A method and system for detecting the aging degree of a waterproof layer of a coiled material

Abstract

The application discloses a kind of aging degree detection method and system of waterproof layer of coiled material, it is related to waterproof material detection: the infrared absorption spectrum of the surface of TPO waterproof coiled material or TPO waterproof layer to be measured is collected;The peak area of first characteristic peak, second characteristic peak, third characteristic peak and reference peak is extracted;Determine first functional group index, second functional group index and third functional group index;Third functional group index is compared with preset path determination threshold value: when third functional group index is greater than preset path determination threshold value, determine the first aging path type corresponding to the TPO waterproof coiled material or TPO waterproof layer to be measured;When third functional group index is less than or equal to preset path determination threshold value, and at least one of first functional group index and second functional group index is greater than corresponding preset oxidation threshold value, determine the second aging path type corresponding to the TPO waterproof coiled material or TPO waterproof layer to be measured;The application solves the problem that single peak is inaccurate under different aging modes.

Description

Technical Field

[0001] This application relates to the field of waterproof material testing, and in particular to a method and system for testing the aging degree of a roll waterproof layer. Background Technology

[0002] Thermoplastic polyolefin (TPO) waterproof membranes are widely used in building roofing and underground waterproofing projects due to their good weather resistance, mechanical properties, processability, and recyclability. However, during actual service, TPO waterproof membranes or the waterproof layers they form are subject to the combined effects of solar radiation, heat, oxygen, moisture, and external environmental stresses. Their molecular structure and macroscopic mechanical properties gradually change over time, leading to a decline in waterproofing performance and, in severe cases, failure of the waterproof layer.

[0003] For TPO waterproof membranes or waterproof layers that have already been laid and used, destructive sampling methods to assess their aging are not only inefficient but also compromise the integrity of the waterproof layer. Therefore, non-destructive testing methods based on infrared absorption spectroscopy have gradually become an important technical approach for aging assessment of TPO waterproof membranes. These methods typically collect the infrared absorption spectrum of the material surface, extract absorption peak information at specific wavenumbers, and use the intensity, area, or ratio of a characteristic peak as aging characterization parameters to infer the degree of oxidation or performance degradation of the material.

[0004] However, existing infrared nondestructive testing methods typically use a single infrared characteristic peak to characterize the aging degree of TPO waterproof membranes, assuming a stable correlation between this characteristic peak and material performance degradation under different aging conditions. The inventors' research has found that this assumption does not always hold true in the actual aging process of TPO waterproof membranes. The oxidative degradation process of TPO waterproof membranes varies significantly under different irradiation aging conditions. Different aging conditions may trigger different oxidation reactions, chain scission reactions, cross-linking reactions, and specific functional group formation behaviors on the surface and inside, resulting in inconsistent trends in the changes of multiple characteristic peaks in the infrared spectrum and their correlation with mechanical property degradation.

[0005] For example, under different artificially accelerated aging conditions, TPO waterproof membranes may exhibit different aging pathways: in some aging modes, the changes in absorption peaks related to specific oxygen-containing functional groups are more significant; while in other aging modes, changes in absorption peaks related to unsaturated bonds or other oxidation products better reflect the performance degradation process. Therefore, the ability of the same infrared characteristic peak to characterize the degree of aging under different aging modes has a clear mode dependence. If a single characteristic peak is still used as a unified evaluation index, it is easy for it to have a good correlation under one aging mode but a deviation under another, thus leading to inaccurate judgments on the actual aging degree and remaining performance of the TPO waterproof membrane or waterproof layer.

[0006] Especially for TPO waterproof membranes or waterproof layers already in service, the temperature, ultraviolet radiation intensity, radiation spectral composition, and thermo-oxidative coupling conditions in their environment can vary significantly, resulting in a non-uniform aging path for the material. Current technologies do not fully consider the impact of differences in oxidative degradation paths under different irradiation aging conditions on infrared detection results, and lack a non-destructive assessment method capable of identifying different aging paths and employing corresponding evaluation mechanisms. Consequently, it is difficult to reliably reflect the actual performance degradation degree of waterproof membranes or waterproof layers. This affects the assessment of the service status of waterproof layers, the determination of maintenance timing, and life-cycle management, potentially leading to delayed waterproof layer maintenance, increased leakage risk, and greater economic losses.

[0007] Therefore, there is an urgent need to provide a non-destructive evaluation method and system for detecting the aging degree of TPO waterproof membranes or TPO waterproof layers, in order to solve the technical problems in the existing technology that do not distinguish between different aging paths, are easily affected by aging modes by a single infrared characteristic peak index, and are difficult to stably characterize the actual performance degradation degree. Summary of the Invention

[0008] Existing infrared nondestructive testing methods do not consider the differences in the oxidative degradation pathways of TPO waterproof membranes under different irradiation aging conditions. This results in a pattern-dependent characterization of the degree of aging by a single infrared characteristic peak, making it difficult to stably reflect the actual performance degradation of the waterproof membrane or waterproof layer. This application addresses the pattern-dependent error caused by different aging pathways by constructing a multi-peak synergistic / sub-mode judgment mechanism to solve the problem of inaccuracy of a single peak under different aging modes.

[0009] One aspect of this application provides a method for testing the aging degree of a rolled waterproofing layer, used to test TPO waterproofing membranes or TPO waterproofing layers, including:

[0010] Collect the infrared absorption spectrum of the surface of the TPO waterproof membrane or TPO waterproof layer to be tested;

[0011] Extraction based on infrared absorption spectrum At the first characteristic peak, The second characteristic peak, The third characteristic peak and The peak area of ​​the reference peak;

[0012] The first functional group index is determined by the ratio of the peak area of ​​the first characteristic peak to the peak area of ​​the reference peak; the second functional group index is determined by the ratio of the peak area of ​​the second characteristic peak to the peak area of ​​the reference peak; and the third functional group index is determined by the ratio of the peak area of ​​the third characteristic peak to the peak area of ​​the reference peak.

[0013] The third functional group index is compared with the preset path determination threshold:

[0014] When the index of the third functional group is greater than the preset path determination threshold, the first aging path type corresponding to the TPO waterproof membrane or TPO waterproof layer to be tested is determined.

[0015] When the third functional group index is less than or equal to the preset path determination threshold, and at least one of the first functional group index and the second functional group index is greater than the corresponding preset oxidation threshold, the second aging path type corresponding to the TPO waterproof membrane or TPO waterproof layer to be tested is determined.

