A method and system for quantitative evaluation of the light-aging resistance of high-density polyethylene
Patent Information
- Application Number
- CN202611193049.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-08-07
- Publication Date
- 2026-10-23
AI Technical Summary
[0006]为此，本发明所要解决的技术问题在于克服现有技术中标准实验室加速老化方法采用固定的、普适性的条件，无法准确模拟HDPE材料在特定目标地域的真实老化严酷度的问题，并克服无法给出HDPE材料的量化指标的问题
本发明所述的高密度聚乙烯抗光老化性能的定量评估方，通过考虑目标地域气候数据与光化学，将固定的标准测试条件转化为与真实环境严酷度相匹配的定制化条件，从根本上提高了实验室加速老化试验的模拟真实性和寿命预测的可靠性；
Smart Images
Figure CN122961893A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of material aging and failure analysis technology, and in particular to a quantitative evaluation method and system for the photoaging resistance of high-density polyethylene. Background Technology
[0002] High-density polyethylene (HDPE) is widely used in outdoor cable sheathing, pipes, and other fields due to its excellent overall performance. However, environmental factors, such as light radiation, are major contributors to the aging and degradation of HDPE materials. This radiation causes molecular chain breakage and oxidation, leading to brittleness, cracking, and a significant decrease in mechanical properties (especially elongation at break), ultimately resulting in failure. Therefore, accurate and rapid assessment of the weather resistance of HDPE materials and their protective products is crucial for product design, selection, and lifespan prediction.
[0003] To assess the weather resistance of HDPE materials, two main methods are currently used: outdoor natural exposure and accelerated aging in the laboratory. However, both have significant drawbacks. Outdoor natural exposure yields reliable results but suffers from excessively long testing periods, typically several years, which cannot meet the needs of rapid product development and selection. Accelerated aging in the laboratory is widely used due to its speed and controllability. However, existing accelerated aging methods in the laboratory have technological gaps when addressing practical problems in multi-layered engineering projects. Aging data can only serve as a basis for comparing the weather resistance of different grades of materials and is far removed from real-world engineering environments.
[0004] Furthermore, existing standard laboratory accelerated aging methods (such as QUV's UVA-340 light source, 0.76 W / m² @340nm, 60℃ illumination / 50℃ condensation cycle) employ fixed, universal conditions. However, the light radiation intensity, spectral distribution, ambient temperature, and humidity cycles that HDPE materials experience in actual service vary greatly from region to region. Testing under fixed conditions cannot accurately simulate the true aging severity of HDPE materials in specific target regions, leading to significant deviations when extrapolating laboratory data to real-world environments. This results in either overly conservative lifetime predictions leading to wasted costs or overly optimistic predictions that introduce the risk of early failure.
[0005] In summary, conventional laboratory accelerated aging methods fail to consider regional climate factors and can only provide qualitative or semi-quantitative comparisons between samples with and without protective structures, unable to provide quantitative indicators for HDPE materials (such as "lifespan extension" or "protective efficiency"). This results in the design and optimization of protective structures heavily relying on experience and costly long-term outdoor exposure, hindering the refined development of products. Therefore, a laboratory accelerated testing method that can quantitatively correlate with regional climate data is urgently needed. Summary of the Invention
[0006] Therefore, the technical problem to be solved by the present invention is to overcome the problem that the standard laboratory accelerated aging method in the prior art uses fixed and universal conditions, which cannot accurately simulate the real aging severity of HDPE materials in a specific target area, and to overcome the problem that it is impossible to give quantitative indicators of HDPE materials.
