Quantitative test equipment and method for resin wettability of prepreg

Abstract

The invention discloses a quantitative test device and method for the infiltration degree of prepreg resin. The test device comprises a sample test system, and the sample test system is provided with a test cavity, a vacuum interface and a solvent injection port, wherein the vacuum interface and the solvent injection port are communicated with the test cavity; the vacuumizing system is used for vacuumizing the sample testing system and comprises a vacuum meter, a vacuum valve and a vacuum pump which are sequentially connected through a pipeline, and an air inlet of the vacuum meter is in butt joint with the vacuum interface; the infiltration system is used for pumping a solvent into the sample testing system and comprises a peristaltic pump and a solvent box which are sequentially connected through a pipeline, and a liquid outlet of the peristaltic pump is in butt joint with the solvent injection port; and the data acquisition and analysis system analyzes and processes the acquired information through a sensor assembly to obtain evaluation results of the infiltration rate and the infiltration uniformity of the solvent. The testing device is high in testing precision, good in repeatability and high in stability, and the testing method applying the testing device can achieve automatic operation and display testing results in real time.

Description

Technical Field

[0001] The present invention relates to the technical field of composite material testing, and particularly relates to a quantitative testing device and method for the resin impregnation degree of prepreg. Background Art

[0002] As the core intermediate material of composite materials, prepreg is widely used in fields such as aerospace, automotive manufacturing, rail transit, new energy (wind power, hydrogen energy), national defense and military, and sports goods. Its advantages such as light weight, high strength, and corrosion resistance have promoted the lightweight and performance upgrade requirements of various industries. In the aerospace field, it is widely used in manufacturing aircraft wings, fuselages, engine components, and satellite structural components. In the automotive manufacturing field, prepreg is used to produce automotive body structural components, chassis components, interior components, etc. In the energy field, prepreg is widely used in the blades of wind turbines to improve the strength and fatigue resistance of the blades and ensure long-term stable operation in harsh natural environments. The quality of prepreg plays a decisive role in the quality, performance, and reliability of these products, and its quality is directly related to key indicators such as the structural strength, durability, and lightweight degree of the final product. In the field of composite material production, as an important intermediate material, the impregnation degree of prepreg directly affects the performance of composite materials.

[0003] Traditional prepreg impregnation degree detection methods include the capillary effect method, which uses the capillary action of fibers in prepreg to absorb solvents, and evaluates the impregnation degree by measuring the solvent absorption rate or solvent absorption height. The sample size is large, the test time is affected by the solvent absorption rate, there is no unified standard to confirm that the prepreg reaches saturated moisture absorption, and the test results are greatly affected by manual operations. Another traditional prepreg impregnation degree detection method is the bubble method (visual observation), which qualitatively judges the impregnation effect by tearing the prepreg and observing the number of dry fibers or bubbles. It relies on manual experience and has poor quantitative accuracy.

[0004] In recent years, non-destructive testing technologies such as ultrasonic testing and X-ray CT scanning have been added to prepreg impregnation degree detection methods. Ultrasonic testing can quickly screen for delamination and large-size pores and is suitable for on-line detection in production lines. X-ray CT scanning has a micron-level resolution and can accurately display the resin distribution, micro-pores, and fiber agglomeration in three-dimensional images. However, both detection methods require expensive materials and equipment, and there is a lack of a unified impregnation degree quantification standard, which affects the comparability of detection results. Summary of the Invention

[0005] Aiming at the deficiencies in the prior art, the present invention provides a quantitative testing device and method for the resin impregnation degree of prepreg. The testing device has high testing accuracy, good repeatability, and strong stability. The testing method using this testing device can achieve automated operation and display the testing results in real time.

[0006] A quantitative testing device for the resin impregnation degree of prepreg includes

[0007] A sample testing system, wherein the sample testing system comprises a testing chamber and a vacuum interface and a solvent injection port connected to the testing chamber;

[0008] A vacuum pumping system, which is used for vacuum pumping the sample testing system, and includes a vacuum gauge, a vacuum valve and a vacuum pump connected in sequence through a pipeline, and an air inlet of the vacuum gauge is connected to the vacuum interface;

[0009] An infiltration system, the infiltration system is used to pump solvent into the sample testing system, including a peristaltic pump and a solvent tank connected in sequence through a pipeline, and the liquid outlet of the peristaltic pump is connected to the solvent injection port;

[0010] A data acquisition and analysis system analyzes and processes the collected information through a sensor component to obtain evaluation results of the solvent's infiltration rate and infiltration uniformity.