[0016] Read the target evaluation rule corresponding to the aging path type from the pre-stored aging evaluation rules;

[0017] Based on the target evaluation rules read, as well as the first functional group index, the second functional group index, and the third functional group index, the aging degree level of the TPO waterproof membrane or TPO waterproof layer to be tested is obtained.

[0018] Furthermore, attenuated total reflection Fourier transform infrared spectroscopy was used to acquire infrared absorption spectra;

[0019] Furthermore, the first functional group index is calculated using the following formula: ;

[0020] The second functional group index is calculated using the following formula: ;

[0021] The third functional group index is calculated using the following formula: ;

[0022] in, express The peak area of ​​the first characteristic peak. express The peak area of ​​the second characteristic peak. express The peak area of ​​the third characteristic peak. express The peak area of ​​the reference peak;

[0023] Furthermore, when it is determined that the TPO waterproof membrane or TPO waterproof layer to be tested corresponds to the first aging path type, the target evaluation rule is: to use the third functional group index as the main judgment index, and to use the first functional group index and the second functional group index as additional judgment indices to determine the aging level.

[0024] When it is determined that the TPO waterproof membrane or TPO waterproof layer to be tested corresponds to the second aging path type, the target evaluation rule is: to use at least one of the first functional group index and the second functional group index as the main judgment index to determine the aging degree level.

[0025] Furthermore, when the target evaluation rule uses the third functional group index as the main criterion:

[0026] The third functional group index is matched with the third index level threshold range, and the first intermediate level is determined based on the matching result.

[0027] Then, at least one of the first functional group index and the second functional group index is compared with an additional verification threshold;

[0028] When the additional verification results meet the preset correction rules, the first intermediate level is adjusted to obtain the aging level.

[0029] Furthermore, when the target evaluation rule uses at least one of the first functional group index and the second functional group index as the main criterion:

[0030] The first functional group index is matched with the first index level threshold range, and / or the second functional group index is matched with the second index level threshold range to obtain the second intermediate level.

[0031] When the first functional group index and the second functional group index correspond to different intermediate levels, the higher aging level is selected as the aging degree level.

[0032] Furthermore, the aging level levels include any one of the following: Level 1 aging, Level 2 aging, Level 3 aging, and Level 4 aging.

[0033] Furthermore, the pre-stored aging evaluation rules are determined through the pre-established correspondence between functional group index intervals and tensile stress retention rate intervals;

[0034] The correspondence between the functional group index range and the tensile stress retention rate range includes at least the following:

[0035] Tensile stress retention rate greater than or equal to the first set value corresponds to Level 1 aging;

[0036] A tensile stress retention rate that is less than the first set value and greater than or equal to the second set value corresponds to a level 2 or level 3 aging process.

[0037] A tensile stress retention rate less than the second set value corresponds to Level 4 aging.

[0038] The first setting value is greater than the second setting value;

[0039] Furthermore, the range of the first set value is 70% to 80%;

[0040] The second set value is in the range of 60% to 70%;

[0041] Another aspect of this application provides a method for testing the aging degree of a roll waterproofing layer, used to test TPO waterproofing rolls or TPO waterproofing layers, including:

[0042] The infrared spectroscopy acquisition module is used to acquire the infrared absorption spectrum of the surface of the TPO waterproof membrane or TPO waterproof layer to be tested.

[0043] The feature extraction module is used to extract features based on the infrared absorption spectrum. At the first characteristic peak, The second characteristic peak, The third characteristic peak and The peak area of ​​the reference peak;

[0044] The index calculation module is used to determine the first functional group index based on the ratio of the peak area of ​​the first characteristic peak to the peak area of ​​the reference peak, the second functional group index based on the ratio of the peak area of ​​the second characteristic peak to the peak area of ​​the reference peak, and the third functional group index based on the ratio of the peak area of ​​the third characteristic peak to the peak area of ​​the reference peak.

[0045] The path determination module is used to compare the third functional group index with the preset path determination threshold, and determine the first aging path type when the third functional group index is greater than the preset path determination threshold, and determine the second aging path type when the third functional group index is not greater than the preset path determination threshold and at least one of the first functional group index and the second functional group index is greater than the corresponding preset oxidation threshold.

[0046] The evaluation module is used to read the target evaluation rule corresponding to the aging path type from the pre-stored aging evaluation rules according to the aging path type determined by the path determination module, and input the first functional group index, the second functional group index and the third functional group index into the target evaluation rule to obtain the aging degree level of the TPO waterproof membrane or TPO waterproof layer to be tested.

[0047] Compared to existing technologies, the advantages of this application are:

[0048] This application extracts multiple infrared characteristic peaks simultaneously and constructs first, second, and third functional group indices respectively. First, based on the correlation between these indices, the aging path type of the TPO waterproof membrane or TPO waterproof layer under test is determined. Then, according to the determined aging path type, the corresponding aging evaluation rules are invoked for graded assessment, forming a continuously coupled evaluation chain of infrared spectral feature extraction, aging path identification, and aging degree determination. Since the oxidative degradation behavior of TPO materials differs under different irradiation aging conditions, this application, through the aforementioned multi-peak synergy and sub-mode determination mechanism, incorporates different aging paths into different evaluation branches, thereby avoiding inaccurate characterization by a single infrared characteristic peak under different aging modes and reducing mode-dependent errors caused by differences in aging paths. Furthermore, since the aging path determination results directly constrain the subsequent aging degree grading rules, a more stable and consistent correspondence can be established between the multi-functional group indices and macroscopic performance degradation, thereby improving the characterization ability of infrared non-destructive testing results on the actual performance degradation state of TPO waterproof membranes or TPO waterproof layers, and thus enhancing the stability of aging evaluation results under different service environments. Attached Figure Description

[0049] This application will be further described by way of exemplary embodiments, which will be described in detail with reference to the accompanying drawings. These embodiments are not limiting; in these embodiments, the same reference numerals denote the same structures, wherein:

[0050] Figure 1 This is an exemplary flowchart of a method for detecting the aging degree of a roll waterproofing layer according to some embodiments of this application;

[0051] Figure 2 The graphs show the changes in (a) tensile stress and (b) tensile strain of TPO homogeneous waterproof membrane under different aging processes.

[0052] Figure 3 The graphs show the changes in (a) tensile stress retention rate and (b) tensile strain retention rate of TPO homogeneous waterproof membrane under different aging processes.

