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Method for evaluating outdoor service life of coating

A kind of coating and outdoor technology, applied in the direction of mechanical devices, instruments, measuring devices, etc., can solve the problems of incompatibility, long test cycle, years or even decades, etc., to achieve perfect theoretical basis and means, and accurate results , data to obtain accurate results

Pending Publication Date: 2022-07-05
SUZHOU NUCLEAR POWER RES INST +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Natural aging test refers to direct exposure to the natural environment, which can truly reflect the environmental conditions that the material is subjected to, and the test results obtained are accurate and reliable, but the test cycle is long, often requiring several years or even decades of test cycles; The artificial climate accelerated aging test uses the experimental box to simulate the effect of the natural environment. Through the accelerated aging test, the test results can be obtained in a short period of time, but it often cannot correspond to the actual use environment and cannot accurately reflect all environmental factors. influences

Method used

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  • Method for evaluating outdoor service life of coating
  • Method for evaluating outdoor service life of coating
  • Method for evaluating outdoor service life of coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] This example is a coating A' based on an outdoor steel plate in area A. Both parties agreed that the adhesion of the coating should not be lower than 3.5MPa, and the service life of the coating should be evaluated.

[0076] Step 1: Calculate the UV radiation equivalent in the UV accelerated aging test

[0077] The UV irradiation power is 0.60W / m 2 UV aging box for UV aging. Query the monthly ultraviolet radiation UV of region A in the past year i , and calculate the equivalent UV accelerated aging time t per month by formula (1) UVi , the results are shown in Table 2:

[0078]

[0079] Step 2: Calculate the humidity aging equivalent in the damp heat accelerated aging test

[0080] according to figure 1 After the process is verified and corrected by experiments, the equivalent accelerated aging parameter C=87.2. Query the average temperature T of each month in area A in the past year i and average humidity And according to formula (2), calculate the correspon...

Embodiment 2

[0098] This example is an exterior concrete-based exterior wall coating B' in area B. Both parties agreed that the coating adhesion should not be lower than 2MPa, and the service life of the coating should be evaluated.

[0099] Step 1: Calculate the UV radiation equivalent in the UV accelerated aging test

[0100] The UV irradiation power is 0.60W / m 2 UV aging box for UV aging. Query the monthly ultraviolet radiation UV in region A in the past year i , and calculate the equivalent UV accelerated aging time t per month by formula (1) UVi , the results are shown in Table 5:

[0101]

[0102]

[0103] Step 2: Calculate the humidity aging equivalent in the damp heat accelerated aging test

[0104] according to figure 1 After the process is verified and corrected by experiments, the equivalent accelerated aging parameter C=75.8. Query the average temperature T of each month in area B in the past year i and average humidity And according to formula (2), calculate the c...

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Abstract

The invention discloses a method for evaluating the outdoor service life of a coating. The method comprises the following steps: calculating the ultraviolet irradiation equivalent of the coating in ultraviolet aging and the temperature and humidity aging equivalent of the coating in damp and hot accelerated aging in each month of twelve months in one year; accelerated aging test conditions are set according to the ultraviolet light irradiation equivalent and the temperature and humidity aging equivalent of each month, a year is taken as a cycle unit, each month is taken as a stage, and each cycle unit year comprises twelve stages; the adhesive force of the coating is measured after aging of each circulating unit is finished, data fitting is conducted on the test result of the adhesive force, and then the service life of the outdoor coating in failure is obtained. According to the method for evaluating the outdoor service life of the coating, the method for evaluating the service life of the outdoor coating is established, the theoretical basis and means of coating evaluation are perfected, data are obtained accurately, and the result is accurate.

Description

technical field [0001] The invention relates to the technical field of coating evaluation in reliability engineering, in particular to a method for evaluating the service life of outdoor coatings. Background technique [0002] After the coating is applied to the surface of the object, it is dried and hardened, and a tough and elastic covering layer, that is, the coating, is formed on the surface of the object to protect and decorate the object. The coating used for outdoor is exposed to the outdoor atmospheric environment and is subject to the effects of wind, sun, rain, salt spray corrosion, cold and heat changes, etc. Under the long-term repeated action of these external natural environments, the coating is prone to cracking , chalking, peeling and discoloration and other aging phenomena make the coating lose its original decorative and protective functions. Therefore, in engineering applications, in the design and selection stage, it is necessary to conduct an aging test...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N17/00G01N19/04
CPCG01N17/004G01N17/00G01N19/04
Inventor 方可伟刘洪群申罡林金旭王力罗坤杰李成涛
Owner SUZHOU NUCLEAR POWER RES INST