[0011] As a preferred embodiment of the above technical solution, a sample positioning component is provided in the test cavity.

[0012] As a preferred embodiment of the above technical solution, the sample positioning assembly includes a sample fixing frame and an upper cover plate and a lower cover plate arranged above the sample fixing frame, and the upper cover plate and the lower cover plate are used for clamping and positioning the test sample.

[0013] As a preferred embodiment of the above technical solution, the discharge end of the vacuum pump is connected to a test liquid recovery module.

[0014] As a preferred embodiment of the above technical solution, the solvent box has a solvent preheating module built in or externally.

[0015] As a preferred embodiment of the above technical solution, the sensor assembly includes a flow sensor, a pressure sensor, and a weighing sensor.

[0016] The flow sensor is installed in the connecting pipeline between the solvent injection port and the peristaltic pump, and is used to monitor the solvent flow in real time;

[0017] The pressure sensor is installed in the test cavity and is used to monitor the pressure changes in the test cavity in real time during the infiltration process;

[0018] The weighing sensor is located below the test cavity and is used to monitor the weight change of the entire test cavity in real time.

[0019] As a preferred embodiment of the above technical solution, the data acquisition and analysis system also includes an infrared thermal imager, which is used to obtain the distribution of the solvent infiltrating the sample in real time.

[0020] A prepreg resin impregnation quantitative test method is applied to any of the above-mentioned test equipments, and the specific test process is as follows:

[0021] Step 1: Preparation and positioning of the test sample. Cut out a test sample with neat edges and a cross-sectional area of A according to the experimental requirements and the internal space size of the test chamber, measure and obtain the thickness L of the test sample, and install the test sample in the test chamber through the sample positioning component.

[0022] Step 2: Equipment inspection. Ensure that the functions of each system are normal and the connections are unobstructed.

[0023] Step 3: Evacuate the test chamber. Start the vacuum pumping system. When the vacuum gauge shows that the vacuum degree in the test chamber reaches the predetermined value, turn off the vacuum pump and the vacuum valve.

[0024] Step 4: Infiltrate the test sample. Start the infiltration system. According to the characteristics of the prepreg and the experimental requirements, set the flow rate of the peristaltic pump to Q. When the test sample is completely infiltrated and the parameters of the vacuum gauge are stable and unchanged, record the pressure difference △P before and after the vacuum gauge.

[0025] Step 5: Calculate the resin infiltration degree of the prepreg. Confirm the dynamic viscosity μ of the solvent. The data acquisition and analysis system calculates the infiltration degree of the test sample based on the obtained parameter values.

[0026]

[0027] Step 6: Generate visual graphs and tables. The data acquisition and analysis system presents the calculated infiltration degree parameters to the operator in the form of visual graphs and tables, including but not limited to the curve of the infiltration rate changing with time and the distribution map of infiltration uniformity.

[0028] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0029] 1. Using this equipment to quantitatively detect the resin infiltration degree of the prepreg is more accurate, has good repeatability, and strong stability. This equipment works in cooperation with a pressure sensor, a weighing sensor, and a flow sensor to accurately collect the pressure, weight, and flow data during the infiltration process.

[0030] 2. Using this equipment is easy to operate, has high efficiency, strong versatility, and wide application. It realizes automatic operation. The operator only needs to perform simple parameter settings and operation controls on the computer software to complete the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic structural diagram of the test device of the present invention.

[0032] The reference numerals are as follows: 1 - test chamber, 2 - vacuum interface, 3 - solvent injection port, 4 - vacuum gauge, 5 - vacuum valve, 6 - vacuum pump, 7 - peristaltic pump, 8 - solvent tank, 9 - sample positioning assembly, 10 - test liquid recovery module, 11 - solvent preheating module, 12 - flow sensor, 13 - pressure sensor, 14 - weighing sensor, 15 - infrared thermal imager. Detailed implementation manners

[0033] To make the objectives, 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 with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0034] The following further describes the present invention in detail with reference to the accompanying drawings:

[0035] As Figure 1 shown, a prepreg resin infiltration quantification test device includes