[0053] Figure 4 The diagram shows the functional group index of TPO homogeneous waterproof membrane under (a) xenon lamp irradiation and (b) ultraviolet irradiation.

[0054] Figure 5 This is a graph showing the relationship between the cumulative irradiation energy and tensile strength of TPO homogeneous waterproof membrane under xenon lamp irradiation (a), (c), (e) and ultraviolet irradiation (b), (d), (f) and the functional group index of the first characteristic peak (a), (b), (c), (d) and the third characteristic peak (e), (f);

[0055] Figure 6 The graphs show the changes in (a) mass loss rate, (b) mass loss rate per unit area, (c) density loss rate, and (d) volume loss rate of TPO homogeneous waterproof membrane under different aging processes.

[0056] Figure 7 The infrared absorption spectra of TPO homogeneous waterproof membrane under (a) xenon lamp irradiation and (b) ultraviolet irradiation are shown.

[0057] Figure 8 This is an exemplary block diagram of an aging detection system for a roll waterproofing layer according to some embodiments of this application.

[0058] Explanation of the labels in the diagram:

[0059] 01. Infrared Spectroscopy Acquisition Module; 02. Feature Extraction Module; 03. Index Calculation Module; 04. Path Determination Module; 05. Evaluation Module. Detailed Implementation

[0060] The methods and systems provided in the embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0061] The aging test method and system for the rolled waterproofing layer provided in this application will be further described below with reference to the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are only used to explain this application and are not intended to limit the scope of protection of this application.

[0062] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0063] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0064] In the description of this application, the term "for example" is used to mean "used as an example, illustration, or description." Any embodiment described as "for example" in this application is not necessarily to be construed as being more preferred or advantageous than other embodiments. The following description is provided to enable any person skilled in the art to make and use this application. Details are set forth in the following description for purposes of explanation. It should be understood that those skilled in the art will recognize that this application can be made without using these specific details. In other instances, well-known structures and processes will not be described in detail to avoid obscuring the description of this application with unnecessary detail. Therefore, this application is not intended to be limited to the embodiments shown, but is consistent with the broadest scope of the principles and features disclosed in this application.

[0065] like Figure 1 As shown, a method for testing the aging degree of a roll waterproofing layer, used to test TPO waterproofing rolls or TPO waterproofing layers, includes:

[0066] S100, collect the infrared absorption spectrum of the surface of the TPO waterproof membrane or TPO waterproof layer to be tested;

[0067] S200, based on infrared absorption spectrum, extracts... At the first characteristic peak, The second characteristic peak, The third characteristic peak and The peak area of ​​the reference peak;

[0068] S300, determine the first functional group index based on the ratio of the peak area of ​​the first characteristic peak to the peak area of ​​the reference peak; determine the second functional group index based on the ratio of the peak area of ​​the second characteristic peak to the peak area of ​​the reference peak; determine the third functional group index based on the ratio of the peak area of ​​the third characteristic peak to the peak area of ​​the reference peak.

[0069] S400, compare the third functional group index with the preset path determination threshold:

[0070] When the index of the third functional group is greater than the preset path determination threshold, the first aging path type corresponding to the TPO waterproof membrane or TPO waterproof layer to be tested is determined.

[0071] When the third functional group index is less than or equal to the preset path determination threshold, and at least one of the first functional group index and the second functional group index is greater than the corresponding preset oxidation threshold, the second aging path type corresponding to the TPO waterproof membrane or TPO waterproof layer to be tested is determined.

[0072] S500 reads the target evaluation rule corresponding to the aging path type from the pre-stored aging evaluation rules;

[0073] Based on the target evaluation rules and the first functional group index, the second functional group index, and the third functional group index, the aging degree level of the TPO waterproof membrane or TPO waterproof layer to be tested is obtained.

[0074] This application presents a method for detecting the aging degree of rolled waterproofing layers, aiming to address the problems of existing infrared non-destructive testing methods that fail to consider the differences in the oxidative degradation pathways of TPO waterproofing membranes under different irradiation aging conditions. This leads to a pattern-dependent characterization of aging degree by a single infrared characteristic peak index, making it difficult to stably reflect the actual performance degradation of the waterproofing membrane or layer. Research shows that under two typical service environments—photothermal synergy and pure photo-oxidation—TPO waterproofing membranes undergo two aging pathways: a first aging pathway characterized by the large-scale generation of ether / ester products, and a second aging pathway dominated by photo-oxidative chain scission, with products primarily consisting of volatile small molecules. These two pathways exhibit drastically different response patterns on the infrared characteristic peaks, which is the fundamental cause of the pattern-dependent error generated by a single peak index. Therefore, this application constructs a multi-peak synergy / sub-mode determination mechanism. Through a two-stage detection strategy of first determining the path and then selecting the rule, it solves the problem of inaccuracy of a single peak index under different aging modes, achieving accurate and non-destructive assessment of the aging degree of in-service TPO waterproofing membranes or layers.

[0075] In one embodiment, using TPO homogeneous waterproof membrane as the test object, the study investigates its performance degradation patterns, chemical structure evolution patterns, and their correspondence with mechanical properties under different artificial accelerated aging modes, thereby establishing a testing method suitable for grading and evaluating the aging degree of TPO waterproof membranes or TPO waterproof layers. It should be noted that although the following embodiments mainly use TPO homogeneous waterproof membranes as an example, the method of this application is also applicable to already laid TPO waterproof layers; it only requires infrared spectral acquisition at corresponding locations on the surface of the waterproof layer and extraction of the corresponding characteristic peak parameters.

[0076] In this embodiment, TPO homogeneous waterproof membrane was selected as the test sample. The membrane type was H, and the thickness was 1.5 mm. The TPO homogeneous waterproof membrane was cut into rectangular strips with a length of 700 mm and a width of 500 mm. Referring to GB / T 18244-2022, an accelerated aging test was conducted on the TPO strips. Every five strips were grouped together. When the aging process reached the specified time or the specified cumulative irradiation energy, one group of strips was taken for performance testing and infrared spectroscopy testing.

[0077] In this embodiment, to verify the differences in the oxidative degradation pathways of TPO materials under different aging modes, artificial accelerated aging was carried out using two modes: xenon lamp irradiation aging and ultraviolet irradiation aging.

