Textile dynamic composite environment waterproof performance test method and system

Abstract

The application relates to the technical field of measurement, and provides a textile dynamic composite environment waterproof performance test method and system, which comprises the following steps: constructing a dynamic test environment, setting corresponding test parameters; fixing a textile sample on a test platform, applying multiple different forces; monitoring water contact angle, water permeation amount and water repellency duration in real time; obtaining a comprehensive evaluation index according to the monitored water contact angle, water permeation amount and water repellency duration, and evaluating the waterproof performance of the textile according to the comprehensive evaluation index. According to the application, the comprehensive evaluation index is obtained according to the monitored water contact angle, water permeation amount and water repellency duration, the waterproof performance of the textile is evaluated according to the comprehensive evaluation index, the waterproof performance of the textile can be comprehensively measured, the quantifiable comprehensive evaluation of the waterproof performance of the textile in a dynamic composite environment is realized, and the limitation that the test dimension is relatively single in the traditional static test of the waterproof performance of the textile is overcome.

Description

Technical Field

[0001] This invention relates to the field of measurement technology, and more specifically, to a method and system for testing the waterproof performance of textiles in dynamic composite environments. Background Technology

[0002] Functional textiles are gaining an increasingly larger share of the current textile market. Waterproof performance is a crucial indicator for functional textiles and must be measured accurately to ensure that they meet factory specifications and are released into the market. This also guides factories in adjusting their production processes to achieve both consumer satisfaction and smooth factory operations.

[0003] Traditional static tests for the water repellency of textiles include two methods: AATCC 22 (spray method) and ISO 811 (hydrostatic test). AATCC 22 (spray method) is a standard method for testing the water repellency of textiles, assessing the fabric's resistance to wetting through a simulated spray test. ISO 811 (hydrostatic test) specifies a method for determining the water permeability of textiles using hydrostatic pressure. This standard is applicable to all fabrics intended to be water-repellent. It employs a progressive water pressure loading principle, applying continuously increasing water pressure to one side of the sample under standard conditions until a third penetration point appears on the fabric surface.

[0004] Traditional static testing of waterproof performance for textiles has certain limitations. Specifically, AATCC 22 (spray test) only assesses surface wettability and ignores the influence of mechanical stress, while ISO 811 (hydrostatic test) is based on a single hydraulic load and does not consider dynamic water flow impact. In general, traditional static testing of waterproof performance for textiles has relatively limited dimensions and needs improvement and optimization. Summary of the Invention

[0005] To address the limitations of traditional static testing of textile waterproofing performance, which relies on a single testing dimension, and to achieve a quantifiable and comprehensive evaluation of textile waterproofing performance in dynamic composite environments, this invention provides a method and system for testing the waterproofing performance of textiles in dynamic composite environments. The specific technical solution is as follows: A method for testing the waterproof performance of textiles in dynamic composite environments includes the following steps: Build a dynamic testing environment and set the corresponding test parameters; The textile sample is fixed on the test platform and various different forces are applied. Real-time monitoring of water contact angle, water permeability, and water repellency duration; A comprehensive evaluation index is obtained by monitoring the water contact angle, water penetration, and water repellency duration, and the waterproof performance of textiles is evaluated based on the comprehensive evaluation index.

[0006] The proposed method for testing the waterproof performance of textiles in dynamic composite environments simulates a dynamic composite environment by fixing textile samples on a test platform and applying various forces. This allows for the acquisition of multiple waterproof performance indicators across different dimensions of the textile samples. By obtaining a comprehensive evaluation index based on monitoring water contact angle, water penetration, and water repellency duration, and then assessing the waterproof performance of the textiles based on this comprehensive evaluation index, the method can comprehensively measure the waterproof performance of textiles and achieve a quantifiable comprehensive evaluation of the waterproof performance of textiles in dynamic composite environments. This overcomes the limitations of traditional static testing of textile waterproof performance, which has a relatively single testing dimension.

[0007] Preferably, the specific method for setting the corresponding test parameters includes: Simulate the water flow impact pressure gradient of rainwater, the dynamic tensile deformation rate of textile samples, and the surface friction frequency. The water flow impact pressure gradient increases from the initial value at a rate of 0.5 kPa / s to 2 kPa / s, the dynamic tensile deformation rate is controlled to change periodically within the range of 5% to 20%, and the surface friction frequency is 1 Hz to 5 Hz.