[0007] To address the aforementioned technical problems, this invention provides a quantitative evaluation method for the photoaging resistance of high-density polyethylene, comprising: Step S1: Select a light source and calculate the irradiance per unit area of the light source. ; Step S2: Based on the irradiance per unit area of the light source Calculate the annual radiation dose Required experimental testing time The annual radiation dose Calculated based on the geographical area where the high-density polyethylene target service area is determined; Step S3: Place the first and second samples at a preset test temperature. Irradiance per unit area of the light source The total duration of the experiment is the testing time. The accelerated aging test was conducted, wherein the first sample was an unprotected high-density polyethylene sample, and the second sample was a high-density polyethylene sample with corrugated pipe protection. Step S4: In the accelerated aging test, determine the time required for the first sample and the second sample to fail due to aging according to the preset performance failure criterion. and ; Step S5: Based on the material life of the first sample Material life of the second sample The lifetime gain of high-density polyethylene material was calculated. The actual effective protection efficiency is constructed based on the time required for each of the two samples to age and fail. .
[0008] In one embodiment of the present invention, step S1 calculates the irradiance per unit area of the light source. The formula is: (1); in, This represents the actual irradiance of the light source per unit area of the material. For different light source wavelengths; The irradiance of the light source at a preset wavelength; The wavelength of the radiation emitted by the light source; The angle between the incident direction of the light ray and the normal to the material surface; This refers to the reflectivity of HDPE for different wavelengths; This refers to the area of the HDPE surface that receives radiation.
[0009] In one embodiment of the present invention, step S2 is based on the irradiance per unit area of the light source. Calculate the annual radiation dose Required experimental testing time The formula is: (2); in, The radiation dose for a geographical region over one year; The irradiance of the light source; The apparent activation energy of the photo-oxidation reaction of HDPE material; The gas molar constant; The average annual temperature of the geographical region; The temperature was tested in the experiment.
[0010] In one embodiment of the present invention, the preset performance failure criterion of step S4 is that the sample elongation at break retention rate is less than a preset percentage, wherein the preset percentage is 80%.
[0011] In one embodiment of the present invention, step S5 constructs the actual effective protection efficiency based on the time required for the aging failure of each of the two samples. The formula is: (3); in, This is the time required for the first sample to fail due to aging. This is the time required for the second sample to fail due to aging.
[0012] In one embodiment of the present invention, step S5 is based on the material lifetime of the first sample. Material life of the second sample The lifetime gain of high-density polyethylene material was calculated. : (4).
[0013] To address the aforementioned technical problems, this invention provides a quantitative evaluation system for the photoaging resistance of high-density polyethylene, comprising: The calculation module is used to select a light source and calculate the irradiance per unit area of the light source. ; The experimental test time calculation module is used to calculate the irradiance per unit area of the light source. Calculate the annual radiation dose Required experimental testing time The annual radiation dose Calculated based on the geographical area where the high-density polyethylene target service area is determined; The aging test module is used to test the first and second samples at a preset test temperature. Irradiance per unit area of the light source The total duration of the experiment is the testing time. The accelerated aging test was conducted, wherein the first sample was an unprotected high-density polyethylene sample, and the second sample was a high-density polyethylene sample with corrugated pipe protection. The protection efficiency construction module is used to determine the time required for the first sample and the second sample to fail due to aging, based on a preset performance failure criterion, during the accelerated aging test. and ; The lifetime gain calculation module is used to calculate the material lifetime of the first sample. Material life of the second sample The lifetime gain of high-density polyethylene material was calculated. The actual effective protection efficiency is constructed based on the time required for each of the two samples to age and fail. .
[0014] To address the aforementioned technical problems, the present invention provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the steps of the quantitative evaluation method for the photoaging resistance of high-density polyethylene described above.
[0015] To address the aforementioned technical problems, the present invention provides a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the steps of the quantitative evaluation method for the photoaging resistance of high-density polyethylene as described above.
[0016] To solve the above-mentioned technical problems, the present invention provides a computer program product, including a computer program, characterized in that, when the computer program is executed by a processor, it implements the steps of the quantitative evaluation method for the anti-photoaging properties of high-density polyethylene as described above.