[0078] The xenon lamp irradiation aging was tested using a xenon lamp aging test chamber. The exposure cycle followed a "102 min drying - 18 min spraying" procedure. The broadband irradiance (300-400 nm) was set to 60±2 W / m², and the narrowband irradiance (340 nm) was set to... The black mark temperature was set to 65±3 ℃, the black mark temperature was set to 63±3 ℃, the test chamber temperature was maintained at 38±3 ℃, and the relative humidity was maintained at 50%±10%.

[0079] UV irradiation aging was tested using a UV aging test chamber, with an exposure cycle of "8 h drying - 4 h condensation". The irradiance at 340 nm was set to... The blackboard temperature is set to 60±3 ℃.

[0080] By setting two different artificial accelerated aging modes, the aging behavior of TPO waterproof membrane under different light and heat conditions can be simulated, thus providing an experimental basis for identifying different aging path types.

[0081] To establish the correlation between the infrared functional group index and the actual performance degradation of the material, this embodiment also tests the mass, size and tensile properties of the aged sample.

[0082] Monitor the quality and dimensions of the spline.

[0083] Quality loss rate The following formula is used for calculation:

[0084] ;

[0085] in, and The quality of TPO homogeneous waterproof membranes is defined as follows: before aging and after undergoing specified irradiation energy.

[0086] Unit area mass loss rate The following formula is used for calculation: ; ;in, and These represent the unit area mass before aging and after undergoing a specified irradiation energy, respectively. These represent the roll material's mass, length, and width, respectively.

[0087] Density loss rate The following formula is used for calculation:

[0088] ;

[0089] Volume loss rate The following formula is used for calculation:

[0090] ;in, and The density and volume of the roll material are those before aging and after undergoing a specified irradiation energy, respectively.

[0091] The specimens aged by different irradiation energies were cut into dumbbell shapes and subjected to tensile strength testing using a universal tensile testing machine. During the test, the specimens were clamped in the fixture, ensuring a gauge length of 25 mm, and the applied force was no greater than 5 N. Tensile force was continuously applied at a speed of 100 mm / min until the specimens broke, and the tensile force and deformation values ​​during the tensile process were recorded.

[0092] Tensile stress σ and strain ε are calculated using the following formulas:

[0093] ;

[0094] ;

[0095] Where F is the tensile force, h is the specimen thickness, b is the specimen width, and L and These are the distance between the specimen fixtures and the gauge length, respectively.

[0096] The changes in tensile stress and tensile strain of TPO homogeneous waterproof membrane under different aging modes are as follows: Figure 2 As shown, the changes in tensile stress retention rate and tensile strain retention rate are as follows: Figure 3 As shown, the unaged TPO homogeneous waterproof membrane exhibits obvious toughness characteristics. In the early stage of aging, the tensile stress and tensile strain of the membrane decreased significantly under both aging modes, indicating that the molecular chain of the material has broken. In the middle and late stages of aging, the performance changes under different aging modes showed significant differences. Among them, the membrane under the ultraviolet irradiation mode showed a more significant decrease in the retention rate of tensile stress and tensile strain in the later stage, while the xenon lamp irradiation mode showed different degrees of volume change and thermal effect.

[0097] The above results indicate that although TPO waterproof membranes all exhibit performance degradation under different aging modes, their deterioration processes are not entirely consistent, suggesting that they may have different oxidative degradation pathways.

[0098] In this embodiment, Fourier transform infrared spectroscopy was used to monitor the chemical structural changes of TPO samples during the aging process. The test employed attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR), with 32 scans and a resolution of [resolution missing]. The scanning wavenumber range is to .

[0099] It should be noted that using the ATR-FTIR method to collect infrared absorption spectra is beneficial for non-destructive testing of aging areas on the surface of rolls or waterproof layers. It is particularly suitable for on-site testing or local surface testing of samples, thus meeting the requirements of this application for non-destructive assessment of the aging degree of TPO waterproof rolls or TPO waterproof layers.

[0100] Depend on Figure 7 a and Figure 7 As can be seen from b, the infrared absorption peak of the unaged TPO homogeneous waterproof membrane is mainly distributed between 2700 and... , and At these locations, the corresponding absorptions are the symmetric and asymmetric stretching vibrations of the methylene group (-CH2-), the asymmetric deformation of the methyl group (-CH3), and the bending vibration of the -CH3 group, respectively, corresponding to the characteristic absorptions of polypropylene (PP), the main component of TPO. As aging progresses, samples in both modes show […]. and A new absorption peak appears at [location], corresponding to the C=O stretching vibration of aliphatic ketones, indicating that the TPO surface underwent localized oxidative degradation under ultraviolet light and heat. The appearance of characteristic peaks indicates that deep oxidation has occurred. The key difference lies in the fact that TPO waterproof membranes irradiated by xenon lamps exhibit... An absorption peak that gradually increases with aging appears at a certain point, corresponding to the CO stretching vibration, indicating that the photothermal synergy promotes the formation of a large number of ether / ester products, corresponding to the first aging pathway; while under ultraviolet irradiation mode, No significant absorption peak was observed at this point, indicating that under these conditions, TPO degradation is mainly characterized by photo-oxidative chain scission, and the products are mostly volatile small molecules, corresponding to the second aging pathway. Under both modes... The significant difference in the magnitude of the absorption peaks provides a physicochemical basis for determining the aging path type based on the third functional group index.

[0101] Based on the collected infrared absorption spectrum, extract At the first characteristic peak, The second characteristic peak, The third characteristic peak and The peak area of ​​the reference peak. Among them, The reference peak corresponds to the -CH2- symmetric stretching vibration. This absorption peak remains stable during aging and is therefore used as the normalized reference peak. In specific operations, the concentration of 3000 to... and 1900 to Integrating the characteristic peaks within the range, the peak area of ​​each characteristic peak is expressed as... The peak area at a given location is used as a benchmark for normalization to eliminate the influence of sample thickness differences on the measurement results.

[0102] In one embodiment, the first functional group index Second functional group index and the third functional group index Calculate using the following formulas respectively:

[0103] ;

[0104] ;

[0105] ;

[0106] in, , , They represent , and The peak area of ​​the characteristic peak. express The peak area of ​​the reference peak.

[0107] like Figure 4 a and Figure 4 Figure b shows the changes in the functional group indices of TPO homogeneous waterproof membrane under two aging modes: xenon lamp irradiation and ultraviolet irradiation. In the early stages of aging, all functional group indices are extremely low. With increasing cumulative irradiation energy... and Both models exhibit an exponential growth trend, ranging from 0 to approximately 0.1. The key difference lies in... Xenon lamp irradiation mode It increases significantly during aging, ranging from 0 to approximately 0.55; while under ultraviolet irradiation, The levels remained relatively low throughout the aging process, never exceeding 0.04. (Both modes) The magnitude difference clearly demonstrates the essential difference between the first and second aging pathways in terms of chemical structural evolution, providing a clear numerical basis for determining the pathway type.