[0008] Preferably, the specific methods for fixing the textile sample on the test platform and applying various different forces include: The textile sample is fixed on a test platform used to achieve tensile and frictional actions; The sample surface is positioned at an adjustable angle of 30°-60° with the direction of water jet, and the set water jet impact pressure gradient, dynamic tensile deformation rate and surface friction frequency are applied simultaneously.

[0009] Preferably, specific methods for real-time monitoring of water contact angle, water permeability, and water repellency duration include: Real-time monitoring of the water contact angle on the surface of textile samples during the test and plotting the water contact angle change curve; Real-time monitoring of the cumulative water permeation of textile samples and the duration of surface water repellency during the test; The test is stopped when the cumulative water permeation reaches the preset permeation threshold or the water contact angle drops below the preset contact angle threshold.

[0010] Preferably, the specific method for obtaining the comprehensive evaluation index includes the following steps: Obtain the actual water repellency duration and the baseline duration, and obtain the time dimension term for quantifying the lifetime decay rate of textiles under dynamic stress based on the actual water repellency duration and the baseline duration. Obtain the water contact angle, obtain the average contact angle decay rate, obtain the reference contact angle decay rate, and obtain the contact angle decay term to characterize the surface energy stability based on the average contact angle decay rate and the reference contact angle decay rate. The critical permeability rate and reference permeability rate threshold are obtained based on the water permeability, and the permeability resistance term is obtained based on the critical permeability rate and reference permeability rate threshold to assess the severity of structural integrity collapse. A comprehensive evaluation index model for waterproofing performance is constructed based on the time dimension, contact angle attenuation, and penetration resistance, and a comprehensive evaluation index is obtained based on the comprehensive evaluation index model for waterproofing performance.

[0011] Preferably, the comprehensive evaluation index model for waterproof performance is expressed as follows: ; in, These represent the actual water-repellent duration and the baseline duration, respectively. These represent the average contact angle decay rate and the reference contact angle decay rate, respectively. These represent the critical permeability rate and the reference permeability rate threshold, respectively. These represent the time-weighted coefficient, the attenuation-weighted coefficient, and the impermeability-weighted coefficient, respectively. Indicates the water contact angle. This represents the comprehensive evaluation index.

[0012] A dynamic composite environment waterproof performance testing system for textiles, used to implement the aforementioned dynamic composite environment waterproof performance testing method for textiles, comprising: The test parameter setting module is used to build a dynamic test environment and set the corresponding test parameters; A textile testing platform is used to fix textile samples and apply various different forces. The test parameter monitoring module is used to monitor the water contact angle, water permeability, and water repellency duration in real time. The evaluation index acquisition module is used to obtain a comprehensive evaluation index based on the monitored water contact angle, water penetration, and water repellency duration, and to evaluate the waterproof performance of textiles based on the comprehensive evaluation index.

[0013] Preferably, the test parameter setting module sets the corresponding test parameters by simulating the water flow impact pressure gradient of rainwater, the dynamic tensile deformation rate of textile samples, and the surface friction frequency. The water flow impact pressure gradient increases from the initial value at a rate of 0.5 kPa / s to 2 kPa / s, the dynamic tensile deformation rate is controlled to change periodically within the range of 5% to 20%, and the surface friction frequency is 1 Hz to 5 Hz.

[0014] Preferably, the evaluation index acquisition module includes: The time dimension acquisition unit is used to acquire the actual water repellency duration and the baseline duration, and to acquire the time dimension item used to quantify the life decay rate of textiles under dynamic stress based on the actual water repellency duration and the baseline duration. The contact angle attenuation term acquisition unit is used to acquire the water contact angle, acquire the average contact angle attenuation rate, acquire the reference contact angle attenuation rate, and acquire the contact angle attenuation term used to characterize the surface energy stability based on the average contact angle attenuation rate and the reference contact angle attenuation rate. The permeability resistance term acquisition unit is used to obtain the critical permeability rate and the reference permeability rate threshold based on the water permeability, and to obtain the permeability resistance term used to assess the severity of structural integrity collapse based on the critical permeability rate and the reference permeability rate threshold. The evaluation index model acquisition unit is used to construct a comprehensive evaluation index model for waterproof performance based on the time dimension, contact angle attenuation, and penetration resistance, and to obtain the comprehensive evaluation index based on the comprehensive evaluation index model for waterproof performance.