[0017] Compared with the prior art, the above-described technical solution of the present invention has the following advantages: The quantitative evaluation method for the anti-photoaging performance of high-density polyethylene described in this invention, by taking into account the climate data and photochemistry of the target region, transforms the fixed standard test conditions into customized conditions that match the severity of the real environment, fundamentally improving the simulation realism of laboratory accelerated aging tests and the reliability of life prediction. This invention, by comparing the performance degradation curves of HDPE samples with and without corrugated pipe protection under the same customized accelerated conditions, can clearly and quantitatively evaluate the material lifetime gain. This provides experimental data support for the protection design. Attached Figure Description
[0018] To make the content of this invention easier to understand, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings.
[0019] Figure 1 This is a flowchart of the method of the present invention. Detailed Implementation
[0020] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments described are not intended to limit the present invention.
[0021] Example 1 Reference Figure 1 As shown, this invention relates to a quantitative evaluation method for the photoaging resistance of high-density polyethylene, comprising: Step S1: Select a light source and calculate the irradiance per unit area of the light source. ; Step S2: Based on the irradiance per unit area of the light source Calculate the annual radiation dose Required experimental testing time The annual radiation dose Calculated based on the geographical area where the high-density polyethylene target service area is determined; Step S3: Place the first and second samples at a preset test temperature. Irradiance per unit area of the light source The total duration of the experiment is the testing time. The accelerated aging test was conducted, wherein the first sample was an unprotected high-density polyethylene sample, and the second sample was a high-density polyethylene sample with corrugated pipe protection. Step S4: In the accelerated aging test, determine the time required for the first sample and the second sample to fail due to aging according to the preset performance failure criterion. and (That is, to obtain the lifespan of the sample material); Step S5: Based on the material life of the first sample Material life of the second sample The lifetime gain of high-density polyethylene material was calculated. The actual effective protection efficiency is constructed based on the time required for each of the two samples to age and fail. .
[0022] The following is a detailed description of this embodiment: Further, step S1 calculates the irradiance per unit area of the light source. The formula is: (1) in, This represents the actual irradiance of the light source per unit area of the material. For different light source wavelengths; The irradiance of the light source at a preset wavelength; The wavelength of the radiation emitted by the light source; The angle between the incident direction of the light ray and the normal to the material surface; This refers to the reflectivity of HDPE for different wavelengths; This refers to the area of the HDPE surface that receives radiation.
[0023] It should be noted that existing methods do not consider the actual illumination conditions, that is, they assume that the incident light illuminates the material perpendicularly. , However, the actual situation on engineering sites is often not like this. For example, on an HDPE geomembrane on a sloping slope, the angle of sunlight exposure will inevitably be non-zero. If this is not corrected, the actual amount of radiation received by the material will be deviated. Therefore, this embodiment introduces the following into formula (1): Regarding the incident light angle ( The following has been corrected. Furthermore, different products have varying sensitivities to different wavelengths of light, thus requiring different protection targets. For example, among textiles, silk products are more sensitive to UVB, while curtains are more sensitive to UVA; solar panels are more sensitive to infrared light; cosmetics are more sensitive to UVA; and sunscreens primarily target UVB protection, using all wavelengths of light. They may provide insufficient protection for the most damaging wavelengths, while providing excessive protection for less sensitive wavelengths. Specifically, for HDPE products, HDPE food packaging is more sensitive to visible light, especially blue light in the 400-500nm range. Outdoor HDPE geomembranes are more sensitive to UVB (290-320 nm). In formula (1) of this embodiment, It allows for selection based on the target of protection, making it more targeted.
[0024] Further, step S2 is based on the irradiance per unit area of the light source. Calculate the annual radiation dose Required experimental testing time The formula is: (2) in, The radiation dose for a geographical region over one year; The irradiance of the light source; The apparent activation energy of the photo-oxidation reaction of HDPE materials; The gas molar constant; The average annual temperature of the geographical region; The temperature was tested in the experiment.