[0108] The third functional group index The aging path type of the TPO waterproof membrane or TPO waterproof layer to be tested is determined by comparing it with a preset path determination threshold.

[0109] In one embodiment, the preset path determination threshold is set to 0.1. For example... Figure 4 As shown, under ultraviolet irradiation mode The maximum value is no more than 0.04, while under xenon lamp irradiation mode... The maximum value can reach approximately 0.55, showing a significant difference in magnitude between the two. Selecting 0.1 as the path determination threshold can reliably distinguish between the two types of aging paths. In practical applications, the path determination threshold can be appropriately adjusted according to the material formulation and service environment of the waterproof membrane under test.

[0110] when When the value exceeds the preset path determination threshold, the first aging path type corresponding to the TPO waterproof membrane or TPO waterproof layer to be tested is determined, namely the degradation mode in which a large amount of ether / ester products are generated under the dominance of photothermal synergy.

[0111] when Less than or equal to the preset path determination threshold, and and When at least one of the following conditions exceeds the corresponding preset oxidation threshold, the second aging path type corresponding to the TPO waterproof membrane or TPO waterproof layer under test is determined, namely, the degradation mode mainly characterized by photo-oxidative chain scission. In one embodiment, The corresponding preset oxidation threshold is set to 0.01. The corresponding preset oxidation threshold is set to 0.03; the above threshold can be adjusted according to the actual material properties.

[0112] The pre-stored aging evaluation rules are determined through a pre-established correspondence between functional group index ranges and tensile stress retention rate ranges. Tensile stress retention rate reflects the degree to which the mechanical properties of TPO waterproof membranes are retained and is a key engineering indicator for measuring the deterioration of waterproof membrane performance.

[0113] The correspondence between the functional group index range and the tensile stress retention rate range includes at least the following: a tensile stress retention rate greater than or equal to the first set value corresponds to Level 1 aging; a tensile stress retention rate less than the first set value but greater than or equal to the second set value corresponds to Level 2 or Level 3 aging; a tensile stress retention rate less than the second set value corresponds to Level 4 aging; and the first set value is greater than the second set value.

[0114] In one embodiment, the first set value is 80%, and the second set value is 60%, both falling within the ranges of 70% to 80% and 60% to 70%, respectively. In practical applications, adjustments can be made within these ranges according to the waterproofing project acceptance standards and usage environment requirements. The performance states of the waterproof membrane corresponding to the above set values ​​are as follows: Level 1 aging (tensile stress retention rate ≥ 80%) indicates that the waterproof membrane maintains excellent tensile properties and is in the stage of excellent application performance; Level 2 or Level 3 aging (tensile stress retention rate between 60% and 80%) indicates that the waterproof membrane still maintains certain tensile properties, but the risk of damage under external force will significantly increase, and it is in the stage of qualified performance but requiring attention; Level 4 aging (tensile stress retention rate < 60%) indicates that the waterproof membrane cannot guarantee mechanical properties, its ability to withstand external forces has decreased significantly, and it is in the stage of performance failure.

[0115] Based on the target evaluation rules and the first, second, and third functional group indices, the aging degree level of the TPO waterproof membrane or TPO waterproof layer to be tested is obtained. The aging degree level includes any one of Level 1, Level 2, Level 3, and Level 4 aging.

[0116] In one embodiment, when it is determined that the TPO waterproof membrane or TPO waterproof layer to be tested corresponds to the first aging path type, the target evaluation rule is: to use the third functional group index As the primary determining index, and using the first functional group index... Second functional group index As an additional criterion, it is used to determine the level of aging.

[0117] Will Matching with the third index level threshold range determines the first intermediate level. For example... Figure 5 As shown in e, the threshold range for the third index level is set as follows: When When the value is less than 0.2, the corresponding tensile stress retention rate is higher than 80%, which corresponds to Level 1 aging; when When the value is between 0.2 and 0.4, the tensile stress retention rate deteriorates to 60% to 80%, corresponding to level two or three aging; when When the value is greater than 0.4, the corresponding tensile stress retention rate is less than 60%, which corresponds to level four aging. The above threshold range can be adjusted appropriately according to the actual material properties.

[0118] Then and At least one of the criteria is compared with an additional check threshold to obtain the additional check level. The additional check threshold is based on... and The corresponding relationship with the tensile stress retention rate is set separately: e.g. Figure 5 As shown in a, The additional verification threshold range is set as follows: When When the value is below 0.01, the tensile stress retention rate is higher than 80%, corresponding to Level 1 aging; when When the value is between 0.01 and 0.02, the tensile stress retention rate deteriorates to 60% to 80%, corresponding to level two or three aging; when A value higher than 0.02 corresponds to a tensile stress retention rate of less than 60%, indicating a level four aging condition. For example... Figure 5 As shown in c. The additional verification threshold range is set as follows: When When the value is below 0.03, the tensile stress retention rate is higher than 80%, corresponding to Level 1 aging; when When the value is between 0.03 and 0.07, the tensile stress retention rate deteriorates to 60% to 80%, corresponding to level two or three aging; when A value higher than 0.07 corresponds to a tensile stress retention rate of less than 60%, indicating level four aging. The above additional verification threshold range can be adjusted appropriately based on the actual material properties. and When the aging levels corresponding to the additional verification results are different, the higher of the two is taken as the additional verification level. If the additional verification level is higher than the first intermediate level (i.e., the additional verification result meets the preset correction rule), the aging level is adjusted upward and the additional verification level is taken as the final aging level to ensure that the evaluation result has sufficient conservatism and safety margin; if the additional verification level is not higher than the first intermediate level (i.e., the additional verification result does not meet the preset correction rule), the first intermediate level is not adjusted and is directly output as the final aging level.