[0015] Preferably, the evaluation index model acquisition unit obtains the evaluation index model based on the comprehensive evaluation index model of waterproof performance. Obtain the comprehensive evaluation index ; in, These represent the actual water-repellent duration and the baseline duration, respectively. These represent the average contact angle decay rate and the reference contact angle decay rate, respectively. These represent the critical permeability rate and the reference permeability rate threshold, respectively. These represent the time-weighted coefficient, the attenuation-weighted coefficient, and the impermeability-weighted coefficient, respectively. Indicates the water contact angle. Attached Figure Description

[0016] The invention will be further understood from the following description taken in conjunction with the accompanying drawings. The components in the drawings are not necessarily drawn to scale, but rather the emphasis is on illustrating the principles of the embodiments. In different views, the same reference numerals designate corresponding parts.

[0017] Figure 1 This is a schematic diagram of the overall process of a method for testing the waterproof performance of textiles in a dynamic composite environment according to an embodiment of the present invention; Figure 2 This is a flowchart illustrating a specific method for fixing a textile sample on a testing platform and applying various different forces in one embodiment of the present invention. Figure 3 This is a flowchart illustrating a specific method for real-time monitoring of water contact angle, water permeability, and water repellency duration in one embodiment of the present invention. Figure 4 This is a flowchart illustrating a specific method for obtaining a comprehensive evaluation index in one embodiment of the present invention; Figure 5 This is a schematic diagram of the module functional structure of the evaluation index acquisition module in one embodiment of the present invention. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to its embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the scope of protection of the invention.

[0019] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0021] In this invention, "first" and "second" do not represent a specific quantity or order, but are merely used to distinguish names.

[0022] like Figure 1 As shown, an embodiment of the present invention provides a method for testing the waterproof performance of textiles in dynamic composite environments, comprising the following steps: S1, build a dynamic test environment and set the corresponding test parameters.

[0023] Specific methods for setting the corresponding test parameters include simulating the water flow impact pressure gradient, the dynamic tensile deformation rate of the textile sample, and the surface friction frequency. For example, the water flow impact pressure gradient increases from its initial value at a rate of 0.5 kPa / s to 2 kPa / s, the dynamic tensile deformation rate is controlled to change periodically within the range of 5% to 20%, and the surface friction frequency is 1 Hz to 5 Hz. Of course, the test parameters, including the water flow impact pressure gradient, the dynamic tensile deformation rate of the textile sample, and the surface friction frequency, can be appropriately adjusted according to actual needs, and will not be elaborated further here.

[0024] S2 involves fixing the textile sample on the test platform and applying various different forces.

[0025] As a preferred technical solution, such as Figure 2 As shown, specific methods for fixing textile samples on a test platform and applying various different forces include: S21, the textile sample is fixed on a test platform used to achieve tensile and frictional actions.

[0026] S22, so that the sample surface is at an adjustable angle of 30°-60° with the water jet direction, and the set water jet impact pressure gradient, dynamic tensile deformation rate and surface friction frequency are applied simultaneously.

[0027] Specifically, various forces are involved, including water flow impact, tensile deformation, and surface friction. This embodiment constructs a composite stress field by combining water flow impact (hydraulic field), periodic stretching (mechanical deformation field), and surface friction (interfacial shear field) to simulate the real-world scenario of textiles and clothing being subjected to wind stretching, rain erosion, and friction from the body during heavy rain, thereby establishing a dynamic stress synergy mechanism.

[0028] Dynamically correlate test parameters and set tensile deformation rate. With friction frequency The phase coupling relationship between them. For example, the tensile strain rate... Friction frequency .in, These represent the stretch control frequency and phase difference, respectively. The stretch control frequency is 0.1Hz by default, and the phase difference is 90 degrees by default.

[0029] Specifically, 12.5% ​​can be understood as the average deformation rate, corresponding to the median of the typical deformation range of human joint movement, and 7.5% is the deformation fluctuation amplitude. 3Hz is the average friction frequency, i.e., the typical contact frequency between the fabric and skin / equipment, and 2Hz is the friction frequency fluctuation amplitude, mainly simulating the frictional force fluctuation caused by changes in motion acceleration. The core function of the phase difference is to simulate human kinematic characteristics, including increased fabric layer fit and increased frictional contact area but decreased relative slippage during joint flexion, resulting in a lower equivalent friction frequency; and increased fabric surface sliding and frictional tangential velocity during joint extension (minimum stretch rate), resulting in a higher equivalent friction frequency. Friction Frequency Using the tensile frequency as a reference ensures that the two stresses alternate on the same time scale.