[0036] a sample test system, where the sample test system has a test chamber 1 and a vacuum interface 2 and a solvent injection port 3 communicating with the test chamber 1;

[0037] a vacuum pumping system for pumping vacuum for the sample test system, including a vacuum gauge 4, a vacuum valve 5 and a vacuum pump 6 connected in sequence through a pipeline, and the air inlet of the vacuum gauge 4 is docked with the vacuum interface 2;

[0038] an infiltration system for pumping a solvent into the sample test system, including a peristaltic pump 7 and a solvent tank 8 connected in sequence through a pipeline, and the liquid outlet of the peristaltic pump 7 is docked with the solvent injection port 3;

[0039] a data acquisition and analysis system, which analyzes and processes the information collected through a sensor assembly to obtain the infiltration rate of the solvent and the evaluation result of infiltration uniformity.

[0040] In this embodiment, a sample positioning assembly 9 is provided in the test chamber 1.

[0041] In this embodiment, the sample positioning assembly 9 includes a sample fixing frame and an upper cover plate and a lower cover plate arranged above the sample fixing frame, and the upper cover plate and the lower cover plate are used for clamping and positioning the test sample. Specifically, the sample positioning assembly 9 is a conventional structure fixing member, and any structure that meets the positioning of the test sample in this application can be used in this application.

[0042] In this embodiment, the discharge end of the vacuum pump 6 is connected to a test liquid recovery module 11. Specifically, the test liquid recovery module 11 can be a self-weight recovery barrel or an electric recovery barrel.

[0043] In this embodiment, the solvent box 8 is internally or externally provided with a solvent preheating module 11. Specifically, the solvent preheating module 11 can be in the form of an electric heating wire or an electric heater.

[0044] In this embodiment, the sensor assembly includes a flow sensor 12, a pressure sensor 13, and a weighing sensor 14.

[0045] The flow sensor 12 is installed in the connecting pipeline between the solvent injection port 3 and the peristaltic pump 7, and is used to monitor the solvent flow in real time;

[0046] The pressure sensor 13 is installed in the test chamber 1 and is used to monitor the pressure change in the test chamber 1 in real time during the infiltration process;

[0047] The weighing sensor 14 is located below the test cavity 1 and is used to monitor the weight change of the entire test cavity 1 in real time.

[0048] In this embodiment, the data acquisition and analysis system further includes an infrared thermal imager 15, and the infrared thermal imager 15 is used to obtain the distribution of the solvent infiltrating the sample in real time.

[0049] A prepreg resin impregnation quantitative test method is applied to any of the above-mentioned test equipments, and the specific test process is as follows:

[0050] Step 1: Preparation and positioning of the test sample: according to the experimental requirements and the size of the internal space of the test cavity, a test sample with neat edges and a cross-sectional area of ​​A is cut out, and the thickness L of the test sample is measured and obtained. The test sample is installed in the test cavity 1 through the sample positioning component 9;

[0051] It should be noted that the cutting of test samples requires the use of professional cutting tools. During the cutting process, care should be taken to keep the cutting edges neat and avoid burrs or tears to ensure the accuracy of the test results.

[0052] Place the cut prepreg sample on the sample holder to ensure that the position of the sample on the holder is stable and will not be displaced during the subsequent test. The cover design of the sample holder can fix the sample without affecting the flow and infiltration of the solvent. Place the sample holder with the sample fixed steadily into the test chamber 1, taking care to avoid collision with the inner wall of the test chamber 1, and ensure that the sealing inside the test chamber 1 is not affected.

[0053] The surface of the test sample is generally attached with release paper or a PE film. Before removing the release paper or PE film on the surface of the prepreg test sample, use a micrometer to measure the thickness of the specimen and record it as L1. After placing the prepreg, measure the thickness of the release paper or PE film on the surface again and record it as L2. Use L1 - L2 = the thickness L of the prepreg sample.

