The heat resistance test method of the paint film is as follows:
(1) Prepare the paint film model first, and prepare according to the relevant requirements of "Paint Film Preparation Method". Ensure that the surface of the paint film is smooth and smooth, free from defects such as pitting and pinholes, and minimize fingerprints.
(2) Test equipment: use temperature and humidity control box.
(3) Test conditions:
Test temperature: 47±1·c
Relative humidity: 95%~100%
Test cycle: every 24 hours as a cycle, and check once, continuous test until the board is broken.
Test water: distilled water or deionized water.
Sample hanging position: The samples are hung vertically, the samples do not overlap and touch each other, and the positions should be exchanged during the inspection.
During the test, special attention should be paid to the control of temperature and humidity, the most important influencing factors.