[0119] In one embodiment, when it is determined that the TPO waterproof membrane or TPO waterproof layer to be tested corresponds to the second aging path type, the target evaluation rule is: to... and At least one of the following is used as the primary criterion for determining the degree of aging. Match with the first index level threshold range, and / or Matching this with the second index level threshold range yields the second intermediate level. For example... Figure 5 As shown in b, the first index level threshold range is set as follows: When When the value is below 0.01, the corresponding tensile stress retention rate is higher than 80%, which corresponds to Level 1 aging; when When the value is between 0.01 and 0.02, the tensile stress retention rate deteriorates to 60% to 80%, corresponding to level two or three aging; when When the value is higher than 0.02, the corresponding tensile stress retention rate is less than 60%, matching a level four aging process. For example... Figure 5 As shown in d, the second exponential level threshold range is set as follows: when When the value is below 0.03, the corresponding tensile stress retention rate is higher than 80%, which corresponds to Level 1 aging; when When the value is between 0.03 and 0.07, the tensile stress retention rate deteriorates to 60% to 80%, corresponding to level two or three aging; when A value above 0.07 corresponds to a tensile stress retention rate below 60%, matching a level four aging condition. The above threshold range can be adjusted appropriately based on the actual material properties. and When different intermediate levels are used, the higher aging level is selected as the final aging level, following the principle of conservative assessment to prevent underestimating the actual aging risk of the waterproof membrane.

[0120] The results of this study indicate that TPO homogeneous waterproof membranes undergo oxidative degradation under both xenon lamp irradiation and ultraviolet irradiation, leading to deterioration in properties such as tensile strength, mass, and dimensional characteristics. Specifically, this manifests as a decrease in tensile stress and tensile strain, and a reduction in mass and volume. (See attached results). Figure 2 , Figure 3 and Figure 6 .

[0121] Tensile stress of TPO homogeneous waterproof membrane ( Figure 2 a) and tensile strain ( Figure 2 b) Significant changes occurred under different aging modes. Unaged TPO homogeneous waterproof membrane exhibited a tensile stress of 16.3 MPa and a tensile strain of 684.8%, demonstrating clear toughness characteristics. In the early stages of aging, both tensile stress and tensile strain decreased significantly under both aging modes, due to molecular chain breakage under ultraviolet irradiation. As aging progressed, the decline in tensile properties slowed down, and even showed a slight increase, possibly related to the cross-linking of broken molecular chains under irradiation. In the middle and late stages of aging, the effects of xenon lamp irradiation and ultraviolet irradiation on the tensile properties of TPO homogeneous waterproof membrane showed significant differences. This difference was determined by the differences in the photothermal characteristics of the two aging modes: xenon lamp irradiation covers the entire solar spectrum, including ultraviolet, visible, and infrared light, with a significant infrared thermal effect; ultraviolet irradiation has a stronger ultraviolet effect but a relatively weaker thermal effect. The difference between photo-oxidation and thermal effects led to the differential changes in tensile properties under different modes in the later stages of aging.

[0122] The tensile stress retention rate of TPO homogeneous waterproof membrane under different aging modes was statistically analyzed. Figure 3 a) and tensile strain retention rate ( Figure 3 b) Change. Experience. After irradiation, the tensile stress retention rate decreased to 74.1%, and the tensile strain retention rate decreased to 66.0%, indicating that significant chain breakage occurred in the early stages of aging. In the middle stage of aging, the retention rate showed a slow downward trend; in the later stage of aging, the tensile properties of the TPO homogeneous waterproof membrane decreased more significantly under UV irradiation, reflecting the more severe photo-oxidative chain breakage under pure UV conditions in the later stages, which corroborates the chemical mechanism of the second aging pathway.

[0123] like Figure 6 As shown, the mass loss rate of TPO homogeneous waterproof membrane during aging ( Figure 6 a) Gradually increases, consistent with the deterioration trend of tensile properties. Regarding the unit area mass loss rate ( Figure 6 b) Density loss rate ( Figure 6 c) and volume loss rate ( Figure 6Statistical analysis (d) shows that the mass and dimensional changes of TPO waterproof membrane under xenon lamp irradiation are greater than those under ultraviolet irradiation, presumably related to the stronger thermal effect under xenon lamp irradiation. The above-mentioned physical property degradation patterns are related to changes in chemical structure ( Figure 7 ) and the evolution law of functional group index ( Figure 4 These findings corroborate each other and jointly support the rationality of the sub-path evaluation mechanism in this application.

[0124] Figure 5 a and Figure 5 b shows the effects of xenon lamp irradiation and ultraviolet irradiation, respectively. Relationship with tensile stress retention rate Figure 5 c and Figure 5 d shows the two modes respectively Relationship with tensile stress retention rate Figure 5 e and Figure 5 f shows the two modes respectively. The relationship with tensile stress retention rate is shown. It can be seen that as the functional group index increases, the tensile stress retention rate gradually decreases, deteriorating from 100% to below 40%, representing different stages of performance degradation of TPO homogeneous waterproof membranes from excellent to qualified to failure. It is particularly noteworthy that, due to significant differences in the oxidative degradation pathways of TPO waterproof membranes under different aging modes, [the following is a more detailed explanation of the relationship between tensile stress retention rate and tensile stress retention rate]. and There is a clear aging mode dependence when evaluating tensile properties. Figure 5 c and Figure 5 d、 Figure 5 e and Figure 5 The regular differences between f are intuitively reflected, which is precisely the core problem that the path determination mechanism of this application aims to solve. By adopting a two-stage strategy of first determining the aging path type and then matching the corresponding evaluation rules, this application eliminates the above-mentioned pattern dependency error and achieves accurate and non-destructive assessment of the aging degree of TPO waterproof membranes or TPO waterproof layers.

[0125] As attached Figure 8 As shown, based on the inventive concept of the method for detecting the aging degree of a roll waterproofing layer provided in Embodiment 1, this application also provides a system for detecting the aging degree of a roll waterproofing layer, specifically including:

[0126] Infrared spectral acquisition module 01 is used to acquire infrared absorption spectra on the surface of the TPO waterproof membrane or waterproof layer to be tested.

[0127] Feature extraction module 02 is used to extract the area of ​​characteristic peaks based on the infrared absorption spectrum and output multiple peak area values;

[0128] The index calculation module 03 is used to calculate multiple functional group indices based on the peak area value and normalization processing to obtain a set of functional group indices.

[0129] The path determination module 04 is used to dynamically determine the aging path type based on the functional group index set and a preset path determination threshold, and obtain the aging path determination result.

[0130] The evaluation module 05 is used to retrieve the pre-stored aging evaluation rules based on the aging path determination results, and combine the functional group index set to determine the aging degree level of the waterproof membrane or waterproof layer under test, and obtain the aging degree level determination conclusion.