[0025] Further, in step S4, two sets of samples (sample 1 and sample 2) are prepared. Sample 1 is an unprotected high-density polyethylene (HDPE) sample, and sample 2 is a high-density polyethylene (HDPE) sample with corrugated pipe protection. Both sets of samples are placed in an aging chamber, and samples 1 and 2 are subjected to a preset test temperature. Irradiance per unit area of the light source The total duration of the experiment is the testing time. Accelerated aging tests were conducted. Samples were taken at multiple time points to statistically analyze the elongation at break.
[0026] In this embodiment, The preferred K value is 273.15 ~ 373.15.
[0027] Furthermore, using elongation at break as the core aging evaluation index for HDPE materials, the elongation at break of each group of samples was tested and recorded at different aging stages. The elongation at break retention rate (elongation at break retention rate = elongation at break at time t / initial elongation at break) of the two groups of samples was plotted as a function of equivalent aging time.
[0028] Furthermore, the preset performance failure criterion in step S4 is that the sample's elongation at break retention rate is less than a preset percentage, wherein the preset percentage is 80%. Furthermore, step S5 constructs the actual effective protection efficiency based on the aging failure time required for each of the two samples. The formula is: (3) in, This value represents the actual effective protection efficiency and was obtained through experiments.
[0029] Further, step S5 is based on the material lifetime of the first sample. Material life of the second sample The lifetime gain of high-density polyethylene material was calculated. : (4) Example 2 This embodiment provides a quantitative evaluation system for the photoaging resistance of high-density polyethylene, including: The calculation module is used to select a light source and calculate the irradiance per unit area of the light source. ; The experimental test time calculation module is used to calculate the irradiance per unit area of the light source. Calculate the annual radiation dose Required experimental testing time The annual radiation dose Calculated based on the geographical area where the high-density polyethylene target service area is determined; The aging test module is used to test the first and second samples at a preset test temperature. Irradiance per unit area of the light source The total duration of the experiment is the testing time. The accelerated aging test was conducted, wherein the first sample was an unprotected high-density polyethylene sample, and the second sample was a high-density polyethylene sample with corrugated pipe protection. The protection efficiency construction module is used to determine the time required for the first sample and the second sample to fail due to aging, based on a preset performance failure criterion, during the accelerated aging test. and ; The lifetime gain calculation module is used to calculate the material lifetime of the first sample. Material life of the second sample The lifetime gain of high-density polyethylene material was calculated. The actual effective protection efficiency is constructed based on the time required for each of the two samples to age and fail. .
[0030] Example 3 This embodiment provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the steps of the quantitative evaluation method for the anti-photoaging properties of high-density polyethylene described in Embodiment 1.
[0031] Example 4 This embodiment provides a computer-readable storage medium storing a computer program thereon. When the computer program is executed by a processor, it implements the steps of the quantitative evaluation method for the anti-photoaging properties of high-density polyethylene described in Embodiment 1.
[0032] Example 5 This embodiment provides a computer program product, including a computer program that, when executed by a processor, implements the steps of the quantitative evaluation method for the anti-photoaging properties of high-density polyethylene as described in Embodiment 1.
[0033] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code. The solutions in the embodiments of this application can be implemented in various computer languages, such as the object-oriented programming language Java and the interpreted scripting language JavaScript.
[0034] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.
[0035] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.
[0036] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.
[0037] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.
Claims
1. A quantitative evaluation method for the photoaging resistance of high-density polyethylene, characterized in that, include: Step S1: Select a light source and calculate the irradiance per unit area of the light source. ; Step S2: Based on the irradiance per unit area of the light source Calculate the annual radiation dose Required experimental testing time The annual radiation dose Calculated based on the geographical area where the high-density polyethylene target service area is determined; Step S3: Place the first and second samples at a preset test temperature. Irradiance per unit area of the light source The total duration of the experiment is the testing time. The accelerated aging test was conducted, wherein the first sample was an unprotected high-density polyethylene sample, and the second sample was a high-density polyethylene sample with corrugated pipe protection. Step S4: In the accelerated aging test, determine the time required for the first sample and the second sample to fail due to aging according to the preset performance failure criterion. and ; Step S5: Based on the material life of the first sample Material life of the second sample The lifetime gain of high-density polyethylene material was calculated. The actual effective protection efficiency is constructed based on the time required for each of the two samples to age and fail. .