[0030] Traditional textile performance testing applies tension and friction independently, neglecting the modulation effect of fabric deformation on the frictional contact area. Furthermore, it typically uses a fixed frequency, failing to reflect the differences in fatigue accumulation caused by variations in motion rhythm. Here, by adjusting the phase difference, the synergistic mechanism of mechanical stress in the actual service environment of textiles and clothing can be accurately simulated.

[0031] S3 monitors the water contact angle, water penetration, and water repellency duration in real time.

[0032] S4, a comprehensive evaluation index is obtained based on the monitored water contact angle, water penetration, and water repellency duration, and the waterproof performance of textiles is evaluated based on the comprehensive evaluation index.

[0033] The proposed method for testing the waterproof performance of textiles in dynamic composite environments simulates a dynamic composite environment by fixing textile samples on a test platform and applying various forces. This allows for the acquisition of multiple waterproof performance indicators across different dimensions of the textile samples. By obtaining a comprehensive evaluation index based on monitoring water contact angle, water penetration, and water repellency duration, and then assessing the waterproof performance of the textiles based on this comprehensive evaluation index, the method can comprehensively measure the waterproof performance of textiles and achieve a quantifiable comprehensive evaluation of the waterproof performance of textiles in dynamic composite environments. This overcomes the limitations of traditional static testing of textile waterproof performance, which has a relatively single testing dimension.

[0034] As a preferred technical solution, such as Figure 3 As shown, specific methods for real-time monitoring of water contact angle, water permeability, and water repellency duration include: S31, monitor the water contact angle of the textile sample surface in real time during the test and plot the water contact angle change curve.

[0035] The water contact angle can be monitored and obtained using a high frame rate contact angle analyzer installed above the textile sample.

[0036] S32, real-time monitoring of the cumulative water penetration of textile samples and the duration of surface water repellency during the test.

[0037] The cumulative water permeation value can be obtained by collecting it through a sealed groove installed under the textile sample.

[0038] S33. When the cumulative water permeation reaches the preset permeation threshold or the water contact angle drops below the preset contact angle threshold, the test is stopped.

[0039] Generally, if the water contact angle decreases to below 90 degrees, it indicates that surface energy failure has led to a change in wettability. If the water penetration exceeds a certain value, such as 5 ml, it reflects the collapse of the overall waterproof layer structure of the textile. The test can be terminated when any one of these conditions is met.

[0040] For example, a contact angle attenuation model is provided herein. .in, Indicates the water pressure gradient. Indicates the friction frequency, The term represents friction loss, and the exponent of 0.5 reflects the sublinear characteristics of wear accumulation, meaning that under high-frequency friction, debris accumulation easily forms a buffer layer. Indicates the tensile deformation rate. These represent the attenuation coefficient and the strain sensitivity coefficient, respectively. The typical value of the attenuation coefficient is 5.2 × 10⁻⁶.-4 Up to 8.7×10 -4 The strain sensitivity coefficient is positively correlated with the coating / base fabric modulus ratio. Both the attenuation coefficient and the strain sensitivity coefficient can be adjusted empirically. Indicates the contact angle.

[0041] This contact angle decay model describes the decay rate of the contact angle θ with time t, reflecting the failure dynamics of hydrophobic coatings / microstructures under hydro-mechanical coupled stress. It can accurately quantify the decay law of surface hydrophobicity under composite stress through multi-physics coupling.

[0042] As a preferred technical solution, such as Figure 4 As shown, the specific method for obtaining the comprehensive evaluation index includes the following steps: S41, obtain the actual water-repellent duration and the baseline duration, and obtain the time dimension term for quantifying the life decay rate of textiles under dynamic stress based on the actual water-repellent duration and the baseline duration.

[0043] The actual water-repellent duration can be understood as the time it takes for a sample to maintain its waterproof function under the combined stress of tension, friction, and water flow impact on a textile. The benchmark duration can be understood as the time it takes for the same material to achieve a 5 mL penetration amount in a standard static test (such as AATCC 22).

[0044] S42, obtain the water contact angle, obtain the average contact angle decay rate, obtain the reference contact angle decay rate, and obtain the contact angle decay term used to characterize the surface energy stability based on the average contact angle decay rate and the reference contact angle decay rate.