[0131] In one embodiment, the infrared spectrum acquisition module 01 is further used for:

[0132] An integrated ATR-FTIR spectrometer was used to perform non-destructive measurements directly on the surface of the TPO waterproof membrane or waterproof layer in attenuated total reflectance mode. The test parameters were: 32 scans and [missing information - likely a resolution value]. Scan wavenumber range 400 to The original infrared absorption spectrum is output to the feature extraction module 02.

[0133] Furthermore, the infrared spectrum acquisition module 01 also includes:

[0134] The ATR-FTIR spectrometer supports direct measurement of surfaces without pretreatment, and is suitable for both laboratory testing and on-site non-destructive testing applications. It can perform in-situ spectral sampling on in-use TPO waterproofing layers on building roofs or other structural parts.

[0135] In one embodiment, the feature extraction module 02 is further configured to:

[0136] After receiving the raw infrared absorption spectrum output by the infrared spectral acquisition module 01 and completing baseline correction, the following steps are performed: , , Three characteristic peaks and Integrate the peak area at the reference peak and output the peak area value. , , and To the index calculation module 03.

[0137] Furthermore, the feature extraction module 02 also includes:

[0138] , , and The characteristic peaks correspond to the C=O stretching vibration, the C=C unsaturated bond stretching vibration, the CO stretching vibration, and the -CH2- symmetric stretching vibration, respectively; among them, The reference peak remains relatively stable during the aging process. Normalizing it can eliminate absolute intensity changes caused by factors unrelated to aging, such as differences in sample thickness and fluctuations in measured compressive force, thereby improving the comparability of functional group indices across samples.

[0139] In one embodiment, the exponent calculation module 03 is further used for:

[0140] Receive the peak area value output by feature extraction module 02, and calculate the first functional group index according to the normalization formula. Second functional group index and the third functional group index The three functional group indices are then transmitted to the path determination module 04 and the evaluation module 05, respectively.

[0141] In one embodiment, the path determination module 04 is further configured to:

[0142] Receive the set of functional group indices, and include the third functional group index. Compare with the preset path determination threshold; if If the value exceeds the preset path determination threshold, then the first aging path type determination result is output; if... If the value is not greater than the preset path determination threshold, then the first functional group index is further determined. Whether it exceeds the preset oxidation threshold or the second functional group index If the value exceeds the preset oxidation threshold, and at least one of the conditions is met, the second aging path type determination result is output; if none of the three indices exceed the above threshold, the "early stage of aging / no significant aging" signal is output, corresponding to the first stage of aging; the aging path determination result is transmitted to the evaluation module 05.

[0143] Furthermore, the path determination module 04 also includes:

[0144] The preset path determination threshold is set to 0.05; the first functional group index... The corresponding preset oxidation threshold is 0.01, and the second functional group index is... The corresponding preset oxidation threshold is 0.03; among them, the first aging path type corresponds to the photothermal synergistic oxidation path, and the second aging path type corresponds to the photo-oxidative chain scission path. The two types of aging paths are in... The fundamental difference in the accumulation of ether / ester products at different locations provides the physicochemical basis for establishing the pathway pattern determination mechanism.

[0145] In one embodiment, the evaluation module 05 is further configured to:

[0146] The aging path determination result output by the receiving path determination module 04 is used to retrieve the corresponding target evaluation rule from the pre-stored aging evaluation rule database; for the first aging path type, the third functional group index is used. Substituting the third index level threshold range to determine the first intermediate level, and using the first functional group index Second functional group index The additional verification results are used to correct the first intermediate level to obtain the aging level determination conclusion; for the second aging path type, the first functional group index is... Second functional group index Substitute the values ​​into the corresponding threshold ranges for matching, and take the higher level as the aging level determination conclusion; output the aging determination conclusions from level one to level four to the display unit or test report system.

[0147] Furthermore, evaluation module 05 also includes:

[0148] For the first aging path type, the rule for dividing the threshold range of the third index level is as follows: A value less than 0.2 corresponds to Level 1 aging. A value between 0.2 and 0.3 corresponds to level two aging. A value between 0.3 and 0.4 corresponds to Level 3 aging. A value not less than 0.4 corresponds to Level 4 aging; the correction rule for the additional verification is: when the index of the first functional group is not less than 0.4... With the second functional group index If all the additional verification results point to an aging level higher than the first intermediate level, the first intermediate level will be adjusted to the next higher level.

[0149] Furthermore, evaluation module 05 also includes:

[0150] The correspondence between aging level and tensile stress retention rate is as follows: Level 1 aging corresponds to a tensile stress retention rate of not less than 80%, indicating excellent waterproof layer performance; Level 2 aging corresponds to a tensile stress retention rate between 70% and 80%, indicating an increased risk of damage to the waterproof layer under external forces; Level 3 aging corresponds to a tensile stress retention rate between 60% and 70%, indicating significant deterioration in the mechanical properties of the waterproof layer; Level 4 aging corresponds to a tensile stress retention rate below 60%, indicating severe deterioration in the mechanical properties of the waterproof layer and a significant decrease in its ability to withstand external forces. This correspondence is pre-stored in the aging evaluation rule database for use by the evaluation module 05.

[0151] Furthermore, evaluation module 05 also includes:

[0152] Data transmission between functional modules can be achieved via wired or wireless means. The entire testing process can be automated, with rapid on-site testing capabilities. It is suitable for non-destructive assessment and maintenance decision support of the service status of TPO waterproofing layers on building roofs or other structural parts.

[0153] It should be noted that the order of the embodiments described above is merely for descriptive purposes and does not represent the superiority or inferiority of the embodiments. Furthermore, the above description focuses on specific embodiments of this specification. Additionally, the processes depicted in the accompanying drawings do not necessarily require a specific or sequential order to achieve the desired results. In some implementations, multitasking and parallel processing are possible or may be advantageous.

[0154] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

[0155] This specification and accompanying drawings are merely illustrative examples of this application and are intended to cover any and all modifications, variations, combinations, or equivalents within the scope of this application. Clearly, those skilled in the art can make various alterations and modifications to this application without departing from its scope. Therefore, if such modifications and variations fall within the scope of this application and its equivalents, this application intends to include such modifications and variations.

