coating area of ​​another carrier paper facing downward, so that the adhesive coating areas of the two carrier papers correspond to each other and are pressed tightly, and each of the narrow prepregs is perpendicular to the length direction of the adhesive coating area and both ends pass through the adhesive coating areas located at the opposite edges respectively; Step S23, after the adhesive is cured, the carrier paper is cut along the length direction of the adhesive coating area, and the coating area on the carrier paper where the adhesive is not coated is removed to form a plurality of carrier units, and each of the carrier units is sandwiched with a narrow strip prepreg tape.

4. The method for testing the tensile strength of thermoplastic prepreg according to claim 3, characterized in that: In step S1, the width of the narrow prepreg tape is 6.35 mm and the length is greater than 250 mm; the narrow prepreg tapes are arranged in groups of 10; In step S21, the carrier paper is a rectangle of 250×200 mm, and two carrier papers are scored at a position 50 mm away from the two relatively short edges to form a 50*200 mm coating area on both sides of the carrier paper, and then the adhesive is applied to the coating area; in step S22, the carrier paper is evenly scored in a length direction parallel to the adhesive coating area, and the scoring direction is perpendicular to the length direction of the adhesive coating area, so that the carrier paper is divided into 10 carrier unit areas; 10 narrow prepreg tapes in the group are respectively arranged in the middle position of the upper surface of the 10 carrier unit areas of one of the carrier papers, and then the narrow prepreg tapes are clamped downward with the adhesive coating area of ​​another carrier paper and pressed; in step S23, after the adhesive is cured, the carrier paper is cut at the scored position in the length direction of the adhesive coating area, and the coating area on the carrier paper that is not coated with adhesive is removed to obtain 10 carrier units; In step S3, 10 carrier units are tested and the tensile strength, tensile modulus and elongation at break are calculated respectively, and the average values ​​are taken to obtain the average tensile strength, average tensile modulus and average elongation at break of the group of narrow strip prepregs.

5. The method for testing the tensile strength of thermoplastic prepreg according to claim 1, characterized in that: In step S1, a narrow prepreg tape is obtained, and the cross-sectional area error of the narrow prepreg tape is controlled within ±0.1 mm; the narrow prepreg tapes are arranged in groups of 10; The method for preparing the carrier unit in step S2 comprises the following steps: Step S21, obtaining a 250×400 mm square carrier paper, and applying an adhesive with a width of 40-60 mm on one side surface of the carrier paper near two opposite long edges; Step S22, uniformly scoring along the length direction of the carrier paper parallel to the adhesive coating area, and the scoring direction is perpendicular to the length direction of the adhesive coating area, dividing the carrier paper into 10 carrier unit areas and cutting along the scoring direction to obtain 10 carrier unit areas; arranging 10 narrow prepreg tapes in the group on one side of the upper surface of the 10 carrier unit areas close to the middle position, and folding and pressing along the middle position of the carrier unit area; Step S23, after the adhesive is cured, the adhesive-free area on the carrier unit area is removed to obtain 10 carrier units; In step S3, 10 carrier units are tested and the tensile strength, tensile modulus and elongation at break are calculated respectively, and the average values ​​are taken to obtain the average tensile strength, average tensile modulus and average elongation at break of the group of narrow strip prepregs.

6. The method for testing the tensile strength of thermoplastic prepreg according to claim 1, characterized in that: In step S3, the tensile strength is calculated according to formula (1), and the result is retained to 3 significant figures; In the formula, σ t is the tensile strength, in MPa; P max is the maximum load that the specimen can withstand before failure, in N; w is the specimen width, in mm; h is the specimen thickness, in mm.

7. The method for testing the tensile strength of thermoplastic prepreg according to claim 6, characterized in that: In step S3, the tensile elastic modulus of the sample is calculated according to formula (2) or formula (3), and the result is retained to 3 significant figures; In the formula, E t is the tensile elastic modulus, in MPa; l is the extensometer gauge length in the working section of the specimen, in mm; ΔP is the load increment, in N; Δl is the deformation increment within the extensometer gauge length corresponding to ΔP, in mm; Δσ is the tensile stress increment corresponding to ΔP, in MPa; Δε is the strain increment corresponding to ΔP, in mm / mm.

8. The method for testing the tensile strength of thermoplastic prepreg according to claim 7, characterized in that: In step S3, the elongation at break is calculated according to formula (4); In the formula, ε t is the elongation at break, in %.

9. The method for testing the tensile strength of thermoplastic prepreg according to claim 1, characterized in that: The adhesive is CH-31 double-tube adhesive, and the mixing ratio is 1:

1.

10. The method for testing the tensile strength of a thermoplastic prepreg according to any one of claims 3 to 9, characterized in that: The adhesive is cured at room temperature for 24 hours, or at 60±2℃ for 5 hours.

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