[0045] The reference contact angle decay rate is the rate of change of the contact angle of the same material under the impact of pure water flow (without mechanical stress).

[0046] S43, obtain the critical permeability rate and reference permeability rate threshold based on the water permeability, and obtain the permeability resistance term used to assess the severity of structural integrity collapse based on the critical permeability rate and reference permeability rate threshold.

[0047] S44. Construct a comprehensive evaluation index model for waterproof performance based on the time dimension, contact angle attenuation, and penetration resistance, and obtain the comprehensive evaluation index based on the comprehensive evaluation index model for waterproof performance.

[0048] For example, the comprehensive evaluation index model for waterproof performance is expressed as follows: ;in, These represent the actual water-repellent duration and the baseline duration, respectively. These represent the average contact angle decay rate and the reference contact angle decay rate, respectively. These represent the critical permeability rate and the reference permeability rate threshold, respectively. These represent the time-weighted coefficient, the attenuation-weighted coefficient, and the impermeability-weighted coefficient, respectively. Indicates the water contact angle. This represents the comprehensive evaluation index.

[0049] Specifically, the time weighting coefficient reflects the importance of textile durability in the overall evaluation, with a typical range of 0.3-0.6 and a default of 0.4. The time dimension is used to quantify the life decay rate of materials under dynamic stress. The closer the ratio of the actual water-repellent duration to the baseline duration is to 1, the smaller the impact of the dynamic environment on durability. The time weighting coefficient is used to adjust the sensitivity of this item; when it is greater than 1, the weight of the time dimension is strengthened.

[0050] The attenuation weighting coefficient controls the penalty strength for surface characteristic decay on the score, typically ranging from 0.2 to 0.4, with a default of 0.3. The contact angle attenuation term uses an exponential decay form; when the average contact angle attenuation rate equals the reference contact angle attenuation rate, If the attenuation weighting coefficient is 0.3, then the contact angle attenuation term ≈ 0.74; if the average contact angle attenuation rate doubles, then... The penalty increases by approximately 25%. The exponential form enhances sensitivity to rapid decay, which aligns with the abrupt nature of waterproofing failure.

[0051] The critical permeability rate can be understood as the instantaneous permeability rate at the end of the test, while the reference permeability rate threshold is the average rate at which 5 mL of permeate is achieved in a standard hydrostatic test. The permeability resistance weighting coefficient is used to measure the priority of a material's permeability resistance, typically ranging from 0.2 to 0.5, with a default of 0.3. The permeability resistance term is adjusted using a linear proportional and exponential method. When the critical permeability rate is 0 (i.e., no permeation), this term is 1; when the critical permeability rate equals the reference permeability rate threshold, this term is zero, indicating complete failure. The permeability resistance weighting coefficient is used to adjust the curve shape; a value less than 1 weakens the penalty for high permeability, while a value greater than 1 strengthens the penalty for high permeability.

[0052] Specifically, the waterproof performance level of textiles, its explanation, and specific application scenarios can be given based on the comprehensive evaluation index, as shown in the table below:

[0053] This comprehensive evaluation index model for waterproof performance integrates multiple failure mechanisms, including time dimension, contact angle decay, and penetration resistance. The baseline duration, penetration rate threshold, and baseline contact angle decay rate are all derived from static tests of the same material, which can eliminate the influence of differences in the intrinsic properties of the material, allowing the model to focus on evaluating the dynamic stress adaptability of textiles. The time dimension, contact angle decay, and penetration resistance terms are represented by a product structure, and the deterioration of any one of these indicators will lead to a sharp drop in WPI, exhibiting a weak link reinforcement effect.

[0054] In summary, this comprehensive evaluation index model for waterproof performance addresses the shortcomings of traditional single indicators (such as hydrostatic pressure resistance) in reflecting adaptability to complex environments by coupling multi-scale failure mechanisms and dynamic benchmark correction.

[0055] As a preferred technical solution, the test method of the present invention also provides a dynamic waterproof life prediction algorithm for textiles, which is expressed as follows: .in, The initial contact angle is represented and can be obtained by measuring the static droplet method. This represents the real-time contact angle at time t. A dual early warning mechanism is constructed based on the comprehensive evaluation index and the real-time contact angle. For example, when... A red alert may be triggered when the temperature is below 90 degrees Celsius; when A temperature greater than 90 degrees and a WPI less than 0.4 indicates that the coating is intact but the base fabric is cracked; when When the temperature is less than 90 degrees and the WPI is greater than 0.6, it indicates that the textile structure is intact but the coating is chalky.