[0054] Step two, check the device to ensure that the functions of each system are normal and the connections are unobstructed;

[0055] It should be added that the inspection of the device specifically includes the following contents: carefully check whether the connections of each component of the vacuum pumping system and the infiltration system are correct, ensure that the pipeline connections are tight, without looseness or air leakage. Check whether the power supply connections of equipment such as the vacuum pump 6 and the peristaltic pump 7 are normal, and whether there are signs of damage or failure on the appearance of the equipment. Check whether the solvent level in the solvent tank 8 is sufficient. If the solvent level is low, connect an external solvent source through the solvent injection port 3 to fill the solvent tank 8 with solvent;

[0056] Turn on the power switches of equipment such as the vacuum pump 6 and the peristaltic pump 7 for equipment preheating to make the equipment reach the normal working state. At the same time, perform initialization settings on the data acquisition and analysis system, including starting the computer and analysis software, checking whether the communication connections between the software, the data acquisition card, and each sensor are normal, and setting parameters such as the data acquisition frequency and storage path.

[0057] Step three, evacuate the test chamber 1. Start the vacuum pumping system. When the vacuum gauge 4 shows that the vacuum degree in the test chamber 1 reaches the predetermined value, turn off the vacuum pump 6 and the vacuum valve 5;

[0058] It should be added that when evacuating the test chamber 1, the operator needs to closely observe the vacuum gauge 4 installed on the pipeline connecting the test chamber 1 and the vacuum pump 6 to understand the change of the vacuum degree in the test chamber 1 in real time. When the vacuum gauge 4 shows that the vacuum degree in the test chamber 1 reaches the predetermined value, for example, the predetermined value is -0.1 MPa, it means that the test chamber 1 has reached the required vacuum environment. At this time, turn off the vacuum pump 6 and stop the air extraction operation. Then close the vacuum valve 5 to ensure the tightness of the test chamber 1 and prevent external air from entering the test chamber 1, affecting the subsequent infiltration process.

[0059] Step four, infiltrate the test sample. Start the infiltration system. According to the characteristics of the prepreg and the experimental requirements, set the flow rate of the peristaltic pump 7 as Q. When the test sample is completely infiltrated and the parameters of the vacuum gauge 4 are stable and unchanged, record the pressure difference △P before and after the vacuum gauge 4;

[0060] It should be added that before starting the peristaltic pump 7, set the flow rate of the peristaltic pump 7 first. The solvent in the solvent tank 8 slowly flows into the test chamber 1 through the pipeline under the action of the peristaltic pump 7. The flow sensor 12 monitors the solvent flow rate in real time and transmits the flow data to the data acquisition and analysis system.

[0061] During the process of injecting the solvent into the test chamber 1, the pressure sensor 13 is installed inside the test chamber 1 to monitor in real time the pressure change inside the test chamber 1 caused by the filling of the solvent and the possible gas release, and convert the pressure change into an electrical signal for output. The weighing sensor 14 is located below the test chamber 1 to measure in real time the total weight change of the test chamber 1 and the prepreg and solvent inside.

[0062] Step five, calculate the resin impregnation degree of the prepreg, confirm the dynamic viscosity μ of the solvent, and the data acquisition and analysis system calculates the impregnation degree of the test sample according to the obtained parameter values.

[0063]

[0064] Among them, the unit of Q is mm 3 / s, the unit of μ is Pa·s, the unit of L is mm, the unit of A is mm 2 , and the unit of △P is MPa.

[0065] Step six, generate visual graphs and tables, and the data acquisition and analysis system presents the calculated impregnation degree parameters to the operator in the form of visual graphs and tables, including but not limited to the curve of the impregnation rate changing with time and the distribution map of impregnation uniformity.

[0066] It should be added that the pressure sensor 13, the weighing sensor 14, and the flow sensor 12 transmit the data they monitor to the data acquisition card. The data acquisition card converts the analog signals output by the sensors into digital signals and transmits them to the computer. The data analysis software installed on the computer receives these data for real-time display and storage.

[0067] The data analysis software receives the pressure, weight, and flow data transmitted by the data acquisition card and processes these data according to a specific algorithm. By calculating the weight difference at different time points and combining the flow data, the impregnation rate of the solvent is obtained; by analyzing the pressure change curve, the gas release situation during the impregnation of the prepreg is judged, and then the impregnation uniformity is evaluated.

[0068] The software presents the calculated impregnation degree parameters to the operator in the form of visual charts, such as drawing the curve of the impregnation rate changing with time, the distribution map of impregnation uniformity, etc. Through these charts, the operator can more intuitively understand the impregnation situation of the prepreg, which is convenient for evaluating the quality of the prepreg.