Claims

1. A method for testing the aging degree of a rolled waterproofing layer, used to test TPO waterproofing membranes or TPO waterproofing layers, characterized in that, include: Collect the infrared absorption spectrum of the surface of the TPO waterproof membrane or TPO waterproof layer to be tested; Extraction based on infrared absorption spectrum At the first characteristic peak, The second characteristic peak, The third characteristic peak and The peak area of ​​the reference peak; The first functional group index is determined by the ratio of the peak area of ​​the first characteristic peak to the peak area of ​​the reference peak; the second functional group index is determined by the ratio of the peak area of ​​the second characteristic peak to the peak area of ​​the reference peak; and the third functional group index is determined by the ratio of the peak area of ​​the third characteristic peak to the peak area of ​​the reference peak. The third functional group index is compared with the preset path determination threshold: When the index of the third functional group is greater than the preset path determination threshold, the first aging path type of the TPO waterproof membrane or TPO waterproof layer to be tested is determined, namely the degradation mode in which a large amount of ether / ester products are generated under the dominance of photothermal synergy. When the third functional group index is less than or equal to the preset path determination threshold, and at least one of the first functional group index and the second functional group index is greater than the corresponding preset oxidation threshold, the second aging path type corresponding to the TPO waterproof membrane or TPO waterproof layer to be tested is determined, that is, the degradation mode mainly based on photo-oxidative chain scission. Read the target evaluation rule corresponding to the aging path type from the pre-stored aging evaluation rules; Based on the target evaluation rules read, as well as the first functional group index, the second functional group index, and the third functional group index, the aging degree level of the TPO waterproof membrane or TPO waterproof layer to be tested is obtained. When the first aging path type is determined to be the TPO waterproof membrane or TPO waterproof layer to be tested, the target evaluation rule is: the third functional group index is used as the main judgment index, and the first functional group index and the second functional group index are used as additional judgment indices to determine the aging level. When the second aging path type is determined to be the TPO waterproof membrane or TPO waterproof layer to be tested, the target evaluation rule is: to use at least one of the first functional group index and the second functional group index as the main judgment index to determine the aging degree level.

2. The method for detecting the aging degree of the roll waterproofing layer according to claim 1, characterized in that: Infrared absorption spectra were acquired using attenuated total reflection Fourier transform infrared spectroscopy.

3. The method for detecting the aging degree of the roll waterproofing layer according to claim 2, characterized in that: The first functional group index is calculated using the following formula: ; The second functional group index is calculated using the following formula: ; The third functional group index is calculated using the following formula: ; in, express The peak area of ​​the first characteristic peak. express The peak area of ​​the second characteristic peak. express The peak area of ​​the third characteristic peak. express The peak area of ​​the reference peak.

4. The method for detecting the aging degree of the roll waterproofing layer according to claim 3, characterized in that: When the target evaluation rule uses the third functional group index as the main criterion: The third functional group index is matched with the third index level threshold range, and the first intermediate level is determined based on the matching result. Then, at least one of the first functional group index and the second functional group index is compared with an additional verification threshold; When the additional verification results meet the preset correction rules, the first intermediate level is adjusted to obtain the aging level.

5. The method for detecting the aging degree of the roll waterproofing layer according to claim 3, characterized in that: When the target evaluation rule uses at least one of the first functional group index and the second functional group index as the main criterion: The first functional group index is matched with the first index level threshold range, and / or the second functional group index is matched with the second index level threshold range to obtain the second intermediate level. When the first functional group index and the second functional group index correspond to different intermediate levels, the higher aging level is selected as the aging degree level.

6. The method for testing the aging degree of the roll waterproofing layer according to claim 4 or 5, characterized in that: The aging level is divided into four levels: Level 1 aging, Level 2 aging, Level 3 aging, and Level 4 aging.

7. The method for detecting the aging degree of the roll waterproofing layer according to claim 6, characterized in that: The pre-stored aging evaluation rules are determined by the pre-established correspondence between functional group index intervals and tensile stress retention rate intervals; The correspondence between the functional group index range and the tensile stress retention rate range includes at least the following: Tensile stress retention rate greater than or equal to the first set value corresponds to Level 1 aging; A tensile stress retention rate that is less than the first set value and greater than or equal to the second set value corresponds to a level 2 or level 3 aging process. A tensile stress retention rate less than the second set value corresponds to Level 4 aging. The first setting value is greater than the second setting value.

8. The method for detecting the aging degree of the roll waterproofing layer according to claim 7, characterized in that: The first set value is within the range of 70% to 80%; The second set value is in the range of 60% to 70%.

9. A system for detecting the aging degree of a roll waterproofing layer, used to detect TPO waterproofing rolls or TPO waterproofing layers, characterized in that, include: The infrared spectroscopy acquisition module is used to acquire the infrared absorption spectrum of the surface of the TPO waterproof membrane or TPO waterproof layer to be tested. The feature extraction module is used to extract features based on the infrared absorption spectrum. At the first characteristic peak, The second characteristic peak, The third characteristic peak and The peak area of ​​the reference peak; The index calculation module is used to determine the first functional group index based on the ratio of the peak area of ​​the first characteristic peak to the peak area of ​​the reference peak, the second functional group index based on the ratio of the peak area of ​​the second characteristic peak to the peak area of ​​the reference peak, and the third functional group index based on the ratio of the peak area of ​​the third characteristic peak to the peak area of ​​the reference peak. The path determination module is used to compare the third functional group index with the preset path determination threshold, and determine the first aging path type when the third functional group index is greater than the preset path determination threshold, that is, the degradation mode in which a large amount of ether / ester products are generated under the dominance of photothermal synergy. The second aging path type is determined when the third functional group index is not greater than the preset path determination threshold and at least one of the first functional group index and the second functional group index is greater than the corresponding preset oxidation threshold; that is, the degradation mode is mainly based on photo-oxidative chain scission. When the first aging path type is determined to be the TPO waterproof membrane or TPO waterproof layer to be tested, the target evaluation rule is: the third functional group index is used as the main judgment index, and the first functional group index and the second functional group index are used as additional judgment indices to determine the aging level. When it is determined that the TPO waterproof membrane or TPO waterproof layer to be tested corresponds to the second aging path type, the target evaluation rule is: to use at least one of the first functional group index and the second functional group index as the main judgment index to determine the aging degree level. The evaluation module is used to read the target evaluation rule corresponding to the aging path type from the pre-stored aging evaluation rules based on the aging path type determined by the path determination module, and input the first functional group index, the second functional group index and the third functional group index into the target evaluation rule to obtain the aging degree level of the TPO waterproof membrane or TPO waterproof layer to be tested.

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