[0056] In this way, a dual early warning mechanism can be constructed based on the dynamic waterproof life prediction algorithm for textiles and in conjunction with the WPI index. This mechanism can diagnose structural failures and achieve predictable management of waterproof performance throughout the entire process, making the early warning mechanism more reliable.

[0057] An embodiment of the present invention also provides a testing system for the waterproof performance of textiles in dynamic composite environments, used to implement the aforementioned testing method for the waterproof performance of textiles in dynamic composite environments, comprising a test parameter setting module, a textile testing platform, a test parameter monitoring module, and an evaluation index acquisition module.

[0058] The test parameter setting module is used to construct a dynamic test environment and set the corresponding test parameters; the textile test platform is used to fix textile samples and apply various forces; the test parameter monitoring module is used to monitor the water contact angle, water penetration, and water repellency duration in real time; the evaluation index acquisition module is used to obtain a comprehensive evaluation index based on the monitored water contact angle, water penetration, and water repellency duration, and to evaluate the waterproof performance of textiles based on the comprehensive evaluation index.

[0059] For example, the test parameter setting module sets the corresponding test parameters by simulating the water flow impact pressure gradient of rainwater, the dynamic tensile deformation rate of textile samples, and the surface friction frequency; wherein, the water flow impact pressure gradient increases from the initial value at a rate of 0.5kPa / s-2kPa / s, the dynamic tensile deformation rate is controlled to change periodically within the range of 5%-20%, and the surface friction frequency is 1Hz-5Hz.

[0060] The textile testing platform includes a cross slide base for carrying the textile sample to move as a whole along the XY axis, a pitch mechanism (such as a pitch motor) for adjusting the angle between the sample and the water flow, a biaxial tensioning unit for achieving 5%-20% periodic tension of the sample, and a friction execution module for achieving 1-5Hz reciprocating frictional motion via a linear motor.

[0061] Specifically, the biaxial tensile unit includes a tensile clamp that holds the textile sample. A servo motor and ball screw mechanism control the clamp's movement to achieve 5%-20% periodic tensile testing of the sample. The entire biaxial tensile unit can be mounted on a pitch mechanism. By controlling the pitch mechanism, the angle between the sample and the water flow can be adjusted while achieving 5%-20% periodic tensile testing. A nozzle array is positioned above the textile sample, employing a PID closed-loop control method to regulate the water flow pressure gradient, increasing it from its initial value at a rate of 0.5 kPa / s to 2 kPa / s.

[0062] The pitch mechanism can be mounted on a cross slide base, with a sealed groove located below the sample on the cross slide base. A permeate collection balance is used to collect the permeate and measure the water permeation amount. A high-frame-rate contact angle analyzer is placed above the sample to monitor the water contact angle on the textile sample surface. The friction actuator module includes a silicone friction head and a linear motor for driving the reciprocating frictional motion of the silicone friction head. The linear motor can be mounted on the pitch mechanism, and its direction of movement is orthogonal to the stretching direction of the biaxial stretching unit, ensuring that the movements of the biaxial stretching unit and the friction actuator module do not interfere with each other. The silicone friction head contacts the bottom surface of the textile sample. To adjust the frictional force between the friction head and the sample surface, a telescopic mechanism, such as a telescopic motor, can be installed between the linear motor and the pitch mechanism.

[0063] Thus, the textile testing platform solves the technical bottleneck of traditional equipment being unable to simultaneously achieve stretching-friction-fluid loading, enabling a highly realistic dynamic composite testing environment.

[0064] like Figure 5 As shown, the evaluation index acquisition module includes a time dimension acquisition unit, a contact angle attenuation acquisition unit, a penetration resistance acquisition unit, and an evaluation index model acquisition unit.

[0065] The time dimension acquisition unit is used to obtain the actual water-repellent duration and the baseline duration, and to obtain the time dimension for quantifying the life decay rate of textiles under dynamic stress based on the actual water-repellent duration and the baseline duration.

[0066] The contact angle attenuation term acquisition unit is used to acquire the water contact angle, acquire the average contact angle attenuation rate, acquire the reference contact angle attenuation rate, and acquire the contact angle attenuation term used to characterize the surface energy stability based on the average contact angle attenuation rate and the reference contact angle attenuation rate.