2. The quantitative evaluation method for the photoaging resistance of high-density polyethylene according to claim 1, characterized in that: Step S1 calculates the irradiance per unit area of the light source. The formula is: （1）； in, This represents the actual irradiance of the light source per unit area of the material. For different light source wavelengths; The irradiance of the light source at a preset wavelength; The wavelength of the radiation emitted by the light source; The angle between the incident direction of the light ray and the normal to the material surface; This refers to the reflectivity of HDPE for different wavelengths; This refers to the area of the HDPE surface that receives radiation.
3. The quantitative evaluation method for the photoaging resistance of high-density polyethylene according to claim 1, characterized in that: Step S2 is based on the irradiance per unit area of the light source. Calculate the annual radiation dose Required experimental testing time The formula is: （2）； in, The radiation dose for a geographical region over one year; The irradiance of the light source; The apparent activation energy of the photo-oxidation reaction of HDPE material; The gas molar constant; The average annual temperature of the geographical region; The temperature was tested in the experiment.
4. The quantitative evaluation method for the photoaging resistance of high-density polyethylene according to claim 1, characterized in that: The preset performance failure criterion in step S4 is that the sample's elongation at break retention rate is less than a preset percentage, wherein the preset percentage is 80%.
5. The quantitative evaluation method for the photoaging resistance of high-density polyethylene according to claim 1, characterized in that: Step S5 constructs the actual effective protection efficiency based on the aging failure time required for each of the two samples. The formula is: （3）； in, This is the time required for the first sample to fail due to aging. This is the time required for the second sample to fail due to aging.
6. The quantitative evaluation method for the photoaging resistance of high-density polyethylene according to claim 1, characterized in that: Step S5 is based on the material lifespan of the first sample. Material life of the second sample The lifetime gain of high-density polyethylene material was calculated. : （4）。 7. A quantitative evaluation system for the photoaging resistance of high-density polyethylene, characterized in that, include: The calculation module is used to select a light source and calculate the irradiance per unit area of the light source. ; The experimental test time calculation module is used to calculate the irradiance per unit area of the light source. Calculate the annual radiation dose Required experimental testing time The annual radiation dose Calculated based on the geographical area where the high-density polyethylene target service area is determined; The aging test module is used to test the first and second samples at a preset test temperature. Irradiance per unit area of the light source The total duration of the experiment is the testing time. The accelerated aging test was conducted, wherein the first sample was an unprotected high-density polyethylene sample, and the second sample was a high-density polyethylene sample with corrugated pipe protection. The protection efficiency construction module is used to determine the time required for the first sample and the second sample to fail due to aging, based on a preset performance failure criterion, during the accelerated aging test. and ; The lifetime gain calculation module is used to calculate the material lifetime of the first sample. Material life of the second sample The lifetime gain of high-density polyethylene material was calculated. The actual effective protection efficiency is constructed based on the time required for each of the two samples to age and fail. .
8. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, it implements the steps of the quantitative evaluation method for the photoaging resistance of high-density polyethylene as described in any one of claims 1 to 6.
9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by the processor, it implements the steps of the quantitative evaluation method for the photoaging resistance of high-density polyethylene as described in any one of claims 1 to 6.
10. A computer program product, comprising a computer program, characterized in that, When executed by a processor, the computer program implements the steps of the quantitative evaluation method for the photoaging resistance of high-density polyethylene as described in any one of claims 1 to 6.