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Method for predicting aging failure rule and service life of polymer material under multiple environmental factors

A polymer material and prediction method technology, applied in the direction of analysis materials, measuring devices, instruments, etc., can solve problems such as insufficient reliability of life prediction, change of aging mechanism, linear deviation of Arrhenius curve, etc.

Active Publication Date: 2014-12-03
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the accelerated aging test under a single factor cannot completely simulate the overall degradation process and mechanism of the material under the conditions of multiple aging factors in the normal use environment
In addition, in order to shorten the test time, over-intensified single-factor conditions may cause changes in the aging mechanism, resulting in failure of life prediction
For example, in the process of accelerated aging by increasing the temperature, when using the Arrhenius formula to extrapolate the aging failure curve of the polymer material at high temperature to the normal service temperature, Arrhenius will often appear due to the inconsistency of the aging mechanism at high temperature and low temperature. The phenomenon of linear deviation of the Stein curve leads to the failure of extrapolation
Therefore, the reliability of life prediction using single-factor accelerated aging test is not enough, and there is a big risk in the life prediction process.

Method used

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  • Method for predicting aging failure rule and service life of polymer material under multiple environmental factors
  • Method for predicting aging failure rule and service life of polymer material under multiple environmental factors
  • Method for predicting aging failure rule and service life of polymer material under multiple environmental factors

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Example 1 Prediction method of outdoor aging failure law of polymer material Hailaer under the condition of multiple environmental factors

[0055] Polypropylene (T30s, Dushanzi Petrochemical) was used as the polymer material, and then a dumbbell-shaped specimen conforming to the ASTM tensile test standard was further prepared by injection molding.

[0056] Use the xenon lamp aging test box (CI 3000+, Atlas) to prepare the dumbbell-shaped sample. The temperature of the test box is 55±0.5°C, the temperature of the blackboard is 70±0.5°C, the relative humidity is 65±5%, and the irradiance is 0.55 W / m 2 / nm (at 340nm), 102min drying plus 18min deionized water spray cycle conditions for accelerated aging test (GB / T 16422.2-1999 / ISO4892-2:1994).

[0057] The outdoor aging experiment in Hailaer was carried out on polypropylene tensile splines. The polypropylene tensile splines were placed on an aging exposure frame facing south at a 45° angle, and the two ends of the splines...

Embodiment 2

[0062] Example 2 Prediction method of polymer material Guangzhou outdoor aging failure law under multiple environmental factors

[0063] Polypropylene (T30s, Dushanzi Petrochemical) was used as the polymer material, and then a dumbbell-shaped specimen conforming to the ASTM tensile test standard was further prepared by injection molding.

[0064] Use the xenon lamp aging test box (CI 3000+, Atlas) to prepare the dumbbell-shaped sample. The temperature of the test box is 55±0.5°C, the temperature of the blackboard is 70±0.5°C, the relative humidity is 65±5%, and the irradiance is 0.55 W / m 2 / nm (at 340nm), 102min drying plus 18min deionized water spray cycle conditions for accelerated aging test (GB / T 16422.2-1999 / ISO4892-2:1994).

[0065] An outdoor aging experiment was carried out in Guangzhou on polypropylene tensile splines. The polypropylene tensile splines were placed on an aging exposure frame facing south at a 45° angle, and the two ends of the splines were clamped by ...

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Abstract

The invention relates to a method for predicting the aging failure rule and the service life of a polymer material under multiple environmental factors, belonging to the field of high polymer materials. According to the method, a lifetime characteristic index-aging time curve of the polymer material under an acceleration condition is obtained based on an accelerated aging test under the multiple environmental factors, corresponding aging failure acceleration factors are calculated by virtue of an Arrhenius formula, a reciprocity method and a superposition rule, an aging failure curve in a normal service environment (with multiple aging factors) is extrapolated from the failure curve under the acceleration condition by virtue of the aging failure acceleration factors, and the aging failure rule of the polymer material is predicted. The method has the beneficial effects of short test cycle, good repeatability, simplicity in theoretical derivation and high prediction reliability.

Description

technical field [0001] The invention relates to a method for predicting the aging failure law and service life of polymer materials under multiple environmental factors, and belongs to the field of polymer materials. Background technique [0002] Polymer materials are prone to degradation in long-term service environments, including single or simultaneous photochemical degradation, oxidative degradation, and hydrolysis. Such a degradation process will cause significant physical or chemical structural changes in the material, which will eventually lead to the failure of the material's performance. Therefore, as polymers, polymer blends and composites are more and more used as structural materials in daily life and industrial fields, the prediction of their long-term service life becomes very necessary. [0003] However, the real long-term service environmental aging test is usually time-consuming and consumes a lot of manpower and financial resources, which makes it impracti...

Claims

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Application Information

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IPC IPC(8): G01N33/00
Inventor 黄亚江吕亚栋杨其李光宪
Owner SICHUAN UNIV
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