[0067] The permeability resistance term acquisition unit is used to obtain the critical permeability rate and the reference permeability rate threshold based on the water permeability, and to obtain the permeability resistance term used to assess the severity of structural integrity collapse based on the critical permeability rate and the reference permeability rate threshold.

[0068] The evaluation index model acquisition unit is used to construct a comprehensive evaluation index model for waterproof performance based on the time dimension, contact angle attenuation, and penetration resistance, and to obtain the comprehensive evaluation index based on the comprehensive evaluation index model for waterproof performance.

[0069] For example, the evaluation index model acquisition unit obtains the evaluation index model based on the comprehensive evaluation index model of waterproof performance. Obtain the comprehensive evaluation index ;in, These represent the actual water-repellent duration and the baseline duration, respectively. These represent the average contact angle decay rate and the reference contact angle decay rate, respectively. These represent the critical permeability rate and the reference permeability rate threshold, respectively. These represent the time-weighted coefficient, the attenuation-weighted coefficient, and the impermeability-weighted coefficient, respectively. Indicates the water contact angle.

[0070] This comprehensive evaluation index model for waterproof performance integrates multiple failure mechanisms, including time dimension, contact angle decay, and penetration resistance. The baseline duration, penetration rate threshold, and baseline contact angle decay rate are all derived from static tests of the same material, which can eliminate the influence of differences in the intrinsic properties of the material, allowing the model to focus on evaluating the dynamic stress adaptability of textiles. The time dimension, contact angle decay, and penetration resistance terms are represented by a product structure, and the deterioration of any one of these indicators will lead to a sharp drop in WPI, exhibiting a weak link reinforcement effect.

[0071] In summary, this comprehensive evaluation index model for waterproof performance addresses the shortcomings of traditional single indicators (such as hydrostatic pressure resistance) in reflecting adaptability to complex environments by coupling multi-scale failure mechanisms and dynamic benchmark correction.

[0072] In summary, the proposed dynamic composite environment waterproof performance testing system for textiles simulates a dynamic composite environment by fixing textile samples on a testing platform and applying various forces, thereby obtaining waterproof performance indicators of textile samples in multiple dimensions. By obtaining a comprehensive evaluation index based on monitoring water contact angle, water penetration, and water repellency duration, and evaluating the waterproof performance of textiles based on the comprehensive evaluation index, the system can comprehensively measure the waterproof performance of textiles and achieve a quantifiable comprehensive evaluation of the waterproof performance of textiles in a dynamic composite environment. This overcomes the limitations of traditional static testing of textile waterproof performance, which has a relatively single testing dimension.

[0073] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0074] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A method for testing the waterproof performance of textiles in dynamic composite environments, characterized in that, The testing method includes the following steps: Build a dynamic testing environment and set the corresponding test parameters; The textile sample is fixed on the test platform and various different forces are applied. Real-time monitoring of water contact angle, water permeability, and water repellency duration; A comprehensive evaluation index is obtained by monitoring the water contact angle, water penetration, and water repellency duration, and the waterproof performance of textiles is evaluated based on the comprehensive evaluation index. The specific methods for setting the corresponding test parameters include: Simulate the water flow impact pressure gradient of rainwater, the dynamic tensile deformation rate of textile samples, and the surface friction frequency. Among them, the water flow impact pressure gradient increases from the initial value at a rate of 0.5kPa / s-2kPa / s, the dynamic tensile deformation rate is controlled to change periodically within the range of 5%-20%, and the surface friction frequency is 1Hz-5Hz. The specific methods for obtaining the comprehensive evaluation index include the following steps: Obtain the actual water-repellent duration and the baseline duration, and obtain the time dimension term for quantifying the lifetime decay rate of textiles under dynamic stress based on the actual water-repellent duration and the baseline duration. Obtain the water contact angle, obtain the average contact angle decay rate, obtain the reference contact angle decay rate, and obtain the contact angle decay term to characterize the surface energy stability based on the average contact angle decay rate and the reference contact angle decay rate. The critical permeability rate and reference permeability rate threshold are obtained based on the water permeability, and the permeability resistance term is obtained based on the critical permeability rate and reference permeability rate threshold to assess the severity of structural integrity collapse. A comprehensive evaluation index model for waterproof performance is constructed based on the time dimension, contact angle attenuation, and penetration resistance, and the comprehensive evaluation index is obtained based on the comprehensive evaluation index model for waterproof performance. The comprehensive evaluation index model for waterproof performance is expressed as follows: ; in, These represent the actual water-repellent duration and the baseline duration, respectively. These represent the average contact angle decay rate and the reference contact angle decay rate, respectively. These represent the critical permeability rate and the reference permeability rate threshold, respectively. These represent the time-weighted coefficient, the attenuation-weighted coefficient, and the impermeability-weighted coefficient, respectively. Indicates the water contact angle. This represents the comprehensive evaluation index.