[0069] The following are specific embodiments given in this application.

[0070] Sample cutting: Use a cutter to cut the prepreg according to the size of 100mm * 100mm, and the cross-sectional area is 10000mm 2 .

[0071] Sample placement: Place the cut prepreg sample on the sample fixing rack to ensure the stable position of the sample on the fixing rack and prevent displacement during subsequent tests.

[0072] Measuring the sample thickness: Before removing the release paper or PE film on the surface of the prepreg, use a micrometer to measure the sample thickness three times (0.550mm, 0.554mm, 0.552mm), and calculate the average thickness as L1 = 0.552mm; after placing the prepreg, measure the thickness of the released release paper or PE film on the surface three times (0.401mm, 0.400mm, 0.400mm), and calculate the average thickness as L2 = 0.400mm. Use L1 - L2 = the prepreg sample thickness L = 0.152mm.

[0073] Device inspection: Carefully check whether the connections of all components of the vacuum system and the infiltration system are correct to ensure that the pipeline connections are tight without looseness or air leakage. Check whether the water level in the solvent tank 8 is sufficient and turn on the solvent preheating module 11 of the solvent tank 8.

[0074] Preheating and initialization: Turn on the power switches of devices such as the vacuum pump 6 and the peristaltic pump 7 for equipment preheating to make the equipment reach the normal working state. Perform initialization settings on the data acquisition and analysis system, including starting the computer and the analysis software, checking whether the communication connections between the software, the data acquisition card, and each sensor are normal, and setting parameters such as the data acquisition frequency and storage path.

[0075] Start the vacuum pump 6: Open the vacuum valve 5 to ensure the smoothness of the vacuum pipeline. Start the vacuum pump 6, and the vacuum pump 6 starts to work to evacuate the test chamber 1.

[0076] Reach the preset value and close: When the vacuum gauge 4 shows that the vacuum degree in the test chamber 1 reaches the preset value P1 = -0.100MPa, at this time, turn off the vacuum pump 6 and stop the evacuation operation. Then close the vacuum valve 5 to ensure the airtightness of the test chamber 1.

[0077] Set the flow rate of the peristaltic pump 7: According to the characteristics of the prepreg and the experimental requirements, set the flow rate Q = 50mm 3 / s.

[0078] Start the peristaltic pump 7 to inject the solvent: After setting the flow rate, start the peristaltic pump 7, and the solvent in the solvent tank 8 slowly flows into the test chamber 1 through the pipeline under the action of the peristaltic pump 7.

[0079] Sensor Monitoring Data: During the process of injecting the solvent into the test chamber 1, the pressure sensor 13 is installed inside the test chamber 1 to continuously monitor the pressure change inside the test chamber 1 caused by the filling of the solvent and the possible gas release, and convert the pressure change into an electrical signal for output. The weighing sensor 14 is located below the test chamber 1 to continuously measure the total weight change of the test chamber 1, the prepreg, and the solvent inside.

[0080] Based on the solvent distribution captured by the infrared thermal imager 15, the peristaltic pump 7 is paused.

[0081] Record the vacuum degree P2 = -0.105 MPa after infiltration, and calculate the pressure difference △P = 0.005 MPa.

[0082] Data Transmission: The pressure sensor 13, the weighing sensor 14, and the flow sensor 11 transmit the data they monitor to the data acquisition card. The data acquisition card converts the analog signals output by the sensors into digital signals and transmits them to the computer. The data analysis software installed on the computer receives these data for real-time display and storage.

[0083] Data Reception and Processing: The data analysis software receives the pressure, weight, and flow data transmitted by the data acquisition card and processes these data according to specific algorithms. By calculating the weight difference at different time points and combining the flow data, the infiltration rate of the solvent is obtained; by analyzing the pressure change curve, the gas release situation of the prepreg during the infiltration process is judged, and then the uniformity of infiltration is evaluated.

[0084] Calculate the infiltration degree parameter: Confirm that the dynamic viscosity of water μ = 1.01*10 -3 Pa·s, and input the dynamic viscosity parameter.

[0085] Finally, calculate the resin infiltration degree (permeability) of the prepreg as

[0086]

[0087] Remove the sample: After the infiltration process is completed, open the hatch of the test chamber 1 and carefully remove the infiltrated prepreg sample. Note to avoid contacting the sample surface to prevent contamination or damage to the sample.