2. The method for testing the waterproof performance of textiles in dynamic composite environments as described in claim 1, characterized in that, Specific methods for fixing textile samples on a testing platform and applying various different forces include: The textile sample is fixed on a test platform used to achieve tensile and frictional actions; The sample surface is positioned at an adjustable angle of 30°-60° with the direction of water jet, and the set water jet impact pressure gradient, dynamic tensile deformation rate and surface friction frequency are applied simultaneously.

3. The method for testing the waterproof performance of textiles in dynamic composite environments as described in claim 2, characterized in that, Specific methods for real-time monitoring of water contact angle, water permeability, and water repellency duration include: Real-time monitoring of the water contact angle on the surface of textile samples during the test and plotting the water contact angle change curve; Real-time monitoring of the cumulative water permeation of textile samples and the duration of surface water repellency during the test; The test is stopped when the cumulative water permeation reaches the preset permeation threshold or the water contact angle drops below the preset contact angle threshold.

4. A dynamic composite environment waterproof performance testing system for textiles, used to implement the dynamic composite environment waterproof performance testing method for textiles as described in any one of claims 1-3, characterized in that, The testing system includes: The test parameter setting module is used to build a dynamic test environment and set the corresponding test parameters; A textile testing platform is used to fix textile samples and apply various different forces. The test parameter monitoring module is used to monitor the water contact angle, water permeability, and water repellency duration in real time. The evaluation index acquisition module is used to obtain a comprehensive evaluation index based on the monitored water contact angle, water penetration, and water repellency duration, and to evaluate the waterproof performance of textiles based on the comprehensive evaluation index.

5. The dynamic composite environmental waterproof performance testing system for textiles as described in claim 4, characterized in that, The test parameter setting module sets the corresponding test parameters by simulating the water flow impact pressure gradient of rainwater, the dynamic tensile deformation rate of textile samples, and the surface friction frequency. The water flow impact pressure gradient increases from the initial value at a rate of 0.5 kPa / s to 2 kPa / s, the dynamic tensile deformation rate is controlled to change periodically within the range of 5% to 20%, and the surface friction frequency is 1 Hz to 5 Hz.

6. The dynamic composite environmental waterproof performance testing system for textiles as described in claim 5, characterized in that, The evaluation index acquisition module includes: The time dimension acquisition unit is used to acquire the actual water repellency duration and the baseline duration, and to acquire the time dimension item used to quantify the life decay rate of textiles under dynamic stress based on the actual water repellency duration and the baseline duration. The contact angle attenuation term acquisition unit is used to acquire the water contact angle, acquire the average contact angle attenuation rate, acquire the reference contact angle attenuation rate, and acquire the contact angle attenuation term used to characterize the surface energy stability based on the average contact angle attenuation rate and the reference contact angle attenuation rate. The permeability resistance term acquisition unit is used to obtain the critical permeability rate and the reference permeability rate threshold based on the water permeability, and to obtain the permeability resistance term used to assess the severity of structural integrity collapse based on the critical permeability rate and the reference permeability rate threshold. The evaluation index model acquisition unit is used to construct a comprehensive evaluation index model for waterproof performance based on the time dimension, contact angle attenuation, and penetration resistance, and to obtain the comprehensive evaluation index based on the comprehensive evaluation index model for waterproof performance.

7. The dynamic composite environmental waterproof performance testing system for textiles as described in claim 6, characterized in that, The evaluation index model acquisition unit is based on the comprehensive evaluation index model of waterproof performance. Obtain the comprehensive evaluation index ; in, These represent the actual water-repellent duration and the baseline duration, respectively. These represent the average contact angle decay rate and the reference contact angle decay rate, respectively. These represent the critical permeability rate and the reference permeability rate threshold, respectively. These represent the time-weighted coefficient, the attenuation-weighted coefficient, and the impermeability-weighted coefficient, respectively. Indicates the water contact angle.

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