[0088] Clean the test chamber: Clean the test chamber 1, and use a clean rag or solvent-absorbing paper to remove the residual solvent and impurities inside the test chamber 1. Ensure that the inside of the test chamber 1 is dry and clean to prepare for the next test.

[0089] Reset the device: Turn off the power of devices such as the peristaltic pump 7, the data acquisition and analysis system, etc., and restore the device to its initial state. Check whether each component is in place, such as whether the vacuum valve 5 is closed and whether the solvent level in the solvent tank 8 is appropriate.

[0090] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, various modifications and variations can be made to the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A prepreg resin wettability quantitative testing device, characterized in that: include A sample testing system, wherein the sample testing system comprises a testing chamber and a vacuum interface and a solvent injection port connected to the testing chamber; A vacuum pumping system, which is used for vacuum pumping the sample testing system, and includes a vacuum gauge, a vacuum valve and a vacuum pump connected in sequence through a pipeline, and an air inlet of the vacuum gauge is connected to the vacuum interface; An infiltration system, the infiltration system is used to pump solvent into the sample testing system, including a peristaltic pump and a solvent tank connected in sequence through a pipeline, and the liquid outlet of the peristaltic pump is connected to the solvent injection port; A data acquisition and analysis system analyzes and processes the collected information through a sensor component to obtain evaluation results of the solvent's infiltration rate and infiltration uniformity.

2. A prepreg resin wettability quantification test device according to claim 1, characterized in that: A sample positioning component is arranged in the test cavity.

3. A prepreg resin wettability quantification test device according to claim 2, characterized in that: The sample positioning assembly comprises a sample fixing frame and an upper cover plate and a lower cover plate arranged above the sample fixing frame, wherein the upper cover plate and the lower cover plate are used for clamping and positioning the test sample.

4. A prepreg resin wettability quantification test device according to claim 1, characterized in that: The discharge end of the vacuum pump is connected to a test liquid recovery module.

5. The prepreg resin wettability quantification test equipment according to claim 1, characterized in that: The solvent box is internally or externally provided with a solvent preheating module.

6. A prepreg resin wettability quantification test device according to claim 1, characterized in that: The sensor assembly includes a flow sensor, a pressure sensor, and a weighing sensor. The flow sensor is installed in the connecting pipeline between the solvent injection port and the peristaltic pump, and is used to monitor the solvent flow in real time; The pressure sensor is installed in the test cavity and is used to monitor the pressure changes in the test cavity in real time during the infiltration process; The weighing sensor is located below the test cavity and is used to monitor the weight change of the entire test cavity in real time.

7. A prepreg resin wettability quantification test device according to claim 1, characterized in that: The data acquisition and analysis system also includes an infrared thermal imager, which is used to obtain the distribution of the solvent infiltrating the sample in real time.

8. A method for quantitatively testing the wettability of prepreg resin, characterized in that: Applicable to the test equipment described in any one of claims 1 to 7, the specific test process is as follows: Step 1: Preparation and positioning of the test sample: according to the experimental requirements and the size of the internal space of the test cavity, a test sample with neat edges and a cross-sectional area of ​​A is cut out, and the thickness L of the test sample is measured and obtained. The test sample is installed in the test cavity through a sample positioning component; Step 2: Check the device to ensure that all systems function normally and are connected smoothly; Step 3: evacuate the test chamber, start the vacuum system, and close the vacuum pump and the vacuum valve when the vacuum gauge shows that the vacuum degree in the test chamber reaches a predetermined value; Step 4: Test sample infiltration, start the infiltration system, set the flow rate of the peristaltic pump to Q according to the characteristics of the prepreg and experimental requirements, and record the pressure difference △P before and after the vacuum gauge when the test sample is completely infiltrated and the vacuum gauge parameters are stable; Step 5: Calculate the prepreg resin impregnation degree and confirm the dynamic viscosity μ of the solvent. The data acquisition and analysis system calculates the impregnation degree of the test sample based on the acquired parameter values. Step six, generate visual graphs and tables. The data acquisition and analysis system presents the calculated wettability parameters to the operator in the form of visual graphs and tables, including but not limited to the curve of the wettability rate changing with time and the distribution graph of the wettability uniformity.

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